Predicting Columns in a Table - In Depth¶

Tip: If you are new to AutoGluon, review Predicting Columns in a Table - Quick Start to learn the basics of the AutoGluon API. To learn how to add your own custom models to the set that AutoGluon trains, tunes, and ensembles, review Adding a custom model to AutoGluon.

This tutorial describes how you can exert greater control when using AutoGluon’s fit() or predict(). Recall that to maximize predictive performance, you should first try TabularPredictor() and fit() with all default arguments. Then, consider non-default arguments for TabularPredictor(eval_metric=...), and fit(presets=...). Later, you can experiment with other arguments to fit() covered in this in-depth tutorial like hyperparameter_tune_kwargs, hyperparameters, num_stack_levels, num_bag_folds, num_bag_sets, etc.

Using the same census data table as in the Predicting Columns in a Table - Quick Start tutorial, we’ll now predict the occupation of an individual - a multiclass classification problem. Start by importing AutoGluon’s TabularPredictor and TabularDataset, and loading the data.

from autogluon.tabular import TabularDataset, TabularPredictor

import numpy as np

train_data = TabularDataset('https://autogluon.s3.amazonaws.com/datasets/Inc/train.csv')
subsample_size = 500  # subsample subset of data for faster demo, try setting this to much larger values
train_data = train_data.sample(n=subsample_size, random_state=0)
print(train_data.head())

label = 'occupation'
print("Summary of occupation column: \n", train_data['occupation'].describe())

new_data = TabularDataset('https://autogluon.s3.amazonaws.com/datasets/Inc/test.csv')
test_data = new_data[5000:].copy()  # this should be separate data in your applications
y_test = test_data[label]
test_data_nolabel = test_data.drop(columns=[label])  # delete label column
val_data = new_data[:5000].copy()

metric = 'accuracy' # we specify eval-metric just for demo (unnecessary as it's the default)

       age workclass  fnlwgt      education  education-num  6118    51   Private   39264   Some-college             10
23204   58   Private   51662           10th              6
29590   40   Private  326310   Some-college             10
18116   37   Private  222450        HS-grad              9
33964   62   Private  109190      Bachelors             13

            marital-status        occupation    relationship    race      sex  6118    Married-civ-spouse   Exec-managerial            Wife   White   Female
23204   Married-civ-spouse     Other-service            Wife   White   Female
29590   Married-civ-spouse      Craft-repair         Husband   White     Male
18116        Never-married             Sales   Not-in-family   White     Male
33964   Married-civ-spouse   Exec-managerial         Husband   White     Male

       capital-gain  capital-loss  hours-per-week  native-country   class
6118              0             0              40   United-States    >50K
23204             0             0               8   United-States   <=50K
29590             0             0              44   United-States   <=50K
18116             0          2339              40     El-Salvador   <=50K
33964         15024             0              40   United-States    >50K
Summary of occupation column:
 count                  500
unique                  15
top        Exec-managerial
freq                    77
Name: occupation, dtype: object

Specifying hyperparameters and tuning them¶

We first demonstrate hyperparameter-tuning and how you can provide your own validation dataset that AutoGluon internally relies on to: tune hyperparameters, early-stop iterative training, and construct model ensembles. One reason you may specify validation data is when future test data will stem from a different distribution than training data (and your specified validation data is more representative of the future data that will likely be encountered).

If you don’t have a strong reason to provide your own validation dataset, we recommend you omit the tuning_data argument. This lets AutoGluon automatically select validation data from your provided training set (it uses smart strategies such as stratified sampling). For greater control, you can specify the holdout_frac argument to tell AutoGluon what fraction of the provided training data to hold out for validation.

Caution: Since AutoGluon tunes internal knobs based on this validation data, performance estimates reported on this data may be over-optimistic. For unbiased performance estimates, you should always call predict() on a separate dataset (that was never passed to fit()), as we did in the previous Quick-Start tutorial. We also emphasize that most options specified in this tutorial are chosen to minimize runtime for the purposes of demonstration and you should select more reasonable values in order to obtain high-quality models.

fit() trains neural networks and various types of tree ensembles by default. You can specify various hyperparameter values for each type of model. For each hyperparameter, you can either specify a single fixed value, or a search space of values to consider during hyperparameter optimization. Hyperparameters which you do not specify are left at default settings chosen automatically by AutoGluon, which may be fixed values or search spaces.

import autogluon.core as ag

nn_options = {  # specifies non-default hyperparameter values for neural network models
    'num_epochs': 10,  # number of training epochs (controls training time of NN models)
    'learning_rate': ag.space.Real(1e-4, 1e-2, default=5e-4, log=True),  # learning rate used in training (real-valued hyperparameter searched on log-scale)
    'activation': ag.space.Categorical('relu', 'softrelu', 'tanh'),  # activation function used in NN (categorical hyperparameter, default = first entry)
    'dropout_prob': ag.space.Real(0.0, 0.5, default=0.1),  # dropout probability (real-valued hyperparameter)
}

gbm_options = {  # specifies non-default hyperparameter values for lightGBM gradient boosted trees
    'num_boost_round': 100,  # number of boosting rounds (controls training time of GBM models)
    'num_leaves': ag.space.Int(lower=26, upper=66, default=36),  # number of leaves in trees (integer hyperparameter)
}

hyperparameters = {  # hyperparameters of each model type
                   'GBM': gbm_options,
                   'NN_TORCH': nn_options,  # NOTE: comment this line out if you get errors on Mac OSX
                  }  # When these keys are missing from hyperparameters dict, no models of that type are trained

time_limit = 2*60  # train various models for ~2 min
num_trials = 5  # try at most 5 different hyperparameter configurations for each type of model
search_strategy = 'auto'  # to tune hyperparameters using random search routine with a local scheduler

hyperparameter_tune_kwargs = {  # HPO is not performed unless hyperparameter_tune_kwargs is specified
    'num_trials': num_trials,
    'scheduler' : 'local',
    'searcher': search_strategy,
}

predictor = TabularPredictor(label=label, eval_metric=metric).fit(
    train_data, tuning_data=val_data, time_limit=time_limit,
    hyperparameters=hyperparameters, hyperparameter_tune_kwargs=hyperparameter_tune_kwargs,
)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_052512/"
Warning: hyperparameter tuning is currently experimental and may cause the process to hang.
Beginning AutoGluon training ... Time limit = 120s
AutoGluon will save models to "AutogluonModels/ag-20220521_052512/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Tuning Data Rows:    5000
Tuning Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    22363.34 MB
    Train Data (Original)  Memory Usage: 3.11 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.3 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.12s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Fitting 2 L1 models ...
Hyperparameter tuning model: LightGBM ... Tuning model for up to 53.95s of the 119.88s of remaining time.

  0%|          | 0/5 [00:00<?, ?it/s]

Fitted model: LightGBM/T1 ...
3033   = Validation score   (accuracy)
09s    = Training   runtime
04s    = Validation runtime
Fitted model: LightGBM/T2 ...
2899   = Validation score   (accuracy)
82s    = Training   runtime
03s    = Validation runtime
Fitted model: LightGBM/T3 ...
3238   = Validation score   (accuracy)
36s    = Training   runtime
02s    = Validation runtime
Fitted model: LightGBM/T4 ...
2809   = Validation score   (accuracy)
72s    = Training   runtime
09s    = Validation runtime
Fitted model: LightGBM/T5 ...
3108   = Validation score   (accuracy)
51s    = Training   runtime
02s    = Validation runtime
Hyperparameter tuning model: NeuralNetTorch ... Tuning model for up to 53.95s of the 115.96s of remaining time.

  0%|          | 0/5 [00:00<?, ?it/s]

Fitted model: NeuralNetTorch/T1 ...
    0.269    = Validation score   (accuracy)
    1.89s    = Training   runtime
    0.07s    = Validation runtime
Fitted model: NeuralNetTorch/T2 ...
    0.3168   = Validation score   (accuracy)
    0.86s    = Training   runtime
    0.06s    = Validation runtime
Fitted model: NeuralNetTorch/T3 ...
    0.2983   = Validation score   (accuracy)
    0.99s    = Training   runtime
    0.07s    = Validation runtime
Fitted model: NeuralNetTorch/T4 ...
    0.3371   = Validation score   (accuracy)
    0.99s    = Training   runtime
    0.07s    = Validation runtime
Fitted model: NeuralNetTorch/T5 ...
    0.3258   = Validation score   (accuracy)
    1.14s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: WeightedEnsemble_L2 ... Training model for up to 119.88s of the 108.88s of remaining time.
    0.3562   = Validation score   (accuracy)
    1.39s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 12.53s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_052512/")

We again demonstrate how to use the trained models to predict on the test data.

y_pred = predictor.predict(test_data_nolabel)
print("Predictions:  ", list(y_pred)[:5])
perf = predictor.evaluate(test_data, auxiliary_metrics=False)

Predictions:   [' Exec-managerial', ' Exec-managerial', ' Craft-repair', ' Other-service', ' Adm-clerical']

Evaluation: accuracy on test data: 0.3399035437198574
Evaluations on test data:
{
    "accuracy": 0.3399035437198574
}

Use the following to view a summary of what happened during fit(). Now this command will show details of the hyperparameter-tuning process for each type of model:

results = predictor.fit_summary(show_plot=True)

* Summary of fit() *
Estimated performance of each model:
                  model  score_val  pred_time_val  fit_time  pred_time_val_marginal  fit_time_marginal  stack_level  can_infer  fit_order
0   WeightedEnsemble_L2   0.356162       0.474026  9.295646                0.000977           1.390549            2       True         11
1     NeuralNetTorch/T4   0.337092       0.068115  0.986360                0.068115           0.986360            1       True          9
2     NeuralNetTorch/T5   0.325815       0.072197  1.138023                0.072197           1.138023            1       True         10
3           LightGBM/T3   0.323765       0.017362  0.356589                0.017362           0.356589            1       True          3
4     NeuralNetTorch/T2   0.316793       0.057035  0.860177                0.057035           0.860177            1       True          7
5           LightGBM/T5   0.310847       0.019453  0.509984                0.019453           0.509984            1       True          5
6           LightGBM/T1   0.303260       0.040293  1.090349                0.040293           1.090349            1       True          1
7     NeuralNetTorch/T3   0.298339       0.070527  0.992914                0.070527           0.992914            1       True          8
8           LightGBM/T2   0.289932       0.030562  0.815022                0.030562           0.815022            1       True          2
9           LightGBM/T4   0.280910       0.088437  0.716677                0.088437           0.716677            1       True          4
10    NeuralNetTorch/T1   0.269018       0.066723  1.885940                0.066723           1.885940            1       True          6
Number of models trained: 11
Types of models trained:
{'WeightedEnsembleModel', 'TabularNeuralNetTorchModel', 'LGBModel'}
Bagging used: False
Multi-layer stack-ensembling used: False
Feature Metadata (Processed):
(raw dtype, special dtypes):
('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
('int', ['bool']) : 2 | ['sex', 'class']
* End of fit() summary *

/var/lib/jenkins/workspace/workspace/autogluon-tutorial-tabular-v3/core/src/autogluon/core/utils/plots.py:138: UserWarning: AutoGluon summary plots cannot be created because bokeh is not installed. To see plots, please do: "pip install bokeh==2.0.1"
  warnings.warn('AutoGluon summary plots cannot be created because bokeh is not installed. To see plots, please do: "pip install bokeh==2.0.1"')

In the above example, the predictive performance may be poor because we specified very little training to ensure quick runtimes. You can call fit() multiple times while modifying the above settings to better understand how these choices affect performance outcomes. For example: you can comment out the train_data.head command or increase subsample_size to train using a larger dataset, increase the num_epochs and num_boost_round hyperparameters, and increase the time_limit (which you should do for all code in these tutorials). To see more detailed output during the execution of fit(), you can also pass in the argument: verbosity = 3.

Model ensembling with stacking/bagging¶

Beyond hyperparameter-tuning with a correctly-specified evaluation metric, two other methods to boost predictive performance are bagging and stack-ensembling. You’ll often see performance improve if you specify num_bag_folds = 5-10, num_stack_levels = 1-3 in the call to fit(), but this will increase training times and memory/disk usage.

predictor = TabularPredictor(label=label, eval_metric=metric).fit(train_data,
    num_bag_folds=5, num_bag_sets=1, num_stack_levels=1,
    hyperparameters = {'NN_TORCH': {'num_epochs': 2}, 'GBM': {'num_boost_round': 20}},  # last  argument is just for quick demo here, omit it in real applications
)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_052526/"
Beginning AutoGluon training ...
AutoGluon will save models to "AutogluonModels/ag-20220521_052526/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    22185.85 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.08s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
AutoGluon will fit 2 stack levels (L1 to L2) ...
Fitting 2 L1 models ...
Fitting model: LightGBM_BAG_L1 ...
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3067   = Validation score   (accuracy)
    0.99s    = Training   runtime
    0.03s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ...
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1431   = Validation score   (accuracy)
    1.86s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: WeightedEnsemble_L2 ...
    0.3067   = Validation score   (accuracy)
    0.14s    = Training   runtime
    0.0s     = Validation runtime
Fitting 2 L2 models ...
Fitting model: LightGBM_BAG_L2 ...
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.2822   = Validation score   (accuracy)
    2.3s     = Training   runtime
    0.04s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L2 ...
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1534   = Validation score   (accuracy)
    2.11s    = Training   runtime
    0.09s    = Validation runtime
Fitting model: WeightedEnsemble_L3 ...
    0.2822   = Validation score   (accuracy)
    0.14s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 12.3s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_052526/")

You should not provide tuning_data when stacking/bagging, and instead provide all your available data as train_data (which AutoGluon will split in more intellgent ways). num_bag_sets controls how many times the k-fold bagging process is repeated to further reduce variance (increasing this may further boost accuracy but will substantially increase training times, inference latency, and memory/disk usage). Rather than manually searching for good bagging/stacking values yourself, AutoGluon will automatically select good values for you if you specify auto_stack instead:

save_path = 'agModels-predictOccupation'  # folder where to store trained models

predictor = TabularPredictor(label=label, eval_metric=metric, path=save_path).fit(
    train_data, auto_stack=True,
    time_limit=30, hyperparameters={'NN_TORCH': {'num_epochs': 2}, 'GBM': {'num_boost_round': 20}}  # last 2 arguments are for quick demo, omit them in real applications
)

Beginning AutoGluon training ... Time limit = 30s
AutoGluon will save models to "agModels-predictOccupation/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    21168.93 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.13s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Fitting 2 L1 models ...
Fitting model: LightGBM_BAG_L1 ... Training model for up to 29.87s of the 29.87s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3067   = Validation score   (accuracy)
    2.16s    = Training   runtime
    0.03s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ... Training model for up to 27.38s of the 27.38s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1431   = Validation score   (accuracy)
    2.1s     = Training   runtime
    0.07s    = Validation runtime
Repeating k-fold bagging: 2/20
Fitting model: LightGBM_BAG_L1 ... Training model for up to 24.96s of the 24.96s of remaining time.
    Fitting 5 child models (S2F1 - S2F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3149   = Validation score   (accuracy)
    4.38s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ... Training model for up to 22.42s of the 22.42s of remaining time.
    Fitting 5 child models (S2F1 - S2F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1513   = Validation score   (accuracy)
    4.19s    = Training   runtime
    0.13s    = Validation runtime
Repeating k-fold bagging: 3/20
Fitting model: LightGBM_BAG_L1 ... Training model for up to 20.02s of the 20.02s of remaining time.
    Fitting 5 child models (S3F1 - S3F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3292   = Validation score   (accuracy)
    6.58s    = Training   runtime
    0.1s     = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ... Training model for up to 17.5s of the 17.5s of remaining time.
    Fitting 5 child models (S3F1 - S3F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1493   = Validation score   (accuracy)
    6.32s    = Training   runtime
    0.2s     = Validation runtime
Repeating k-fold bagging: 4/20
Fitting model: LightGBM_BAG_L1 ... Training model for up to 15.03s of the 15.03s of remaining time.
    Fitting 5 child models (S4F1 - S4F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3129   = Validation score   (accuracy)
    8.74s    = Training   runtime
    0.13s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ... Training model for up to 12.48s of the 12.48s of remaining time.
    Fitting 5 child models (S4F1 - S4F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1452   = Validation score   (accuracy)
    8.45s    = Training   runtime
    0.26s    = Validation runtime
Repeating k-fold bagging: 5/20
Fitting model: LightGBM_BAG_L1 ... Training model for up to 10.02s of the 10.02s of remaining time.
    Fitting 5 child models (S5F1 - S5F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3108   = Validation score   (accuracy)
    10.93s   = Training   runtime
    0.16s    = Validation runtime
Fitting model: NeuralNetTorch_BAG_L1 ... Training model for up to 7.47s of the 7.47s of remaining time.
    Fitting 5 child models (S5F1 - S5F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.1554   = Validation score   (accuracy)
    10.6s    = Training   runtime
    0.32s    = Validation runtime
Completed 5/20 k-fold bagging repeats ...
Fitting model: WeightedEnsemble_L2 ... Training model for up to 29.87s of the 5.03s of remaining time.
    0.3129   = Validation score   (accuracy)
    0.19s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 25.18s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("agModels-predictOccupation/")

Often stacking/bagging will produce superior accuracy than hyperparameter-tuning, but you may try combining both techniques (note: specifying presets='best_quality' in fit() simply sets auto_stack=True).

Prediction options (inference)¶

Even if you’ve started a new Python session since last calling fit(), you can still load a previously trained predictor from disk:

predictor = TabularPredictor.load(save_path)  # `predictor.path` is another way to get the relative path needed to later load predictor.

Above save_path is the same folder previously passed to TabularPredictor, in which all the trained models have been saved. You can train easily models on one machine and deploy them on another. Simply copy the save_path folder to the new machine and specify its new path in TabularPredictor.load().

To find out the required feature columns to make predictions, call predictor.features():

predictor.features()

['age',
 'workclass',
 'fnlwgt',
 'education',
 'education-num',
 'marital-status',
 'relationship',
 'race',
 'sex',
 'capital-gain',
 'capital-loss',
 'hours-per-week',
 'native-country',
 'class']

We can make a prediction on an individual example rather than a full dataset:

datapoint = test_data_nolabel.iloc[[0]]  # Note: .iloc[0] won't work because it returns pandas Series instead of DataFrame
print(datapoint)
predictor.predict(datapoint)

      age workclass  fnlwgt      education  education-num marital-status  5000   49   Private  259087   Some-college             10       Divorced

        relationship    race      sex  capital-gain  capital-loss  5000   Not-in-family   White   Female             0             0

      hours-per-week  native-country   class
5000              40   United-States   <=50K

5000     Exec-managerial
Name: occupation, dtype: object

To output predicted class probabilities instead of predicted classes, you can use:

predictor.predict_proba(datapoint)  # returns a DataFrame that shows which probability corresponds to which class

	?	Adm-clerical	Armed-Forces	Craft-repair	Exec-managerial	Farming-fishing	Handlers-cleaners	Machine-op-inspct	Other-service	Priv-house-serv	Prof-specialty	Protective-serv	Sales	Tech-support	Transport-moving
5000	0.055114	0.124561	0.0	0.114383	0.163282	0.04623	0.056451	0.064719	0.074039	0.0	0.088531	0.0	0.100172	0.042818	0.069699

By default, predict() and predict_proba() will utilize the model that AutoGluon thinks is most accurate, which is usually an ensemble of many individual models. Here’s how to see which model this is:

predictor.get_model_best()

'WeightedEnsemble_L2'

We can instead specify a particular model to use for predictions (e.g. to reduce inference latency). Note that a ‘model’ in AutoGluon may refer to, for example, a single Neural Network, a bagged ensemble of many Neural Network copies trained on different training/validation splits, a weighted ensemble that aggregates the predictions of many other models, or a stacker model that operates on predictions output by other models. This is akin to viewing a Random Forest as one ‘model’ when it is in fact an ensemble of many decision trees.

Before deciding which model to use, let’s evaluate all of the models AutoGluon has previously trained on our test data:

predictor.leaderboard(test_data, silent=True)

	model	score_test	score_val	pred_time_test	pred_time_val	fit_time	pred_time_test_marginal	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	LightGBM_BAG_L1	0.283288	0.310838	0.372887	0.164110	10.933773	0.372887	0.164110	10.933773	1	True	1
1	WeightedEnsemble_L2	0.280981	0.312883	2.196561	0.482128	21.723421	0.002594	0.000619	0.194097	2	True	3
2	NeuralNetTorch_BAG_L1	0.140071	0.155419	1.821079	0.317399	10.595550	1.821079	0.317399	10.595550	1	True	2

The leaderboard shows each model’s predictive performance on the test data (score_test) and validation data (score_val), as well as the time required to: produce predictions for the test data (pred_time_val), produce predictions on the validation data (pred_time_val), and train only this model (fit_time). Below, we show that a leaderboard can be produced without new data (just uses the data previously reserved for validation inside fit) and can display extra information about each model:

predictor.leaderboard(extra_info=True, silent=True)

	model	score_val	pred_time_val	fit_time	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order	num_features	...	child_model_type	hyperparameters	hyperparameters_fit	ag_args_fit	features	child_hyperparameters	child_hyperparameters_fit	child_ag_args_fit	ancestors	descendants
0	WeightedEnsemble_L2	0.312883	0.482128	21.723421	0.000619	0.194097	2	True	3	24	...	GreedyWeightedEnsembleModel	{'use_orig_features': False, 'max_base_models'...	{}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[LightGBM_BAG_L1_0, NeuralNetTorch_BAG_L1_11, ...	{'ensemble_size': 100}	{'ensemble_size': 2}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[LightGBM_BAG_L1, NeuralNetTorch_BAG_L1]	[]
1	LightGBM_BAG_L1	0.310838	0.164110	10.933773	0.164110	10.933773	1	True	1	14	...	LGBModel	{'use_orig_features': True, 'max_base_models':...	{}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[education-num, fnlwgt, sex, workclass, marita...	{'learning_rate': 0.05, 'num_boost_round': 20}	{'num_boost_round': 12}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[]	[WeightedEnsemble_L2]
2	NeuralNetTorch_BAG_L1	0.155419	0.317399	10.595550	0.317399	10.595550	1	True	2	14	...	TabularNeuralNetTorchModel	{'use_orig_features': True, 'max_base_models':...	{}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[education-num, fnlwgt, sex, workclass, marita...	{'num_epochs': 2, 'epochs_wo_improve': 20, 'ac...	{'batch_size': 32, 'num_epochs': 2}	{'max_memory_usage_ratio': 1.0, 'max_time_limi...	[]	[WeightedEnsemble_L2]

3 rows × 29 columns

The expanded leaderboard shows properties like how many features are used by each model (num_features), which other models are ancestors whose predictions are required inputs for each model (ancestors), and how much memory each model and all its ancestors would occupy if simultaneously persisted (memory_size_w_ancestors). See the leaderboard documentation for full details.

To show scores for other metrics, you can specify the extra_metrics argument when passing in test_data:

predictor.leaderboard(test_data, extra_metrics=['accuracy', 'balanced_accuracy', 'log_loss'], silent=True)

	model	score_test	accuracy	balanced_accuracy	log_loss	score_val	pred_time_test	pred_time_val	fit_time	pred_time_test_marginal	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	LightGBM_BAG_L1	0.283288	0.283288	0.177224	-11.747300	0.310838	0.370258	0.164110	10.933773	0.370258	0.164110	10.933773	1	True	1
1	WeightedEnsemble_L2	0.280981	0.280981	0.173373	-11.716677	0.312883	2.383932	0.482128	21.723421	0.002711	0.000619	0.194097	2	True	3
2	NeuralNetTorch_BAG_L1	0.140071	0.140071	0.075595	-11.749016	0.155419	2.010963	0.317399	10.595550	2.010963	0.317399	10.595550	1	True	2

Notice that log_loss scores are negative. This is because metrics in AutoGluon are always shown in higher_is_better form. This means that metrics such as log_loss and root_mean_squared_error will have their signs FLIPPED, and values will be negative. This is necessary to avoid the user needing to know the metric to understand if higher is better when looking at leaderboard.

One additional caveat: It is possible that log_loss values can be -inf when computed via extra_metrics. This is because the models were not optimized with log_loss in mind during training and may have prediction probabilities giving a class 0 (particularly common with K-Nearest-Neighbors models). Because log_loss gives infinite error when the correct class was given 0 probability, this results in a score of -inf. It is therefore recommended that log_loss should not be used as a secondary metric to determine model quality. Either use log_loss as the eval_metric or avoid it altogether.

Here’s how to specify a particular model to use for prediction instead of AutoGluon’s default model-choice:

i = 0  # index of model to use
model_to_use = predictor.get_model_names()[i]
model_pred = predictor.predict(datapoint, model=model_to_use)
print("Prediction from %s model: %s" % (model_to_use, model_pred.iloc[0]))

Prediction from LightGBM_BAG_L1 model:  Exec-managerial

We can easily access various information about the trained predictor or a particular model:

all_models = predictor.get_model_names()
model_to_use = all_models[i]
specific_model = predictor._trainer.load_model(model_to_use)

# Objects defined below are dicts of various information (not printed here as they are quite large):
model_info = specific_model.get_info()
predictor_information = predictor.info()

The predictor also remembers what metric predictions should be evaluated with, which can be done with ground truth labels as follows:

y_pred_proba = predictor.predict_proba(test_data_nolabel)
perf = predictor.evaluate_predictions(y_true=y_test, y_pred=y_pred_proba)

Evaluation: accuracy on test data: 0.28098133780666806
Evaluations on test data:
{
    "accuracy": 0.28098133780666806,
    "balanced_accuracy": 0.17337271708975696,
    "mcc": 0.18863126671102973
}

Since the label columns remains in the test_data DataFrame, we can instead use the shorthand:

perf = predictor.evaluate(test_data)

Evaluation: accuracy on test data: 0.28098133780666806
Evaluations on test data:
{
    "accuracy": 0.28098133780666806,
    "balanced_accuracy": 0.17337271708975696,
    "mcc": 0.18863126671102973
}

Interpretability (feature importance)¶

To better understand our trained predictor, we can estimate the overall importance of each feature:

predictor.feature_importance(test_data)

Computing feature importance via permutation shuffling for 14 features using 4637 rows with 5 shuffle sets...
    180.34s = Expected runtime (36.07s per shuffle set)
    129.75s = Actual runtime (Completed 5 of 5 shuffle sets)

	importance	stddev	p_value	n	p99_high	p99_low
education-num	0.065085	0.002738	3.749819e-07	5	0.070723	0.059447
sex	0.036230	0.001455	3.111960e-07	5	0.039226	0.033235
workclass	0.034462	0.001573	5.193881e-07	5	0.037701	0.031223
hours-per-week	0.031615	0.005240	8.730744e-05	5	0.042404	0.020827
age	0.020401	0.003693	1.234517e-04	5	0.028006	0.012796
class	0.006642	0.002801	3.038512e-03	5	0.012410	0.000875
fnlwgt	0.001121	0.001996	1.387326e-01	5	0.005232	-0.002989
education	0.001035	0.000920	3.282207e-02	5	0.002929	-0.000859
relationship	0.000518	0.000772	1.040000e-01	5	0.002106	-0.001071
marital-status	0.000388	0.000354	3.524200e-02	5	0.001118	-0.000341
native-country	0.000216	0.000152	1.705471e-02	5	0.000530	-0.000098
capital-loss	0.000173	0.000492	2.383103e-01	5	0.001185	-0.000840
race	-0.000129	0.000118	9.647580e-01	5	0.000114	-0.000373
capital-gain	-0.000733	0.000816	9.426308e-01	5	0.000946	-0.002412

Computed via permutation-shuffling, these feature importance scores quantify the drop in predictive performance (of the already trained predictor) when one column’s values are randomly shuffled across rows. The top features in this list contribute most to AutoGluon’s accuracy (for predicting when/if a patient will be readmitted to the hospital). Features with non-positive importance score hardly contribute to the predictor’s accuracy, or may even be actively harmful to include in the data (consider removing these features from your data and calling fit again). These scores facilitate interpretability of the predictor’s global behavior (which features it relies on for all predictions). To get local explanations regarding which features influence a particular prediction, check out the example notebooks for explaining particular AutoGluon predictions using Shapely values.

Accelerating inference¶

We describe multiple ways to reduce the time it takes for AutoGluon to produce predictions.

Before providing code examples, it is important to understand that there are several ways to accelerate inference in AutoGluon. The table below lists the options in order of priority.

Optimiz ation	Inference Speedup	Cost	Notes
refit_ full	At least 8x+, up to 160x (requires bagging)	-Qualit y, +FitTim e	Only provides speedup with bagging enabled.
persist _model s	Up to 10x in online-inference	++Memor yUsage	If memory is not sufficient to persist model, speedup is not gained. Speedup is most effective in online-inference and is not relevant in batch inference.
infer_ limit	Configurable, ~up to 50x	-Qualit y (Relati ve to speedup )	If bagging is enabled, always use refit_full if using infer_limit.
distill	~Equals combined speedup of refit_full and infer_limit set to extreme values	–Quali ty, ++FitTi me	Not compatible with refit_full and infer_limit.
feature pruning	Typically at most 1.5x. More if willing to lower quality significantly.	-Qualit y?, ++FitTi me	Dependent on the existence of unimportant features in data. Call `predictor.feature_importance(test_ data)` to gauge which features could be removed.
use faster hardwar e	Usually at most 3x. Depends on hardware (ignoring GPU).	+Hardwa re	As an example, an EC2 c6i.2xlarge is ~1.6x faster than an m5.2xlarge for a similar price. Laptops in particular might be slow compared to cloud instances.
manual hyperpa rameter s adjustm ent	Usually at most 2x assuming infer_limit is already specified.	—Qual ity?, +++User MLExper tise	Can be very complicated and is not recommended. Potential ways to get speedups this way is to reduce the number of trees in LightGBM, XGBoost, CatBoost, RandomForest, and ExtraTrees.
manual data preproc essing	Usually at most 1.2x assuming all other optimizations are specified and setting is online-inference.	++++Use rMLExpe rtise, ++++Use rCode	Only relevant for online-inference. This is not recommended as AutoGluon’s default preprocessing is highly optimized.

If bagging is enabled (num_bag_folds>0 or num_stack_levels>0 or
using ‘best_quality’ preset), the order of inference optimizations
should be:
1. refit_full
2. persist_models
3. infer_limit

If bagging is not enabled (num_bag_folds=0, num_stack_levels=0),
the order of inference optimizations should be:
1. persist_models
2. infer_limit

If following these recommendations does not lead to a sufficiently fast model, you may consider the more advanced options in the table.

Keeping models in memory¶

By default, AutoGluon loads models into memory one at a time and only when they are needed for prediction. This strategy is robust for large stacked/bagged ensembles, but leads to slower prediction times. If you plan to repeatedly make predictions (e.g. on new datapoints one at a time rather than one large test dataset), you can first specify that all models required for inference should be loaded into memory as follows:

predictor.persist_models()

num_test = 20
preds = np.array(['']*num_test, dtype='object')
for i in range(num_test):
    datapoint = test_data_nolabel.iloc[[i]]
    pred_numpy = predictor.predict(datapoint, as_pandas=False)
    preds[i] = pred_numpy[0]

perf = predictor.evaluate_predictions(y_test[:num_test], preds, auxiliary_metrics=True)
print("Predictions: ", preds)

predictor.unpersist_models()  # free memory by clearing models, future predict() calls will load models from disk

Persisting 3 models in memory. Models will require 0.06% of memory.
Evaluation: accuracy on test data: 0.25
Evaluations on test data:
{
    "accuracy": 0.25,
    "balanced_accuracy": 0.3208333333333336,
    "mcc": 0.12121844240150972
}
Unpersisted 3 models: ['LightGBM_BAG_L1', 'WeightedEnsemble_L2', 'NeuralNetTorch_BAG_L1']

Predictions:  [' Exec-managerial' ' Craft-repair' ' Craft-repair' ' Adm-clerical'
 ' Sales' ' Exec-managerial' ' Exec-managerial' ' Sales'
 ' Exec-managerial' ' Adm-clerical' ' Other-service' ' Exec-managerial'
 ' Exec-managerial' ' Exec-managerial' ' Adm-clerical' ' ?'
 ' Craft-repair' ' Craft-repair' ' Exec-managerial' ' Craft-repair']

['LightGBM_BAG_L1', 'WeightedEnsemble_L2', 'NeuralNetTorch_BAG_L1']

You can alternatively specify a particular model to persist via the models argument of persist_models(), or simply set models='all' to simultaneously load every single model that was trained during fit.

Inference speed as a fit constraint¶

If you know your latency constraint prior to fitting the predictor, you can specify it explicitly as a fit argument. AutoGluon will then automatically train models in a fashion that attempts to satisfy the constraint.

This constraint has two components: infer_limit and
infer_limit_batch_size:
- infer_limit is the time in seconds to predict 1 row of data. For
example, infer_limit=0.05 means 50 ms per row of data, or 20 rows
/ second throughput.
- infer_limit_batch_size is the amount of rows passed at once to
predict when calculating per-row speed. This is very important because
infer_limit_batch_size=1 (online-inference) is highly suboptimal
as various operations have a fixed cost overhead regardless of data
size. If you can pass your test data in bulk, you should specify
infer_limit_batch_size=10000.

# At most 0.05 ms per row (20000 rows per second throughput)
infer_limit = 0.00005
# adhere to infer_limit with batches of size 10000 (batch-inference, easier to satisfy infer_limit)
infer_limit_batch_size = 10000
# adhere to infer_limit with batches of size 1 (online-inference, much harder to satisfy infer_limit)
# infer_limit_batch_size = 1  # Note that infer_limit<0.02 when infer_limit_batch_size=1 can be difficult to satisfy.
predictor_infer_limit = TabularPredictor(label=label, eval_metric=metric).fit(
    train_data=train_data,
    time_limit=30,
    infer_limit=infer_limit,
    infer_limit_batch_size=infer_limit_batch_size,
)

# NOTE: If bagging was enabled, it is important to call refit_full at this stage.
#  infer_limit assumes that the user will call refit_full after fit.
# predictor_infer_limit.refit_full()

# NOTE: To align with inference speed calculated during fit, models must be persisted.
predictor_infer_limit.persist_models()
# Below is an optimized version that only persists the minimum required models for prediction.
# predictor_infer_limit.persist_models('best')

predictor_infer_limit.leaderboard(silent=True)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_052847/"
Beginning AutoGluon training ... Time limit = 30s
AutoGluon will save models to "AutogluonModels/ag-20220521_052847/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    21846.62 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
    0.0s    = Feature Preprocessing Time (1 row | 10000 batch size)
            Feature Preprocessing requires 3.53% of the overall inference constraint (5e-05s)
            0.0s inference time budget remaining for models...
Data preprocessing and feature engineering runtime = 0.26s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Automatically generating train/validation split with holdout_frac=0.2, Train Rows: 391, Val Rows: 98
Fitting 13 L1 models ...
Fitting model: KNeighborsUnif ... Training model for up to 29.74s of the 29.73s of remaining time.
    0.1633   = Validation score   (accuracy)
    0.03s    = Training   runtime
    0.01s    = Validation runtime
    0.003ms  = Validation runtime (1 row | 10000 batch size)
    0.003ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: KNeighborsDist ... Training model for up to 29.69s of the 29.69s of remaining time.
    0.1224   = Validation score   (accuracy)
    0.03s    = Training   runtime
    0.01s    = Validation runtime
    0.003ms  = Validation runtime (1 row | 10000 batch size)
    0.003ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: NeuralNetFastAI ... Training model for up to 29.65s of the 29.65s of remaining time.
No improvement since epoch 6: early stopping
    0.3265   = Validation score   (accuracy)
    1.01s    = Training   runtime
    0.01s    = Validation runtime
    0.011ms  = Validation runtime (1 row | 10000 batch size)
    0.011ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: LightGBMXT ... Training model for up to 28.62s of the 28.62s of remaining time.
    0.3571   = Validation score   (accuracy)
    0.91s    = Training   runtime
    0.01s    = Validation runtime
    0.008ms  = Validation runtime (1 row | 10000 batch size)
    0.008ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: LightGBM ... Training model for up to 27.68s of the 27.68s of remaining time.
    0.3673   = Validation score   (accuracy)
    1.26s    = Training   runtime
    0.01s    = Validation runtime
    0.004ms  = Validation runtime (1 row | 10000 batch size)
    0.004ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: RandomForestGini ... Training model for up to 26.4s of the 26.4s of remaining time.
    0.3061   = Validation score   (accuracy)
    0.99s    = Training   runtime
    0.08s    = Validation runtime
    0.014ms  = Validation runtime (1 row | 10000 batch size)
    0.014ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: RandomForestEntr ... Training model for up to 25.3s of the 25.3s of remaining time.
    0.3163   = Validation score   (accuracy)
    0.92s    = Training   runtime
    0.07s    = Validation runtime
    0.014ms  = Validation runtime (1 row | 10000 batch size)
    0.014ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: CatBoost ... Training model for up to 24.27s of the 24.27s of remaining time.
    0.3469   = Validation score   (accuracy)
    16.11s   = Training   runtime
    0.01s    = Validation runtime
    0.004ms  = Validation runtime (1 row | 10000 batch size)
    0.004ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: ExtraTreesGini ... Training model for up to 8.14s of the 8.14s of remaining time.
    0.2653   = Validation score   (accuracy)
    0.98s    = Training   runtime
    0.07s    = Validation runtime
    0.014ms  = Validation runtime (1 row | 10000 batch size)
    0.014ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: ExtraTreesEntr ... Training model for up to 7.06s of the 7.05s of remaining time.
    0.3061   = Validation score   (accuracy)
    0.91s    = Training   runtime
    0.08s    = Validation runtime
    0.015ms  = Validation runtime (1 row | 10000 batch size)
    0.015ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: XGBoost ... Training model for up to 6.03s of the 6.02s of remaining time.
    0.398    = Validation score   (accuracy)
    1.19s    = Training   runtime
    0.01s    = Validation runtime
    0.003ms  = Validation runtime (1 row | 10000 batch size)
    0.003ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: NeuralNetTorch ... Training model for up to 4.82s of the 4.82s of remaining time.
    0.3061   = Validation score   (accuracy)
    2.32s    = Training   runtime
    0.01s    = Validation runtime
    0.013ms  = Validation runtime (1 row | 10000 batch size)
    0.013ms  = Validation runtime (1 row | 10000 batch size | FULL)
Fitting model: LightGBMLarge ... Training model for up to 2.49s of the 2.48s of remaining time.
    Ran out of time, early stopping on iteration 160. Best iteration is:
    [5]     valid_set's multi_error: 0.734694
    0.2653   = Validation score   (accuracy)
    2.67s    = Training   runtime
    0.01s    = Validation runtime
    0.002ms  = Validation runtime (1 row | 10000 batch size)
    0.002ms  = Validation runtime (1 row | 10000 batch size | FULL)
Removing 7/13 base models to satisfy inference constraint (constraint=0.0s) ...
    0.0001s -> 0.0001s (KNeighborsDist)
    0.0001s -> 0.0001s (KNeighborsUnif)
    0.0001s -> 0.0001s (ExtraTreesGini)
    0.0001s -> 0.0001s (LightGBMLarge)
    0.0001s -> 0.0001s (RandomForestGini)
    0.0001s -> 0.0001s (ExtraTreesEntr)
    0.0001s -> 0.0s (NeuralNetTorch)
Fitting model: WeightedEnsemble_L2 ... Training model for up to 29.74s of the -0.37s of remaining time.
    0.398    = Validation score   (accuracy)
    0.17s    = Training   runtime
    0.0s     = Validation runtime
    0.0ms    = Validation runtime (1 row | 10000 batch size)
    0.003ms  = Validation runtime (1 row | 10000 batch size | FULL)
AutoGluon training complete, total runtime = 30.56s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_052847/")
Persisting 2 models in memory. Models will require 0.02% of memory.

	model	score_val	pred_time_val	fit_time	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	XGBoost	0.397959	0.006931	1.187299	0.006931	1.187299	1	True	11
1	WeightedEnsemble_L2	0.397959	0.007291	1.355264	0.000360	0.167966	2	True	14
2	LightGBM	0.367347	0.005733	1.258375	0.005733	1.258375	1	True	5
3	LightGBMXT	0.357143	0.007018	0.913968	0.007018	0.913968	1	True	4
4	CatBoost	0.346939	0.007457	16.108397	0.007457	16.108397	1	True	8
5	NeuralNetFastAI	0.326531	0.010825	1.007794	0.010825	1.007794	1	True	3
6	RandomForestEntr	0.316327	0.071511	0.921948	0.071511	0.921948	1	True	7
7	NeuralNetTorch	0.306122	0.011768	2.318939	0.011768	2.318939	1	True	12
8	RandomForestGini	0.306122	0.076546	0.986380	0.076546	0.986380	1	True	6
9	ExtraTreesEntr	0.306122	0.076694	0.913486	0.076694	0.913486	1	True	10
10	LightGBMLarge	0.265306	0.005256	2.667911	0.005256	2.667911	1	True	13
11	ExtraTreesGini	0.265306	0.070182	0.975493	0.070182	0.975493	1	True	9
12	KNeighborsUnif	0.163265	0.006888	0.034700	0.006888	0.034700	1	True	1
13	KNeighborsDist	0.122449	0.006355	0.031199	0.006355	0.031199	1	True	2

Now we can test the inference speed of the final model and check if it satisfies the inference constraints.

test_data_batch = test_data.sample(infer_limit_batch_size, replace=True, ignore_index=True)

import time
time_start = time.time()
predictor_infer_limit.predict(test_data_batch)
time_end = time.time()

infer_time_per_row = (time_end - time_start) / len(test_data_batch)
rows_per_second = 1 / infer_time_per_row
infer_time_per_row_ratio = infer_time_per_row / infer_limit
is_constraint_satisfied = infer_time_per_row_ratio <= 1

print(f'Model is able to predict {round(rows_per_second, 1)} rows per second. (User-specified Throughput = {1 / infer_limit})')
print(f'Model uses {round(infer_time_per_row_ratio * 100, 1)}% of infer_limit time per row.')
print(f'Model satisfies inference constraint: {is_constraint_satisfied}')

Model is able to predict 165268.7 rows per second. (User-specified Throughput = 20000.0)
Model uses 12.1% of infer_limit time per row.
Model satisfies inference constraint: True

Using smaller ensemble or faster model for prediction¶

Without having to retrain any models, one can construct alternative ensembles that aggregate individual models’ predictions with different weighting schemes. These ensembles become smaller (and hence faster for prediction) if they assign nonzero weight to less models. You can produce a wide variety of ensembles with different accuracy-speed tradeoffs like this:

additional_ensembles = predictor.fit_weighted_ensemble(expand_pareto_frontier=True)
print("Alternative ensembles you can use for prediction:", additional_ensembles)

predictor.leaderboard(only_pareto_frontier=True, silent=True)

Fitting model: WeightedEnsemble_L2Best ...
3129   = Validation score   (accuracy)
13s    = Training   runtime
0s     = Validation runtime

Alternative ensembles you can use for prediction: ['WeightedEnsemble_L2Best']

	model	score_val	pred_time_val	fit_time	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	WeightedEnsemble_L2Best	0.312883	0.481979	21.657750	0.000471	0.128426	2	True	4
1	LightGBM_BAG_L1	0.310838	0.164110	10.933773	0.164110	10.933773	1	True	1

The resulting leaderboard will contain the most accurate model for a given inference-latency. You can select whichever model exhibits acceptable latency from the leaderboard and use it for prediction.

model_for_prediction = additional_ensembles[0]
predictions = predictor.predict(test_data, model=model_for_prediction)
predictor.delete_models(models_to_delete=additional_ensembles, dry_run=False)  # delete these extra models so they don't affect rest of tutorial

Deleting model WeightedEnsemble_L2Best. All files under agModels-predictOccupation/models/WeightedEnsemble_L2Best/ will be removed.

Collapsing bagged ensembles via refit_full¶

For an ensemble predictor trained with bagging (as done above), recall there are ~10 bagged copies of each individual model trained on different train/validation folds. We can collapse this bag of ~10 models into a single model that’s fit to the full dataset, which can greatly reduce its memory/latency requirements (but may also reduce accuracy). Below we refit such a model for each original model but you can alternatively do this for just a particular model by specifying the model argument of refit_full().

refit_model_map = predictor.refit_full()
print("Name of each refit-full model corresponding to a previous bagged ensemble:")
print(refit_model_map)
predictor.leaderboard(test_data, silent=True)

Fitting 1 L1 models ...
Fitting model: LightGBM_BAG_L1_FULL ...
    0.17s    = Training   runtime
Fitting 1 L1 models ...
Fitting model: NeuralNetTorch_BAG_L1_FULL ...
    0.15s    = Training   runtime
Fitting model: WeightedEnsemble_L2_FULL | Skipping fit via cloning parent ...
    0.19s    = Training   runtime
Updated best model to "WeightedEnsemble_L2_FULL" (Previously "WeightedEnsemble_L2"). AutoGluon will default to using "WeightedEnsemble_L2_FULL" for predict() and predict_proba().

Name of each refit-full model corresponding to a previous bagged ensemble:
{'LightGBM_BAG_L1': 'LightGBM_BAG_L1_FULL', 'NeuralNetTorch_BAG_L1': 'NeuralNetTorch_BAG_L1_FULL', 'WeightedEnsemble_L2': 'WeightedEnsemble_L2_FULL'}

	model	score_test	score_val	pred_time_test	pred_time_val	fit_time	pred_time_test_marginal	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	LightGBM_BAG_L1	0.283288	0.310838	0.367697	0.164110	10.933773	0.367697	0.164110	10.933773	1	True	1
1	WeightedEnsemble_L2	0.280981	0.312883	2.343848	0.482128	21.723421	0.002780	0.000619	0.194097	2	True	3
2	LightGBM_BAG_L1_FULL	0.269868	NaN	0.018693	NaN	0.167351	0.018693	NaN	0.167351	1	True	4
3	WeightedEnsemble_L2_FULL	0.269868	NaN	0.095125	NaN	0.509570	0.002178	NaN	0.194097	2	True	6
4	NeuralNetTorch_BAG_L1	0.140071	0.155419	1.973371	0.317399	10.595550	1.973371	0.317399	10.595550	1	True	2
5	NeuralNetTorch_BAG_L1_FULL	0.132103	NaN	0.074254	NaN	0.148122	0.074254	NaN	0.148122	1	True	5

This adds the refit-full models to the leaderboard and we can opt to use any of them for prediction just like any other model. Note pred_time_test and pred_time_val list the time taken to produce predictions with each model (in seconds) on the test/validation data. Since the refit-full models were trained using all of the data, there is no internal validation score (score_val) available for them. You can also call refit_full() with non-bagged models to refit the same models to your full dataset (there won’t be memory/latency gains in this case but test accuracy may improve).

Model distillation¶

While computationally-favorable, single individual models will usually have lower accuracy than weighted/stacked/bagged ensembles. Model Distillation offers one way to retain the computational benefits of a single model, while enjoying some of the accuracy-boost that comes with ensembling. The idea is to train the individual model (which we can call the student) to mimic the predictions of the full stack ensemble (the teacher). Like refit_full(), the distill() function will produce additional models we can opt to use for prediction.

student_models = predictor.distill(time_limit=30)  # specify much longer time limit in real applications
print(student_models)
preds_student = predictor.predict(test_data_nolabel, model=student_models[0])
print(f"predictions from {student_models[0]}:", list(preds_student)[:5])
predictor.leaderboard(test_data)

Distilling with teacher='WeightedEnsemble_L2_FULL', teacher_preds=soft, augment_method=spunge ...
SPUNGE: Augmenting training data with 1955 synthetic samples for distillation...
Distilling with each of these student models: ['LightGBM_DSTL', 'NeuralNetMXNet_DSTL', 'RandomForestMSE_DSTL', 'CatBoost_DSTL', 'NeuralNetTorch_DSTL']
Fitting 5 L1 models ...
Fitting model: LightGBM_DSTL ... Training model for up to 30.0s of the 30.0s of remaining time.
    Note: model has different eval_metric than default.
    -1.9886  = Validation score   (soft_log_loss)
    4.46s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: NeuralNetMXNet_DSTL ... Training model for up to 25.42s of the 25.42s of remaining time.
    WARNING: TabularNeuralNetMxnetModel (alias "NN" & "NN_MXNET") has been deprecated in v0.4.0.
            Starting in v0.5.0, calling TabularNeuralNetMxnetModel will raise an exception.
            Consider instead using TabularNeuralNetTorchModel via "NN_TORCH".
    Ran out of time, stopping training early. (Stopping on epoch 22)
    Note: model has different eval_metric than default.
    -2.1455  = Validation score   (soft_log_loss)
    25.24s   = Training   runtime
    0.15s    = Validation runtime
Fitting model: RandomForestMSE_DSTL ... Training model for up to 0.02s of the 0.02s of remaining time.
    Note: model has different eval_metric than default.
    -2.0977  = Validation score   (soft_log_loss)
    1.1s     = Training   runtime
    0.06s    = Validation runtime
Completed 1/20 k-fold bagging repeats ...
Distilling with each of these student models: ['WeightedEnsemble_L2_DSTL']
Fitting model: WeightedEnsemble_L2_DSTL ... Training model for up to 30.0s of the -1.69s of remaining time.
    Note: model has different eval_metric than default.
    -1.9886  = Validation score   (soft_log_loss)
    0.06s    = Training   runtime
    0.0s     = Validation runtime
Distilled model leaderboard:
                      model  score_val  pred_time_val   fit_time  pred_time_val_marginal  fit_time_marginal  stack_level  can_infer  fit_order
0             LightGBM_DSTL   0.387755       0.009906   4.456789                0.009906           4.456789            1       True          7
1  WeightedEnsemble_L2_DSTL   0.387755       0.010363   4.521247                0.000456           0.064459            2       True         10
2       NeuralNetMXNet_DSTL   0.346939       0.154090  25.242688                0.154090          25.242688            1       True          8
3      RandomForestMSE_DSTL   0.306122       0.061716   1.096101                0.061716           1.096101            1       True          9

['LightGBM_DSTL', 'NeuralNetMXNet_DSTL', 'RandomForestMSE_DSTL', 'WeightedEnsemble_L2_DSTL']
predictions from LightGBM_DSTL: [' Exec-managerial', ' Exec-managerial', ' Craft-repair', ' Other-service', ' Craft-repair']
                        model  score_test  score_val  pred_time_test  pred_time_val   fit_time  pred_time_test_marginal  pred_time_val_marginal  fit_time_marginal  stack_level  can_infer  fit_order
       NeuralNetMXNet_DSTL    0.298595   0.346939        1.802055       0.154090  25.242688                 1.802055                0.154090          25.242688            1       True          8
      RandomForestMSE_DSTL    0.293353   0.306122        0.182687       0.061716   1.096101                 0.182687                0.061716           1.096101            1       True          9
             LightGBM_DSTL    0.287691   0.387755        0.241309       0.009906   4.456789                 0.241309                0.009906           4.456789            1       True          7
  WeightedEnsemble_L2_DSTL    0.287691   0.387755        0.242838       0.010363   4.521247                 0.001529                0.000456           0.064459            2       True         10
           LightGBM_BAG_L1    0.283288   0.310838        0.351509       0.164110  10.933773                 0.351509                0.164110          10.933773            1       True          1
       WeightedEnsemble_L2    0.280981   0.312883        2.312552       0.482128  21.723421                 0.008265                0.000619           0.194097            2       True          3
      LightGBM_BAG_L1_FULL    0.269868        NaN        0.014069            NaN   0.167351                 0.014069                     NaN           0.167351            1       True          4
  WeightedEnsemble_L2_FULL    0.269868        NaN        0.088902            NaN   0.509570                 0.002042                     NaN           0.194097            2       True          6
     NeuralNetTorch_BAG_L1    0.140071   0.155419        1.952779       0.317399  10.595550                 1.952779                0.317399          10.595550            1       True          2
NeuralNetTorch_BAG_L1_FULL    0.132103        NaN        0.072791            NaN   0.148122                 0.072791                     NaN           0.148122            1       True          5

	model	score_test	score_val	pred_time_test	pred_time_val	fit_time	pred_time_test_marginal	pred_time_val_marginal	fit_time_marginal	stack_level	can_infer	fit_order
0	NeuralNetMXNet_DSTL	0.298595	0.346939	1.802055	0.154090	25.242688	1.802055	0.154090	25.242688	1	True	8
1	RandomForestMSE_DSTL	0.293353	0.306122	0.182687	0.061716	1.096101	0.182687	0.061716	1.096101	1	True	9
2	LightGBM_DSTL	0.287691	0.387755	0.241309	0.009906	4.456789	0.241309	0.009906	4.456789	1	True	7
3	WeightedEnsemble_L2_DSTL	0.287691	0.387755	0.242838	0.010363	4.521247	0.001529	0.000456	0.064459	2	True	10
4	LightGBM_BAG_L1	0.283288	0.310838	0.351509	0.164110	10.933773	0.351509	0.164110	10.933773	1	True	1
5	WeightedEnsemble_L2	0.280981	0.312883	2.312552	0.482128	21.723421	0.008265	0.000619	0.194097	2	True	3
6	LightGBM_BAG_L1_FULL	0.269868	NaN	0.014069	NaN	0.167351	0.014069	NaN	0.167351	1	True	4
7	WeightedEnsemble_L2_FULL	0.269868	NaN	0.088902	NaN	0.509570	0.002042	NaN	0.194097	2	True	6
8	NeuralNetTorch_BAG_L1	0.140071	0.155419	1.952779	0.317399	10.595550	1.952779	0.317399	10.595550	1	True	2
9	NeuralNetTorch_BAG_L1_FULL	0.132103	NaN	0.072791	NaN	0.148122	0.072791	NaN	0.148122	1	True	5

Faster presets or hyperparameters¶

Instead of trying to speed up a cumbersome trained model at prediction time, if you know inference latency or memory will be an issue at the outset, then you can adjust the training process accordingly to ensure fit() does not produce unwieldy models.

One option is to specify more lightweight presets:

presets = ['good_quality', 'optimize_for_deployment']
predictor_light = TabularPredictor(label=label, eval_metric=metric).fit(train_data, presets=presets, time_limit=30)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_053016/"
Presets specified: ['good_quality', 'optimize_for_deployment']
Beginning AutoGluon training ... Time limit = 30s
AutoGluon will save models to "AutogluonModels/ag-20220521_053016/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    21402.8 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.08s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Fitting 11 L1 models ...
Fitting model: NeuralNetFastAI_BAG_L1 ... Training model for up to 29.92s of the 29.92s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3129   = Validation score   (accuracy)
    3.37s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: LightGBMXT_BAG_L1 ... Training model for up to 26.32s of the 26.32s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3497   = Validation score   (accuracy)
    3.14s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: LightGBM_BAG_L1 ... Training model for up to 22.92s of the 22.92s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3395   = Validation score   (accuracy)
    3.16s    = Training   runtime
    0.04s    = Validation runtime
Fitting model: RandomForestGini_BAG_L1 ... Training model for up to 19.46s of the 19.45s of remaining time.
    0.319    = Validation score   (accuracy)
    0.77s    = Training   runtime
    0.12s    = Validation runtime
Fitting model: RandomForestEntr_BAG_L1 ... Training model for up to 18.53s of the 18.53s of remaining time.
    0.2863   = Validation score   (accuracy)
    0.8s     = Training   runtime
    0.12s    = Validation runtime
Fitting model: CatBoost_BAG_L1 ... Training model for up to 17.57s of the 17.57s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3374   = Validation score   (accuracy)
    15.24s   = Training   runtime
    0.04s    = Validation runtime
Fitting model: ExtraTreesGini_BAG_L1 ... Training model for up to 2.02s of the 2.01s of remaining time.
    0.3108   = Validation score   (accuracy)
    0.84s    = Training   runtime
    0.12s    = Validation runtime
Fitting model: ExtraTreesEntr_BAG_L1 ... Training model for up to 1.02s of the 1.02s of remaining time.
    0.3149   = Validation score   (accuracy)
    0.72s    = Training   runtime
    0.12s    = Validation runtime
Fitting model: XGBoost_BAG_L1 ... Training model for up to 0.14s of the 0.13s of remaining time.
    Fitting 5 child models (S1F1 - S1F5) | Fitting with ParallelLocalFoldFittingStrategy
    0.3252   = Validation score   (accuracy)
    1.5s     = Training   runtime
    0.04s    = Validation runtime
Completed 1/20 k-fold bagging repeats ...
Fitting model: WeightedEnsemble_L2 ... Training model for up to 29.92s of the -1.7s of remaining time.
    0.3497   = Validation score   (accuracy)
    0.35s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 32.06s ... Best model: "WeightedEnsemble_L2"
Fitting 1 L1 models ...
Fitting model: LightGBMXT_BAG_L1_FULL ...
    0.4s     = Training   runtime
Deleting model NeuralNetFastAI_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/NeuralNetFastAI_BAG_L1/ will be removed.
Deleting model LightGBMXT_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/LightGBMXT_BAG_L1/ will be removed.
Deleting model LightGBM_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/LightGBM_BAG_L1/ will be removed.
Deleting model RandomForestGini_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/RandomForestGini_BAG_L1/ will be removed.
Deleting model RandomForestEntr_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/RandomForestEntr_BAG_L1/ will be removed.
Deleting model CatBoost_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/CatBoost_BAG_L1/ will be removed.
Deleting model ExtraTreesGini_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/ExtraTreesGini_BAG_L1/ will be removed.
Deleting model ExtraTreesEntr_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/ExtraTreesEntr_BAG_L1/ will be removed.
Deleting model XGBoost_BAG_L1. All files under AutogluonModels/ag-20220521_053016/models/XGBoost_BAG_L1/ will be removed.
Deleting model WeightedEnsemble_L2. All files under AutogluonModels/ag-20220521_053016/models/WeightedEnsemble_L2/ will be removed.
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_053016/")

Another option is to specify more lightweight hyperparameters:

predictor_light = TabularPredictor(label=label, eval_metric=metric).fit(train_data, hyperparameters='very_light', time_limit=30)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_053049/"
Beginning AutoGluon training ... Time limit = 30s
AutoGluon will save models to "AutogluonModels/ag-20220521_053049/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    20781.43 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.09s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Automatically generating train/validation split with holdout_frac=0.2, Train Rows: 391, Val Rows: 98
Fitting 7 L1 models ...
Fitting model: NeuralNetFastAI ... Training model for up to 29.91s of the 29.91s of remaining time.
No improvement since epoch 6: early stopping
    0.3265   = Validation score   (accuracy)
    0.46s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBMXT ... Training model for up to 29.43s of the 29.42s of remaining time.
    0.3571   = Validation score   (accuracy)
    0.82s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBM ... Training model for up to 28.58s of the 28.58s of remaining time.
    0.3673   = Validation score   (accuracy)
    1.22s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: CatBoost ... Training model for up to 27.35s of the 27.35s of remaining time.
    0.3469   = Validation score   (accuracy)
    16.29s   = Training   runtime
    0.01s    = Validation runtime
Fitting model: XGBoost ... Training model for up to 11.04s of the 11.04s of remaining time.
    0.398    = Validation score   (accuracy)
    3.73s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: NeuralNetTorch ... Training model for up to 7.3s of the 7.29s of remaining time.
    0.3061   = Validation score   (accuracy)
    3.05s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBMLarge ... Training model for up to 4.23s of the 4.23s of remaining time.
    0.2653   = Validation score   (accuracy)
    3.12s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: WeightedEnsemble_L2 ... Training model for up to 29.91s of the 1.0s of remaining time.
    0.4082   = Validation score   (accuracy)
    0.18s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 29.2s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_053049/")

Here you can set hyperparameters to either ‘light’, ‘very_light’, or ‘toy’ to obtain progressively smaller (but less accurate) models and predictors. Advanced users may instead try manually specifying particular models’ hyperparameters in order to make them faster/smaller.

Finally, you may also exclude specific unwieldy models from being trained at all. Below we exclude models that tend to be slower (K Nearest Neighbors, Neural Network, models with custom larger-than-default hyperparameters):

excluded_model_types = ['KNN', 'NN_TORCH', 'custom']
predictor_light = TabularPredictor(label=label, eval_metric=metric).fit(train_data, excluded_model_types=excluded_model_types, time_limit=30)

No path specified. Models will be saved in: "AutogluonModels/ag-20220521_053118/"
Beginning AutoGluon training ... Time limit = 30s
AutoGluon will save models to "AutogluonModels/ag-20220521_053118/"
AutoGluon Version:  0.4.1b20220521
Python Version:     3.9.12
Operating System:   Linux
Train Data Rows:    500
Train Data Columns: 14
Label Column: occupation
Preprocessing data ...
AutoGluon infers your prediction problem is: 'multiclass' (because dtype of label-column == object).
    First 10 (of 15) unique label values:  [' Exec-managerial', ' Other-service', ' Craft-repair', ' Sales', ' Prof-specialty', ' Protective-serv', ' ?', ' Adm-clerical', ' Machine-op-inspct', ' Tech-support']
    If 'multiclass' is not the correct problem_type, please manually specify the problem_type parameter during predictor init (You may specify problem_type as one of: ['binary', 'multiclass', 'regression'])
Warning: Some classes in the training set have fewer than 10 examples. AutoGluon will only keep 12 out of 15 classes for training and will not try to predict the rare classes. To keep more classes, increase the number of datapoints from these rare classes in the training data or reduce label_count_threshold.
Fraction of data from classes with at least 10 examples that will be kept for training models: 0.978
Train Data Class Count: 12
Using Feature Generators to preprocess the data ...
Fitting AutoMLPipelineFeatureGenerator...
    Available Memory:                    20746.12 MB
    Train Data (Original)  Memory Usage: 0.28 MB (0.0% of available memory)
    Inferring data type of each feature based on column values. Set feature_metadata_in to manually specify special dtypes of the features.
    Stage 1 Generators:
            Fitting AsTypeFeatureGenerator...
                    Note: Converting 2 features to boolean dtype as they only contain 2 unique values.
    Stage 2 Generators:
            Fitting FillNaFeatureGenerator...
    Stage 3 Generators:
            Fitting IdentityFeatureGenerator...
            Fitting CategoryFeatureGenerator...
                    Fitting CategoryMemoryMinimizeFeatureGenerator...
    Stage 4 Generators:
            Fitting DropUniqueFeatureGenerator...
    Types of features in original data (raw dtype, special dtypes):
            ('int', [])    : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('object', []) : 8 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
    Types of features in processed data (raw dtype, special dtypes):
            ('category', [])  : 6 | ['workclass', 'education', 'marital-status', 'relationship', 'race', ...]
            ('int', [])       : 6 | ['age', 'fnlwgt', 'education-num', 'capital-gain', 'capital-loss', ...]
            ('int', ['bool']) : 2 | ['sex', 'class']
    0.1s = Fit runtime
    14 features in original data used to generate 14 features in processed data.
    Train Data (Processed) Memory Usage: 0.03 MB (0.0% of available memory)
Data preprocessing and feature engineering runtime = 0.08s ...
AutoGluon will gauge predictive performance using evaluation metric: 'accuracy'
    To change this, specify the eval_metric parameter of Predictor()
Automatically generating train/validation split with holdout_frac=0.2, Train Rows: 391, Val Rows: 98
Excluded Model Types: ['KNN', 'NN_TORCH', 'custom']
    Found 'NN_TORCH' model in hyperparameters, but 'NN_TORCH' is present in excluded_model_types and will be removed.
    Found 'KNN' model in hyperparameters, but 'KNN' is present in excluded_model_types and will be removed.
    Found 'KNN' model in hyperparameters, but 'KNN' is present in excluded_model_types and will be removed.
Fitting 10 L1 models ...
Fitting model: NeuralNetFastAI ... Training model for up to 29.92s of the 29.91s of remaining time.
No improvement since epoch 6: early stopping
    0.3265   = Validation score   (accuracy)
    0.48s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBMXT ... Training model for up to 29.42s of the 29.42s of remaining time.
    0.3571   = Validation score   (accuracy)
    0.79s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBM ... Training model for up to 28.61s of the 28.61s of remaining time.
    0.3673   = Validation score   (accuracy)
    1.14s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: RandomForestGini ... Training model for up to 27.45s of the 27.45s of remaining time.
    0.3061   = Validation score   (accuracy)
    0.78s    = Training   runtime
    0.08s    = Validation runtime
Fitting model: RandomForestEntr ... Training model for up to 26.56s of the 26.55s of remaining time.
    0.3163   = Validation score   (accuracy)
    0.82s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: CatBoost ... Training model for up to 25.63s of the 25.63s of remaining time.
    0.3469   = Validation score   (accuracy)
    16.3s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: ExtraTreesGini ... Training model for up to 9.32s of the 9.32s of remaining time.
    0.2653   = Validation score   (accuracy)
    0.72s    = Training   runtime
    0.07s    = Validation runtime
Fitting model: ExtraTreesEntr ... Training model for up to 8.5s of the 8.49s of remaining time.
    0.3061   = Validation score   (accuracy)
    0.7s     = Training   runtime
    0.07s    = Validation runtime
Fitting model: XGBoost ... Training model for up to 7.69s of the 7.69s of remaining time.
    0.398    = Validation score   (accuracy)
    3.63s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: LightGBMLarge ... Training model for up to 4.04s of the 4.04s of remaining time.
    0.2653   = Validation score   (accuracy)
    3.26s    = Training   runtime
    0.01s    = Validation runtime
Fitting model: WeightedEnsemble_L2 ... Training model for up to 29.92s of the 0.32s of remaining time.
    0.398    = Validation score   (accuracy)
    0.25s    = Training   runtime
    0.0s     = Validation runtime
AutoGluon training complete, total runtime = 29.95s ... Best model: "WeightedEnsemble_L2"
TabularPredictor saved. To load, use: predictor = TabularPredictor.load("AutogluonModels/ag-20220521_053118/")

If you encounter memory issues¶

To reduce memory usage during training, you may try each of the following strategies individually or combinations of them (these may harm accuracy):

In fit(), set num_bag_sets = 1 (can also try values greater than 1 to harm accuracy less).
In fit(), set excluded_model_types = ['KNN', 'XT' ,'RF'] (or some subset of these models).
Try different presets in fit().
In fit(), set hyperparameters = 'light' or hyperparameters = 'very_light'.
Text fields in your table require substantial memory for N-gram featurization. To mitigate this in fit(), you can either: (1) add 'ignore_text' to your presets list (to ignore text features), or (2) specify the argument:

from sklearn.feature_extraction.text import CountVectorizer
from autogluon.features.generators import AutoMLPipelineFeatureGenerator
feature_generator = AutoMLPipelineFeatureGenerator(vectorizer=CountVectorizer(min_df=30, ngram_range=(1, 3), max_features=MAX_NGRAM, dtype=np.uint8))

for example using MAX_NGRAM = 1000 (try various values under 10000 to reduce the number of N-gram features used to represent each text field)

In addition to reducing memory usage, many of the above strategies can also be used to reduce training times.

To reduce memory usage during inference:

If trying to produce predictions for a large test dataset, break the test data into smaller chunks as demonstrated in FAQ.
If models have been previously persisted in memory but inference-speed is not a major concern, call predictor.unpersist_models().
If models have been previously persisted in memory, bagging was used in fit(), and inference-speed is a concern: call predictor.refit_full() and use one of the refit-full models for prediction (ensure this is the only model persisted in memory).

If you encounter disk space issues¶

To reduce disk usage, you may try each of the following strategies individually or combinations of them:

Make sure to delete all predictor.path folders from previous fit() runs! These can eat up your free space if you call fit() many times. If you didn’t specify path, AutoGluon still automatically saved its models to a folder called: “AutogluonModels/ag-[TIMESTAMP]”, where TIMESTAMP records when fit() was called, so make sure to also delete these folders if you run low on free space.
Call predictor.save_space() to delete auxiliary files produced during fit().
Call predictor.delete_models(models_to_keep='best', dry_run=False) if you only intend to use this predictor for inference going forward (will delete files required for non-prediction-related functionality like fit_summary).
In fit(), you can add 'optimize_for_deployment' to the presets list, which will automatically invoke the previous two strategies after training.
Most of the above strategies to reduce memory usage will also reduce disk usage (but may harm accuracy).

References¶

The following paper describes how AutoGluon internally operates on tabular data:

Erickson et al. AutoGluon-Tabular: Robust and Accurate AutoML for Structured Data. Arxiv, 2020.