LightAutoML - automatic model creation framework

LightAutoML (LAMA) is an AutoML framework by Sber AI Lab.

It provides automatic model creation for the following tasks:

• binary classification
• multiclass classification
• regression

Current version of the package handles datasets that have independent samples in each row. I.e. each row is an object with its specific features and target. Multitable datasets and sequences are a work in progress :)

Note: we use AutoWoE library to automatically create interpretable models.

Authors: Alexander Ryzhkov, Anton Vakhrushev, Dmitry Simakov, Vasilii Bunakov, Rinchin Damdinov, Pavel Shvets, Alexander Kirilin.

Documentation of LightAutoML is available here, you can also generate it.

Table of Contents

• Installation LightAutoML from PyPI
• Quick tour
• Resources
• Contributing to LightAutoML
• License
• For developers
• Support and feature requests

Installation

To install LAMA framework on your machine from PyPI, execute following commands:

# Install base functionality:

pip install -U lightautoml

# For partial installation use corresponding option.
# Extra dependecies: [nlp, cv, report]
# Or you can use 'all' to install everything

pip install -U lightautoml[nlp]

Additionaly, run following commands to enable pdf report generation:

# MacOS
brew install cairo pango gdk-pixbuf libffi

# Debian / Ubuntu
sudo apt-get install build-essential libcairo2 libpango-1.0-0 libpangocairo-1.0-0 libgdk-pixbuf2.0-0 libffi-dev shared-mime-info

# Fedora
sudo yum install redhat-rpm-config libffi-devel cairo pango gdk-pixbuf2

# Windows
# follow this tutorial https://weasyprint.readthedocs.io/en/stable/install.html#windows

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Quick tour

Let's solve the popular Kaggle Titanic competition below. There are two main ways to solve machine learning problems using LightAutoML:

• Use ready preset for tabular data:

import pandas as pd
from sklearn.metrics import f1_score

from lightautoml.automl.presets.tabular_presets import TabularAutoML
from lightautoml.tasks import Task

df_train = pd.read_csv('../input/titanic/train.csv')
df_test = pd.read_csv('../input/titanic/test.csv')

automl = TabularAutoML(
    task = Task(
        name = 'binary',
        metric = lambda y_true, y_pred: f1_score(y_true, (y_pred > 0.5)*1))
)
oof_pred = automl.fit_predict(
    df_train,
    roles = {'target': 'Survived', 'drop': ['PassengerId']}
)
test_pred = automl.predict(df_test)

pd.DataFrame({
    'PassengerId':df_test.PassengerId,
    'Survived': (test_pred.data[:, 0] > 0.5)*1
}).to_csv('submit.csv', index = False)

LighAutoML framework has a lot of ready-to-use parts and extensive customization options, to learn more check out the resources section.

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Resources

Kaggle kernel examples of LightAutoML usage:

• Tabular Playground Series April 2021 competition solution
• Titanic competition solution (80% accuracy)
• Titanic 12-code-lines competition solution (78% accuracy)
• House prices competition solution
• Natural Language Processing with Disaster Tweets solution
• Tabular Playground Series March 2021 competition solution
• Tabular Playground Series February 2021 competition solution
• Interpretable WhiteBox solution
• Custom ML pipeline elements inside existing ones

Google Colab tutorials and other examples:

• Tutorial_1_basics.ipynb - get started with LightAutoML on tabular data.
• Tutorial_2_WhiteBox_AutoWoE.ipynb - creating interpretable models.
• Tutorial_3_sql_data_source.ipynb - shows how to use LightAutoML presets (both standalone and time utilized variants) for solving ML tasks on tabular data from SQL data base instead of CSV.
• Tutorial_4_NLP_Interpretation.ipynb - example of using TabularNLPAutoML preset, LimeTextExplainer.
• Tutorial_5_uplift.ipynb - shows how to use LightAutoML for a uplift-modeling task.
• Tutorial_6_custom_pipeline.ipynb - shows how to create your own pipeline from specified blocks: pipelines for feature generation and feature selection, ML algorithms, hyperparameter optimization etc.
• Tutorial_7_ICE_and_PDP_interpretation.ipynb - shows how to obtain local and global interpretation of model results using ICE and PDP approaches.

Note 1: for production you have no need to use profiler (which increase work time and memory consomption), so please do not turn it on - it is in off state by default

Note 2: to take a look at this report after the run, please comment last line of demo with report deletion command.

Courses, videos and papers

• LightAutoML crash courses:

  • (Russian) AutoML course for OpenDataScience community

• Video guides:

  • (Russian) LightAutoML webinar for Sberloga community (Alexander Ryzhkov, Dmitry Simakov)
  • (Russian) LightAutoML hands-on tutorial in Kaggle Kernels (Alexander Ryzhkov)
  • (English) Automated Machine Learning with LightAutoML: theory and practice (Alexander Ryzhkov)
  • (English) LightAutoML framework general overview, benchmarks and advantages for business (Alexander Ryzhkov)
  • (English) LightAutoML practical guide - ML pipeline presets overview (Dmitry Simakov)

• Papers:

  • Anton Vakhrushev, Alexander Ryzhkov, Dmitry Simakov, Rinchin Damdinov, Maxim Savchenko, Alexander Tuzhilin "LightAutoML: AutoML Solution for a Large Financial Services Ecosystem". arXiv:2109.01528, 2021.

• Articles about LightAutoML:

  • (English) LightAutoML vs Titanic: 80% accuracy in several lines of code (Medium)
  • (English) Hands-On Python Guide to LightAutoML – An Automatic ML Model Creation Framework (Analytic Indian Mag)

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Contributing to LightAutoML

If you are interested in contributing to LightAutoML, please read the Contributing Guide to get started.

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License

This project is licensed under the Apache License, Version 2.0. See LICENSE file for more details.

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For developers

Installation from source code

First of all you need to install git and poetry.

# Load LAMA source code
git clone https://github.com/sberbank-ai-lab/LightAutoML.git

cd LightAutoML/

# !!!Choose only one item!!!

# 1. Global installation: Don't create virtual environment
poetry config virtualenvs.create false --local

# 2. Recommended: Create virtual environment inside your project directory
poetry config virtualenvs.in-project true

# For more information read poetry docs

# Install LAMA
poetry lock
poetry install

Build your own custom pipeline:

import pandas as pd
from sklearn.metrics import f1_score

from lightautoml.automl.presets.tabular_presets import TabularAutoML
from lightautoml.tasks import Task

df_train = pd.read_csv('../input/titanic/train.csv')
df_test = pd.read_csv('../input/titanic/test.csv')

# define that machine learning problem is binary classification
task = Task("binary")

reader = PandasToPandasReader(task, cv=N_FOLDS, random_state=RANDOM_STATE)

# create a feature selector
model0 = BoostLGBM(
    default_params={'learning_rate': 0.05, 'num_leaves': 64,
    'seed': 42, 'num_threads': N_THREADS}
)
pipe0 = LGBSimpleFeatures()
mbie = ModelBasedImportanceEstimator()
selector = ImportanceCutoffSelector(pipe0, model0, mbie, cutoff=0)

# build first level pipeline for AutoML
pipe = LGBSimpleFeatures()
# stop after 20 iterations or after 30 seconds
params_tuner1 = OptunaTuner(n_trials=20, timeout=30)
model1 = BoostLGBM(
    default_params={'learning_rate': 0.05, 'num_leaves': 128,
    'seed': 1, 'num_threads': N_THREADS}
)
model2 = BoostLGBM(
    default_params={'learning_rate': 0.025, 'num_leaves': 64,
    'seed': 2, 'num_threads': N_THREADS}
)
pipeline_lvl1 = MLPipeline([
    (model1, params_tuner1),
    model2
], pre_selection=selector, features_pipeline=pipe, post_selection=None)

# build second level pipeline for AutoML
pipe1 = LGBSimpleFeatures()
model = BoostLGBM(
    default_params={'learning_rate': 0.05, 'num_leaves': 64,
    'max_bin': 1024, 'seed': 3, 'num_threads': N_THREADS},
    freeze_defaults=True
)
pipeline_lvl2 = MLPipeline([model], pre_selection=None, features_pipeline=pipe1,
 post_selection=None)

# build AutoML pipeline
automl = AutoML(reader, [
    [pipeline_lvl1],
    [pipeline_lvl2],
], skip_conn=False)

# train AutoML and get predictions
oof_pred = automl.fit_predict(df_train, roles = {'target': 'Survived', 'drop': ['PassengerId']})
test_pred = automl.predict(df_test)

pd.DataFrame({
    'PassengerId':df_test.PassengerId,
    'Survived': (test_pred.data[:, 0] > 0.5)*1
}).to_csv('submit.csv', index = False)

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Support and feature requests

Seek prompt advice at Slack community or Telegram group.

Open bug reports and feature requests on GitHub issues.