# Neuraxle Pipelines¶

Code Machine Learning Pipelines - The Right Way.

Neuraxle is a Machine Learning (ML) library for building clean machine learning pipelines using the right abstractions.

• Component-Based: Build encapsulated steps, then compose them to build complex pipelines.

• Evolving State: Each pipeline step can fit, and evolve through the learning process

• Hyperparameter Tuning: Optimize your pipelines using AutoML, where each pipeline step has their own hyperparameter space.

• Compatible: Use your favorite machine learning libraries inside and outside Neuraxle pipelines.

• Production Ready: Pipeline steps can manage how they are saved by themselves, and the lifecycle of the objects allow for train, and test modes.

• Streaming Pipeline: Transform data in many pipeline steps at the same time in parallel using multiprocessing Queues.

## Documentation¶

You can find the Neuraxle documentation on the website. It also contains multiple examples demonstrating some of its features.

## Installation¶

Simply do:

pip install neuraxle


### Examples¶

We have several examples on the website.

For example, you can build a time series processing pipeline as such:

p = Pipeline([
TrainOnlyWrapper(DataShuffler()),
WindowTimeSeries(),

])

X_train, y_train, X_test, y_test = generate_classification_data()

# The pipeline will learn on the data and acquire state.
p = p.fit(X_train, y_train)

# Once it learned, the pipeline can process new and
# unseen data for making predictions.
y_test_predicted = p.predict(X_test)


You can also tune your hyperparameters using AutoML algorithms such as the TPE:

# Define classification models with hyperparams.

# All SKLearn models can be used and compared to each other.
# Define them an hyperparameter space like this:
decision_tree_classifier = SKLearnWrapper(
DecisionTreeClassifier(),
HyperparameterSpace({
'criterion': Choice(['gini', 'entropy']),
'splitter': Choice(['best', 'random']),
'min_samples_leaf': RandInt(2, 5),
'min_samples_split': RandInt(2, 4)
}))

# More SKLearn models can be added (code details skipped):
random_forest_classifier = ...
logistic_regression = ...

# It's possible to mix TensorFlow models into Neuraxle as well,
# using Neuraxle-Tensorflow' Tensorflow2ModelStep class, passing in
# the TensorFlow functions like create_model and create_optimizer:
minibatched_tensorflow_classifier = EpochRepeater(MiniBatchSequentialPipeline([
Tensorflow2ModelStep(
create_model=create_linear_model,
create_loss=create_mse_loss_with_regularization
).set_hyperparams_space(HyperparameterSpace({
'hidden_dim': RandInt(6, 750),
'layers_stacked_count': RandInt(1, 4),
'lambda_loss_amount': Uniform(0.0003, 0.001),
'learning_rate': Uniform(0.001, 0.01),
'window_size_future': FixedHyperparameter(sequence_length),
'output_dim': FixedHyperparameter(output_dim),
'input_dim': FixedHyperparameter(input_dim)
}))
]), epochs=42)

# Define a classification pipeline that lets the AutoML loop choose one of the classifier.
pipeline = Pipeline([
ChooseOneStepOf([
decision_tree_classifier,
random_forest_classifier,
logistic_regression,
minibatched_tensorflow_classifier,
])
])

# Create the AutoML loop object.
auto_ml = AutoML(
pipeline=pipeline,
hyperparams_optimizer=TreeParzenEstimator(
# This is the TPE as in Hyperopt.
number_of_initial_random_step=20,
),
validation_splitter=ValidationSplitter(validation_size=0.20),
scoring_callback=ScoringCallback(accuracy_score, higher_score_is_better=True),
n_trials=40,
epochs=1,  # Could be higher if only TF models were used.
hyperparams_repository=HyperparamsOnDiskRepository(cache_folder=neuraxle_dashboard),
refit_best_trial=True,
continue_loop_on_error=False
)

# Load data, and launch AutoML loop!
X_train, y_train, X_test, y_test = generate_classification_data()
auto_ml = auto_ml.fit(X_train, y_train)

# Get the model from the best trial, and make predictions using predict, as per the refit_best_trial=True argument to AutoML.
y_pred = auto_ml.predict(X_test)

accuracy = accuracy_score(y_true=y_test, y_pred=y_pred)
print("Test accuracy score:", accuracy)


#### Why Neuraxle ?¶

Most research projects don’t ever get to production. However, you want your project to be production-ready and already adaptable (clean) by the time you finish it. You also want things to be simple so that you can get started quickly. Read more about the why of Neuraxle here.

#### Community¶

For technical questions, please post them on StackOverflow using the neuraxle tag. The StackOverflow question will automatically be posted in Neuraxio’s Slack workspace and our Gitter in the #Neuraxle channel.

For suggestions, feature requests, and error reports, please open an issue.

For contributors, we recommend using the PyCharm code editor and to let it manage the virtual environment, with the default code auto-formatter, and using pytest as a test runner. To contribute, first fork the project, then do your changes, and then open a pull request in the main repository. Please make your pull request(s) editable, such as for us to add you to the list of contributors if you didn’t add the entry, for example. Ensure that all tests run before opening a pull request. You’ll also agree that your contributions will be licensed under the Apache 2.0 License, which is required for everyone to be able to use your open-source contributions.

Finally, you can as well join our Slack workspace and our Gitter to collaborate with us. We <3 collaborators. You can also subscribe to our mailing list where we will post some updates and news.

### Citation¶

You may cite our extended abstract that was presented at the Montreal Artificial Intelligence Symposium (MAIS) 2019. Here is the bibtex code to cite:

@misc{neuraxle,
author = {Chevalier, Guillaume and Brillant, Alexandre and Hamel, Eric},
year = {2019},
month = {09},
pages = {},
title = {Neuraxle - A Python Framework for Neat Machine Learning Pipelines},
doi = {10.13140/RG.2.2.33135.59043}
}


### Contributors¶

Thanks to everyone who contributed to the project:

### Supported By¶

We thank these organisations for generously supporting the project: