sklearn-porter

Transpile trained scikit-learn estimators to C, Java, JavaScript and others.
It's recommended for limited embedded systems and critical applications where performance matters most.

Important

We're hard working on the first major release of sklearn-porter.
Until that we will just release bugfixes to the stable version.

Estimators

Estimator	Programming language
Classifier	Java *	JS	C	Go	PHP	Ruby
svm.SVC	✓, ✓ ᴵ	✓	✓		✓	✓
svm.NuSVC	✓, ✓ ᴵ	✓	✓		✓	✓
svm.LinearSVC	✓, ✓ ᴵ	✓	✓	✓	✓	✓
tree.DecisionTreeClassifier	✓, ✓ ᴱ, ✓ ᴵ	✓, ✓ ᴱ	✓, ✓ ᴱ	✓, ✓ ᴱ	✓, ✓ ᴱ	✓, ✓ ᴱ
ensemble.RandomForestClassifier	✓ ᴱ, ✓ ᴵ	✓ ᴱ	✓ ᴱ	✓ ᴱ	✓ ᴱ	✓ ᴱ
ensemble.ExtraTreesClassifier	✓ ᴱ, ✓ ᴵ	✓ ᴱ	✓ ᴱ		✓ ᴱ	✓ ᴱ
ensemble.AdaBoostClassifier	✓ ᴱ, ✓ ᴵ	✓ ᴱ, ✓ ᴵ	✓ ᴱ
neighbors.KNeighborsClassifier	✓, ✓ ᴵ	✓, ✓ ᴵ
naive_bayes.GaussianNB	✓, ✓ ᴵ	✓
naive_bayes.BernoulliNB	✓, ✓ ᴵ	✓
neural_network.MLPClassifier	✓, ✓ ᴵ	✓, ✓ ᴵ
Regressor	Java *	JS	C	Go	PHP	Ruby
neural_network.MLPRegressor		✓

✓ = is full-featured,　ᴱ = with embedded model data,　ᴵ = with imported model data,　* = default language

Installation

Stable

$ pip install sklearn-porter

Development

If you want the latest changes, you can install this package from the master branch:

$ pip uninstall -y sklearn-porter
$ pip install --no-cache-dir https://github.com/nok/sklearn-porter/zipball/master

Usage

Export

The following example demonstrates how you can transpile a decision tree estimator to Java:

from sklearn.datasets import load_iris
from sklearn.tree import tree
from sklearn_porter import Porter

# Load data and train the classifier:
samples = load_iris()
X, y = samples.data, samples.target
clf = tree.DecisionTreeClassifier()
clf.fit(X, y)

# Export:
porter = Porter(clf, language='java')
output = porter.export(embed_data=True)
print(output)

The exported result matches the official human-readable version of the decision tree.

Integrity

You should always check and compute the integrity between the original and the transpiled estimator:

# ...
porter = Porter(clf, language='java')

# Compute integrity score:
integrity = porter.integrity_score(X)
print(integrity)  # 1.0

Prediction

You can compute the prediction(s) in the target programming language:

# ...
porter = Porter(clf, language='java')

# Prediction(s):
Y_java = porter.predict(X)
y_java = porter.predict(X[0])
y_java = porter.predict([1., 2., 3., 4.])

Notebooks

You can run and test all notebooks by starting a Jupyter notebook server locally:

$ make open.examples
$ make stop.examples

CLI

In general you can use the porter on the command line:

$ porter <pickle_file> [--to <directory>]
         [--class_name <class_name>] [--method_name <method_name>]
         [--export] [--checksum] [--data] [--pipe]
         [--c] [--java] [--js] [--go] [--php] [--ruby]
         [--version] [--help]

The following example shows how you can save a trained estimator to the pickle format:

# ...

# Extract estimator:
joblib.dump(clf, 'estimator.pkl', compress=0)

After that the estimator can be transpiled to JavaScript by using the following command:

$ porter estimator.pkl --js

The target programming language is changeable on the fly:

$ porter estimator.pkl --c
$ porter estimator.pkl --java
$ porter estimator.pkl --php
$ porter estimator.pkl --java
$ porter estimator.pkl --ruby

For further processing the argument --pipe can be used to pass the result:

$ porter estimator.pkl --js --pipe > estimator.js

For instance the result can be minified by using UglifyJS:

$ porter estimator.pkl --js --pipe | uglifyjs --compress -o estimator.min.js

Development

Environment

You have to install required modules for broader development:

$ make install.environment  # conda environment (optional)
$ make install.requirements.development  # pip requirements

Independently, the following compilers and intepreters are required to cover all tests:

Name	Version	Command
GCC	>=4.2	gcc --version
Java	>=1.6	java -version
PHP	>=5.6	php --version
Ruby	>=2.4.1	ruby --version
Go	>=1.7.4	go version
Node.js	>=6	node --version

Testing

The tests cover module functions as well as matching predictions of transpiled estimators. Start all tests with:

$ make test

The test files have a specific pattern: '[Algorithm][Language]Test.py':

$ pytest tests -v -o python_files='RandomForest*Test.py'
$ pytest tests -v -o python_files='*JavaTest.py'

While you are developing new features or fixes, you can reduce the test duration by changing the number of tests:

$ N_RANDOM_FEATURE_SETS=5 N_EXISTING_FEATURE_SETS=10 \
  pytest tests -v -o python_files='*JavaTest.py'

Quality

It's highly recommended to ensure the code quality. For that Pylint is used. Start the linter with:

$ make lint

Citation

If you use this implementation in you work, please add a reference/citation to the paper. You can use the following BibTeX entry:

@unpublished{skpodamo,
  author = {Darius Morawiec},
  title = {sklearn-porter},
  note = {Transpile trained scikit-learn estimators to C, Java, JavaScript and others},
  url = {https://github.com/nok/sklearn-porter}
}

License

The module is Open Source Software released under the MIT license.

Questions?

Don't be shy and feel free to contact me on Twitter or Gitter.