sklearn-export 0.0.5

Export sklearn models to Json.

sklearn-export

This package is based on sklearn port from https://github.com/nok/sklearn-porter. I chose to build it because sklearn port saves data in matrix format. However, most popular algebra libraries are used to working with vectors. Then, sklearn-export saves the sklearn model data in Json format (as column vectors). Note that this is a beta version yet, then only some models and functionalities are supported.

New features (0.0.4)

Bug corrections and add support to SVR and LinearSVR.

Support

Class	Details
sklearn.svm.SVC	C-Support Vector Classification. The multiclass support is handled according to a one-vs-one scheme.
sklearn.svm.NuSVC	Nu-Support Vector Classification. Similar to SVC but uses a parameter to control the number of support vectors.
sklearn.svc.LinearSVC	Linear Support Vector Classification.
sklearn.neural_network.MLPClassifier	Multi-layer Perceptron classifier.
sklearn.neural_network.MLPRegressor	Multi-layer Perceptron regressor.
sklearn.linear_model.LogisticRegression	Logistic Regression (aka logit, MaxEnt) classifier.
sklearn.linear_model.LinearRegression	Ordinary least squares Linear Regression.
sklearn.preprocessing.MinMaxScaler	Transforms features by scaling each feature to a given range.
sklearn.preprocessing.StandardScaler	Standardize features by removing the mean and scaling to unit variance
sklearn.svm.SVR	Epsilon-Support Vector Regression.
sklearn.svm.LinearSVR	Linear Support Vector Regression.

Observation: details where extracted from sklearn documentation.

Installation

We recommend to make a instalation using pip:

$ pip install sklearn_export

If you are using jupyter notebooks consider to install sklearn_export through a notebook cell. Then, you can type and execute the following:

import sys
!{sys.executable} -m pip install sklearn_export

Usage

Actually sklearn-export can save Classifiers, Regressions and some Scalers (see Support session).

Saving a Model or Scaler

The basic usage is to save a simple model.

# Basic imports
from sklearn.datasets import load_iris
from sklearn_export import Export
from sklearn.neural_network import MLPRegressor

# Load data and train model
samples = load_iris()
X, y = samples.data, samples.target
clf = MLPRegressor()
clf.fit(X, y)

# Save using sklearn_export
export = Export(clf)
export.to_json()

The result is a Json file that can be load in any language.

Saving a Model and a Scaler

The sklearn-export can also save more then one class in the same Json. This is usefull to store a Classifier and a Scaler (for example). To be honest, actually is only possible to store a pair Model and Scaler.

# Basic imports
from sklearn.datasets import load_iris
from sklearn_export import Export
from sklearn.preprocessing import StandardScaler
from sklearn.neural_network import MLPRegressor

# Load data
samples = load_iris()
X, y = samples.data, samples.target

# Normalize data
scaler = StandardScaler()
Xz = scaler.fit_transform(X)

# Train model with normalized data
clf = MLPRegressor()
clf.fit(Xz, y)

# Save model and scaler using sklearn_export
export = Export([scaler, clf])
export.to_json()

The result is a Json file that contains information about a Model and a Scaler. The file can be load in any language.

Extra options

The method to_json() also support some other parameters:

Parameter	Details	Default
filename	Name of the output Json file	data.json
directory	Path to save the file	.
with_md5_hash	Name of the output Json file	False

Questions

If you have any question please send me a mail [e-mail].