scikit-roughsets's Introduction

scikit-roughsets

This is an implementation of rough sets feature reduction algorithm, based on MATLAB code from Dingyu Xue, YangQuan Chen. Solving applied mathematical problems with MATLAB. Integration with scikit-learn package is also provided.

Installation

The package can be easily installed using Python's pip utility.

Usage

The usage is simplly straightforward, identical to scikit's feature selection module:

from scikit_roughsets.rs_reduction import RoughSetsSelector
import numpy as np

y = np.array([[1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1]]).T
X = np.array([[1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1],
              [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
              [1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0],
              [0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1],
              [1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0],
              [0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1],
              [1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1],
              [1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1],
              [1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1],
              [1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1],
              [1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1],
              [1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1]])

selector = RoughSetsSelector()
X_selected = selector.fit(X, y).transform(X)

Several restrictions apply to its current use:

X must be an integer matrix, and y must must be an integer array
It does not work with NaN values, thus, initial preprocessiong must be performed by the user

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