src/main/python/tests/algorithms/test_multiLogReg.py

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import unittest

import numpy as np
from systemds.context import SystemDSContext
from systemds.matrix import Matrix
from systemds.operator.algorithm import multiLogReg, multiLogRegPredict


class TestMultiLogReg(unittest.TestCase):

    sds: SystemDSContext = None

    @classmethod
    def setUpClass(cls):
        cls.sds = SystemDSContext()

    @classmethod
    def tearDownClass(cls):
        cls.sds.close()

    def test_simple(self):
        """
        Test simple, if the log reg splits a dataset where everything over 1 is label 2 and under 1 is 1.
        With manual classification.
        """
        [X, labels, Y] = self.gen_data()

        # Call algorithm
        bias = multiLogReg(Matrix(self.sds,X),Matrix(self.sds,Y)).compute()
        
        # Calculate result.
        res = np.reshape(np.dot(X, bias[:len(X[0])]) + bias[len(X[0])], (250))
        f2 = lambda x: (x < 0) + 1
        accuracy = np.sum(labels == f2(res)) / 250 * 100
        
        self.assertTrue(accuracy > 98)

    def test_using_predict(self):
        """
        Test the algorithm using the predict function.
        With builtin classification
        """
        [X, labels, Y] = self.gen_data()
        # Call algorithm
        bias = multiLogReg(Matrix(self.sds,X),Matrix(self.sds,Y)).compute()

        [m, y_pred, acc] = multiLogRegPredict(Matrix(self.sds,X),Matrix(self.sds,bias), Matrix(self.sds,Y)).compute()

        self.assertTrue(acc > 98)

    
    def gen_data(self):
        np.random.seed(13241)
        # Generate data
        mu, sigma = 1, 0.1
        X = np.reshape(np.random.normal(mu, sigma,  500), (2,250))
        # All over 1 is true
        f = lambda x: (x[0] > 1) + 1
        labels = f(X)
        # Y labels as double
        Y = np.array(labels, dtype=np.double)
        # Transpose X to fit input format.
        X = X.transpose()
        return X, labels, Y

if __name__ == "__main__":
    unittest.main(exit=False)