src/main/python/tests/matrix/test_slice.py

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import unittest

import numpy as np
from systemds.context import SystemDSContext

# Seed the randomness.
np.random.seed(7)

m = np.random.rand(3, 4)


class TestFederatedAggFn(unittest.TestCase):

    sds: SystemDSContext = None

    @classmethod
    def setUpClass(cls):
        cls.sds = SystemDSContext(capture_stdout=True, logging_level=50)

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

    def test_setup(self):
        sm = self.sds.from_numpy(m)
        sr = sm.compute()
        e = m
        self.assertTrue(np.allclose(e, sr))

    def test_slice_first_third_row(self):
        sm = self.sds.from_numpy(m)[[0, 2]]
        sr = sm.compute()
        e = m[[0, 2]]
        self.assertTrue(np.allclose(e, sr))

    def test_slice_single_row(self):
        sm = self.sds.from_numpy(m)[[1]]
        sr = sm.compute()
        e = m[[1]]
        self.assertTrue(np.allclose(e, sr))

    def test_slice_last_row(self):
        with self.assertRaises(ValueError):
            self.sds.from_numpy(m)[[-1]]

    def test_slice_first_third_col(self):
        sm = self.sds.from_numpy(m)[:, [0, 2]]
        sr = sm.compute()
        e = m[:, [0, 2]]
        self.assertTrue(np.allclose(e, sr))

    def test_slice_single_col(self):
        sm = self.sds.from_numpy(m)[:, [1]]
        sr = sm.compute()
        e = m[:, [1]]
        self.assertTrue(np.allclose(e, sr))

    def test_slice_row_col_both(self):
        with self.assertRaises(NotImplementedError):
            self.sds.from_numpy(m)[[1, 2], [0, 3]]


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