example/gluon/lipnet/tests/test_beamsearch.py

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"""it is the test for the decode using beam search
Ref:
https://github.com/ThomasDelteil/HandwrittenTextRecognition_MXNet/blob/master/utils/CTCDecoder/BeamSearch.py
"""

import unittest
import numpy as np
from BeamSearch import ctcBeamSearch

class TestBeamSearch(unittest.TestCase):
    """Test Beam Search
    """
    def test_ctc_beam_search(self):
        "test decoder"
        classes = 'ab'
        mat = np.array([[0.4, 0, 0.6], [0.4, 0, 0.6]])
        print('Test beam search')
        expected = 'a'
        actual = ctcBeamSearch(mat, classes, None, k=2, beamWidth=3)[0]
        print('Expected: "' + expected + '"')
        print('Actual: "' + actual + '"')
        self.assertEqual(expected, actual)

if __name__ == '__main__':
    unittest.main()