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Add tests to NgramCharModel #485

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Merged
norvig merged 1 commit into from
Apr 12, 2017
Merged

Add tests to NgramCharModel #485

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66 changes: 66 additions & 0 deletions tests/test_text.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,72 @@ def test_text_models():
assert len(P3.dictionary) == 3


def test_char_models():
test_string = 'unigram'
wordseq = words(test_string)
P1 = NgramCharModel(1, wordseq)

assert len(P1.dictionary) == len(test_string)
for char in test_string:
assert tuple(char) in P1.dictionary

test_string = 'a b c'
wordseq = words(test_string)
P1 = NgramCharModel(1, wordseq)

assert len(P1.dictionary) == len(test_string.split())
for char in test_string.split():
assert tuple(char) in P1.dictionary

test_string = 'bigram'
wordseq = words(test_string)
P2 = NgramCharModel(2, wordseq)

expected_bigrams = {(' ', 'b'): 1, ('b', 'i'): 1, ('i', 'g'): 1, ('g', 'r'): 1, ('r', 'a'): 1, ('a', 'm'): 1}

assert len(P2.dictionary) == len(expected_bigrams)
for bigram, count in expected_bigrams.items():
assert bigram in P2.dictionary
assert P2.dictionary[bigram] == count

test_string = 'bigram bigram'
wordseq = words(test_string)
P2 = NgramCharModel(2, wordseq)

expected_bigrams = {(' ', 'b'): 2, ('b', 'i'): 2, ('i', 'g'): 2, ('g', 'r'): 2, ('r', 'a'): 2, ('a', 'm'): 2}

assert len(P2.dictionary) == len(expected_bigrams)
for bigram, count in expected_bigrams.items():
assert bigram in P2.dictionary
assert P2.dictionary[bigram] == count

test_string = 'trigram'
wordseq = words(test_string)
P3 = NgramCharModel(3, wordseq)

expected_trigrams = {(' ', ' ', 't'): 1, (' ', 't', 'r'): 1, ('t', 'r', 'i'): 1,
('r', 'i', 'g'): 1, ('i', 'g', 'r'): 1, ('g', 'r', 'a'): 1,
('r', 'a', 'm'): 1}

assert len(P3.dictionary) == len(expected_trigrams)
for bigram, count in expected_trigrams.items():
assert bigram in P3.dictionary
assert P3.dictionary[bigram] == count

test_string = 'trigram trigram trigram'
wordseq = words(test_string)
P3 = NgramCharModel(3, wordseq)

expected_trigrams = {(' ', ' ', 't'): 3, (' ', 't', 'r'): 3, ('t', 'r', 'i'): 3,
('r', 'i', 'g'): 3, ('i', 'g', 'r'): 3, ('g', 'r', 'a'): 3,
('r', 'a', 'm'): 3}

assert len(P3.dictionary) == len(expected_trigrams)
for bigram, count in expected_trigrams.items():
assert bigram in P3.dictionary
assert P3.dictionary[bigram] == count


def test_viterbi_segmentation():
flatland = DataFile("EN-text/flatland.txt").read()
wordseq = words(flatland)
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