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import unittest
import pytest
import jiwer
def all_m(wer, mer, wil):
return {
"wer": wer,
"mer": mer,
"wip": 1 - wil,
"wil": wil,
}
def to_measure_dict(x: jiwer.WordOutput):
return {"wer": x.wer, "mer": x.mer, "wip": x.wip, "wil": x.wil}
def assert_dict_almost_equal(
test_case: unittest.TestCase, a, b, places=None, msg=None, delta=None
):
test_case.assertIsInstance(a, dict)
test_case.assertIsInstance(b, dict)
test_case.assertEqual(set(a.keys()), set(b.keys()))
for k in a.keys():
test_case.assertAlmostEqual(a[k], b[k], places=places, msg=msg, delta=delta)
class TestMeasuresContiguousSentencesTransform(unittest.TestCase):
def test_input_ref_string_hyp_string(self):
cases = [
("This is a test", "This is a test", all_m(0, 0, 0)),
("This is a test", "", all_m(1, 1, 1)),
("This is a test", "This test", all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_ref_string_hyp_list(self):
cases = [
("This is a test", ["This is a test"], all_m(0, 0, 0)),
("This is a test", [""], all_m(1, 1, 1)),
("This is a test", ["This test"], all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_ref_list_hyp_string(self):
cases = [
(["This is a test"], "This is a test", all_m(0, 0, 0)),
(["This is a test"], "", all_m(1, 1, 1)),
(["This is a test"], "This test", all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_ref_list_hyp_list(self):
cases = [
(["This is a test"], ["This is a test"], all_m(0, 0, 0)),
(["This is a test"], [""], all_m(1, 1, 1)),
(["This is a test"], ["This test"], all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_different_sentence_length_equal_type(self):
cases = [
(
["hello", "this", "sentence", "is fractured"],
["this sentence"],
all_m(0.6, 0.6, 0.6),
),
(
"i am a short ground truth",
"i am a considerably longer and very much incorrect hypothesis",
all_m(7 / 6, 0.7, 0.85),
),
]
self._apply_test_on(cases)
def test_different_sentence_length_unequaL_type(self):
reference = [
"i like monthy python",
"what do you mean african or european swallow",
]
hypothesis = ["i like", "python", "what you mean", "or swallow"]
x = jiwer.process_words(
reference,
hypothesis,
reference_transform=jiwer.transformations.wer_contiguous,
hypothesis_transform=jiwer.transformations.wer_contiguous,
)
x_dict = to_measure_dict(x)
# is equivalent to
reference = "i like monthy python what do you mean african or european swallow"
hypothesis = "i like python what you mean or swallow"
y = jiwer.process_words(
reference,
hypothesis,
reference_transform=jiwer.transformations.wer_contiguous,
hypothesis_transform=jiwer.transformations.wer_contiguous,
)
y_dict = to_measure_dict(y)
assert_dict_almost_equal(self, x_dict, y_dict, delta=1e-9)
def test_fail_on_empty_reference(self):
for method in [
jiwer.wer,
jiwer.wil,
jiwer.wip,
jiwer.mer,
jiwer.compute_measures,
]:
def callback():
method("", "test")
self.assertRaises(ValueError, callback)
def test_known_values(self):
# Taken from the "From WER and RIL to MER and WIL" paper, for link see README.md
cases = [
(
"X",
"X",
all_m(0, 0, 0),
),
(
"X",
"X X Y Y",
all_m(3, 0.75, 0.75),
),
(
"X Y X",
"X Z",
all_m(2 / 3, 2 / 3, 5 / 6),
),
(
"X",
"Y",
all_m(1, 1, 1),
),
(
"X",
"Y Z",
all_m(2, 1, 1),
),
]
self._apply_test_on(cases)
def test_permutations_variance(self):
cases = [
(
["i", "am i good"],
["i am", "i good"],
all_m(0.0, 0.0, 0),
),
(
["am i good", "i"],
[
"i good",
"i am",
],
all_m(0.5, 0.4, 7 / 16),
),
]
self._apply_test_on(cases)
def _apply_test_on(self, cases):
for ref, hyp, correct_measures in cases:
output = jiwer.process_words(
reference=ref,
hypothesis=hyp,
reference_transform=jiwer.transformations.wer_contiguous,
hypothesis_transform=jiwer.transformations.wer_contiguous,
)
output_dict = to_measure_dict(output)
assert_dict_almost_equal(self, output_dict, correct_measures, delta=1e-16)
class TestMeasuresDefaultTransform(unittest.TestCase):
def test_input_gt_string_h_string(self):
cases = [
("This is a test", "This is a test", all_m(0, 0, 0)),
("This is a test", "", all_m(1, 1, 1)),
("This is a test", "This test", all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_gt_string_h_list(self):
cases = [
("This is a test", ["This is a test"], all_m(0, 0, 0)),
("This is a test", [""], all_m(1, 1, 1)),
("This is a test", ["This test"], all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_gt_list_h_string(self):
cases = [
(["This is a test"], "This is a test", all_m(0, 0, 0)),
(["This is a test"], "", all_m(1, 1, 1)),
(["This is a test"], "This test", all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_input_gt_list_h_list(self):
cases = [
(["This is a test"], ["This is a test"], all_m(0, 0, 0)),
(["This is a test"], [""], all_m(1, 1, 1)),
(["This is a test"], ["This test"], all_m(0.5, 0.5, 0.5)),
]
self._apply_test_on(cases)
def test_fail_on_different_sentence_length(self):
for method in [
jiwer.process_words,
jiwer.wer,
jiwer.wil,
jiwer.wip,
jiwer.mer,
jiwer.compute_measures,
]:
def callback():
method(["hello", "this", "sentence", "is fractured"], ["this sentence"])
self.assertRaises(ValueError, callback)
def test_fail_on_empty_reference(self):
for method in [
jiwer.process_words,
jiwer.wer,
jiwer.wil,
jiwer.wip,
jiwer.mer,
jiwer.compute_measures,
]:
def callback():
method("", "test")
self.assertRaises(ValueError, callback)
def test_known_values(self):
# Taken from the "From WER and RIL to MER and WIL" paper, for link see README.md
cases = [
(
"X",
"X",
all_m(0, 0, 0),
),
(
"X",
"X X Y Y",
all_m(3, 0.75, 0.75),
),
(
"X Y X",
"X Z",
all_m(2 / 3, 2 / 3, 5 / 6),
),
(
"X",
"Y",
all_m(1, 1, 1),
),
(
"X",
"Y Z",
all_m(2, 1, 1),
),
]
self._apply_test_on(cases)
def test_permutations_invariance(self):
cases = [
(
["i", "am i good"],
["i am", "i good"],
all_m(0.5, 0.4, 7 / 16),
),
(
["am i good", "i"],
[
"i good",
"i am",
],
all_m(0.5, 0.4, 7 / 16),
),
]
self._apply_test_on(cases)
def _apply_test_on(self, cases):
for ref, hyp, correct_measures in cases:
output = jiwer.process_words(reference=ref, hypothesis=hyp)
output_dict = to_measure_dict(output)
assert_dict_almost_equal(self, output_dict, correct_measures, delta=1e-16)
with pytest.deprecated_call():
output = jiwer.compute_measures(truth=ref, hypothesis=hyp)
output_dict = {
"wer": output["wer"],
"mer": output["mer"],
"wil": output["wil"],
"wip": output["wip"],
}
assert_dict_almost_equal(
self, output_dict, correct_measures, delta=1e-16
)
self._apply_test_deprecated_truth(cases)
def _apply_test_deprecated_truth(self, cases):
with pytest.deprecated_call():
for ref, hyp, correct_measures in cases:
output_dict = {}
for key, method in [
("wer", jiwer.wer),
("mer", jiwer.mer),
("wil", jiwer.wil),
("wip", jiwer.wip),
]:
output = method(truth=ref, hypothesis=hyp)
output_dict[key] = output
assert_dict_almost_equal(
self, output_dict, correct_measures, delta=1e-16
)
def test_deprecated_truth_and_ref(self):
for key, method in [
("wer", jiwer.wer),
("mer", jiwer.mer),
("wil", jiwer.wil),
("wip", jiwer.wip),
("cer", jiwer.cer),
]:
with pytest.raises(ValueError):
method(truth="ref", reference="truth", hypothesis="huh")
method()
method(truth="only truth")
method(reference="only ref")
method(hypothesis="only hypothesis")
def test_deprecated_truth_and_ref_with_transform(self):
wer_transform = jiwer.Compose(
[
jiwer.ToLowerCase(),
jiwer.RemoveMultipleSpaces(),
jiwer.Strip(),
jiwer.ReduceToListOfListOfWords(),
]
)
cer_transform = jiwer.Compose(
[
jiwer.ToLowerCase(),
jiwer.RemoveMultipleSpaces(),
jiwer.Strip(),
jiwer.ReduceToListOfListOfChars(),
]
)
for key, method in [
("wer", jiwer.wer),
("mer", jiwer.mer),
("wil", jiwer.wil),
("wip", jiwer.wip),
("cer", jiwer.cer),
]:
if key == "cer":
tr = cer_transform
else:
tr = wer_transform
result = method(
truth="This is a short Sentence with a few Words with upper and Lower cases",
hypothesis="His is a short Sentence with a few Words with upper and Lower cases",
truth_transform=tr,
hypothesis_transform=tr,
)
result_same = method(
reference="This is a short Sentence with a few Words with upper and Lower cases",
hypothesis="His is a short Sentence with a few Words with upper and Lower cases",
reference_transform=tr,
hypothesis_transform=tr,
)
self.assertAlmostEqual(result, result_same)
def test_deprecate_compute_measures():
# TODO: remove once deprecated
with pytest.deprecated_call():
jiwer.compute_measures("no more", "compute_measures")
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