def test_calculate_one_way_likelihood_bigram_and_target_comes_before(self):
mock_context_item_0 = mock()
context = [mock_context_item_0]
target = mock()
wrapped_calculator = mock()
calculation_context = None
when(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_0], False,
calculation_context).thenReturn(0.5)
interpolating_calculator = InterpolatingLikelihoodCalculator(
wrapped_calculator)
interpolated_likelihood = interpolating_calculator.calculate_oneway_likelihood(
target, context, False, calculation_context)
assert_that(interpolated_likelihood, equal_to(0.5))
verify(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_0], False, calculation_context)
verifyNoMoreInteractions(wrapped_calculator)
def test_calculate_one_way_likelihood_4gram_and_target_comes_after(self):
# not practical but just try
mock_context_item_0 = mock()
mock_context_item_1 = mock()
mock_context_item_2 = mock()
context = [mock_context_item_0, mock_context_item_1, mock_context_item_2]
target = mock()
wrapped_calculator = mock()
calculation_context = None
when(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_2], True, calculation_context).thenReturn(0.5)
when(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_1, mock_context_item_2], True, calculation_context).thenReturn(0.2)
when(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_0, mock_context_item_1, mock_context_item_2], True,
calculation_context).thenReturn(0.05)
interpolating_calculator = InterpolatingLikelihoodCalculator(wrapped_calculator)
interpolated_likelihood = interpolating_calculator.calculate_oneway_likelihood(target, context, True, calculation_context)
assert_that(interpolated_likelihood, equal_to(0.5 * 1 / 111 + 0.2 * 10 / 111 + 0.05 * 100 / 111))
verify(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_2], True, calculation_context)
verify(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_1, mock_context_item_2], True, calculation_context)
verify(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_0, mock_context_item_1, mock_context_item_2], True,
calculation_context)
verifyNoMoreInteractions(wrapped_calculator)
def test_calculate_one_way_likelihood_trigram_and_target_comes_after(self):
mock_context_item_0 = mock()
mock_context_item_1 = mock()
context = [mock_context_item_0, mock_context_item_1]
target = mock()
wrapped_calculator = mock()
calculation_context = None
when(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_1], True,
calculation_context).thenReturn(0.5)
when(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_0, mock_context_item_1], True,
calculation_context).thenReturn(0.2)
interpolating_calculator = InterpolatingLikelihoodCalculator(
wrapped_calculator)
interpolated_likelihood = interpolating_calculator.calculate_oneway_likelihood(
target, context, True, calculation_context)
assert_that(interpolated_likelihood,
equal_to(0.5 * 1 / 11 + 0.2 * 10 / 11))
verify(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_1], True, calculation_context)
verify(wrapped_calculator).calculate_oneway_likelihood(
target, [mock_context_item_0, mock_context_item_1], True,
calculation_context)
verifyNoMoreInteractions(wrapped_calculator)
def test_calculate_one_way_likelihood_bigram_and_target_comes_before(self):
mock_context_item_0 = mock()
context = [mock_context_item_0]
target = mock()
wrapped_calculator = mock()
calculation_context = None
when(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_0], False, calculation_context).thenReturn(0.5)
interpolating_calculator = InterpolatingLikelihoodCalculator(wrapped_calculator)
interpolated_likelihood = interpolating_calculator.calculate_oneway_likelihood(target, context, False, calculation_context)
assert_that(interpolated_likelihood, equal_to(0.5))
verify(wrapped_calculator).calculate_oneway_likelihood(target, [mock_context_item_0], False, calculation_context)
verifyNoMoreInteractions(wrapped_calculator)
