def test_sample_empty_transformed_conditions():
"""Test that None is passed to ``_sample_batch`` if transformed conditions are empty.
The ``Sample`` method is expected to:
- Return sampled data and pass None to ``sample_batch`` as the
``transformed_conditions``.
Input:
- Number of rows to sample
- Conditions
Output:
- Sampled data
"""
# Setup
model = GaussianCopula()
data = pd.DataFrame({
'column1': list(range(100)),
'column2': list(range(100)),
'column3': list(range(100))
})
conditions = {'column1': 25}
conditions_series = pd.Series([25, 25, 25, 25, 25], name='column1')
model._sample_batch = Mock()
sampled = pd.DataFrame({
'column1': [28, 28],
'column2': [37, 37],
'column3': [93, 93],
})
model._sample_batch.return_value = sampled
model.fit(data)
model._metadata = Mock()
model._metadata.get_fields.return_value = ['column1', 'column2', 'column3']
model._metadata.transform.return_value = pd.DataFrame()
model._metadata.make_ids_unique.side_effect = lambda x: x
# Run
output = model.sample(5,
conditions=conditions,
graceful_reject_sampling=True)
# Assert
expected_output = pd.DataFrame({
'column1': [28, 28],
'column2': [37, 37],
'column3': [93, 93],
})
_, args, kwargs = model._metadata.transform.mock_calls[0]
pd.testing.assert_series_equal(args[0]['column1'], conditions_series)
assert kwargs['on_missing_column'] == 'drop'
model._metadata.transform.assert_called_once()
model._sample_batch.assert_called_with(5, 100, 10, conditions, None, 0.01)
pd.testing.assert_frame_equal(output, expected_output)
def test__sample_rows_previous_rows_appended_correctly():
"""Test the ``BaseTabularModel._sample_rows`` method.
If ``_sample_rows`` is passed ``previous_rows``, then it
should reset the index when appending them to the new
sampled rows.
Input:
- num_rows is 5
- previous_rows is a DataFrame of 3 existing rows.
Output:
- 5 sampled rows with index set to [0, 1, 2, 3, 4]
"""
# Setup
model = GaussianCopula()
previous_data = pd.DataFrame({
'column1': [1, 2, 3],
'column2': [4, 5, 6],
'column3': [7, 8, 9]
})
new_data = pd.DataFrame({
'column1': [4, 5],
'column2': [7, 8],
'column3': [10, 11]
})
model._metadata = Mock()
model._sample = Mock()
model._sample.return_value = new_data
model._metadata.reverse_transform.return_value = new_data
model._metadata.filter_valid = lambda x: x
# Run
sampled, num_valid = model._sample_rows(5, previous_rows=previous_data)
# Assert
expected = pd.DataFrame({
'column1': [1, 2, 3, 4, 5],
'column2': [4, 5, 6, 7, 8],
'column3': [7, 8, 9, 10, 11]
})
assert num_valid == 5
pd.testing.assert_frame_equal(sampled, expected)
def test_sample_batches_transform_conditions_correctly():
"""Test that transformed conditions are batched correctly.
The ``Sample`` method is expected to:
- Return sampled data and call ``_sample_batch`` for every unique transformed
condition group.
Input:
- Number of rows to sample
- Conditions
Output:
- Sampled data
"""
# Setup
model = GaussianCopula()
data = pd.DataFrame({
'column1': list(range(100)),
'column2': list(range(100)),
'column3': list(range(100))
})
conditions = {'column1': [25, 25, 25, 30, 30]}
conditions_series = pd.Series([25, 25, 25, 30, 30], name='column1')
model._sample_batch = Mock()
expected_outputs = [
pd.DataFrame({
'column1': [25, 25, 25],
'column2': [37, 37, 37],
'column3': [93, 93, 93],
}),
pd.DataFrame({
'column1': [30],
'column2': [37],
'column3': [93],
}),
pd.DataFrame({
'column1': [30],
'column2': [37],
'column3': [93],
})
]
model._sample_batch.side_effect = expected_outputs
model.fit(data)
model._metadata = Mock()
model._metadata.get_fields.return_value = ['column1', 'column2', 'column3']
model._metadata.transform.return_value = pd.DataFrame(
[[50], [50], [50], [60], [70]], columns=['transformed_column'])
# Run
model.sample(5, conditions=conditions, graceful_reject_sampling=True)
# Assert
_, args, kwargs = model._metadata.transform.mock_calls[0]
pd.testing.assert_series_equal(args[0]['column1'], conditions_series)
assert kwargs['on_missing_column'] == 'drop'
model._metadata.transform.assert_called_once()
model._sample_batch.assert_any_call(3, 100, 10, {'column1': 25},
{'transformed_column': 50}, 0.01)
model._sample_batch.assert_any_call(1, 100, 10, {'column1': 30},
{'transformed_column': 60}, 0.01)
model._sample_batch.assert_any_call(1, 100, 10, {'column1': 30},
{'transformed_column': 70}, 0.01)
