def test_targetvalidator_inversetransform():
"""
Test that the encoding/decoding works in 1D
"""
validator = TargetValidator(is_classification=True)
validator.fit(
pd.DataFrame(data=['a', 'a', 'b', 'c', 'a'], dtype='category'),
)
y = validator.transform(
pd.DataFrame(data=['a', 'a', 'b', 'c', 'a'], dtype='category'),
)
np.testing.assert_array_almost_equal(np.array([0, 0, 1, 2, 0]), y)
y_decoded = validator.inverse_transform(y)
assert ['a', 'a', 'b', 'c', 'a'] == y_decoded.tolist()
assert validator.classes_.tolist() == ['a', 'b', 'c']
validator = TargetValidator(is_classification=True)
multi_label = pd.DataFrame(
np.array([[1, 0, 0, 1], [0, 0, 1, 1], [0, 0, 0, 0]]),
dtype=bool
)
validator.fit(multi_label)
y = validator.transform(multi_label)
y_decoded = validator.inverse_transform(y)
np.testing.assert_array_almost_equal(y, y_decoded)
# Multilabel classification is not encoded
# For this reason, classes_ attribute does not contain a class
np.testing.assert_array_almost_equal(validator.classes_, np.array([]))
def test_targetvalidator_inversetransform():
"""
Test that the encoding/decoding works in 1D
"""
validator = TargetValidator(is_classification=True)
validator.fit(
pd.DataFrame(data=['a', 'a', 'b', 'c', 'a'], dtype='category'),
)
y = validator.transform(
pd.DataFrame(data=['a', 'a', 'b', 'c', 'a'], dtype='category'),
)
np.testing.assert_array_almost_equal(np.array([0, 0, 1, 2, 0]), y)
y_decoded = validator.inverse_transform(y)
assert ['a', 'a', 'b', 'c', 'a'] == y_decoded.tolist()
validator = TargetValidator(is_classification=True)
multi_label = pd.DataFrame(
np.array([[1, 0, 0, 1], [0, 0, 1, 1], [0, 0, 0, 0]]),
dtype=bool
)
validator.fit(multi_label)
y = validator.transform(multi_label)
y_decoded = validator.inverse_transform(y)
np.testing.assert_array_almost_equal(y, y_decoded)
def test_target_unsupported():
"""
Makes sure we raise a proper message to the user,
when providing not supported data input
"""
validator = TargetValidator(is_classification=True)
with pytest.raises(ValueError, match=r"The dimensionality of the train and test targets"):
validator.fit(
np.array([[0, 1, 0], [0, 1, 1]]),
np.array([[0, 1, 0, 0], [0, 1, 1, 1]]),
)
with pytest.raises(ValueError, match=r"Train and test targets must both have the same dtypes"):
validator.fit(
pd.DataFrame({'a': [1, 2, 3]}),
pd.DataFrame({'a': [True, False, False]}),
)
with pytest.raises(ValueError, match=r"Provided targets are not supported.*"):
validator.fit(
np.array([[0, 1, 2], [0, 3, 4]]),
np.array([[0, 1, 2, 5], [0, 3, 4, 6]]),
)
with pytest.raises(ValueError, match="Train and test targets must both have the same"):
validator.fit(
pd.DataFrame({'string': ['foo']}),
pd.DataFrame({'int': [1]}),
)
with pytest.raises(ValueError, match=r"Auto-sklearn only supports Numpy arrays, .*"):
validator.fit({'input1': 1, 'input2': 2})
with pytest.raises(ValueError, match=r"arget values cannot contain missing/NaN values"):
validator.fit(np.array([np.nan, 1, 2]))
with pytest.raises(ValueError, match=r"arget values cannot contain missing/NaN values"):
validator.fit(sparse.csr_matrix(np.array([1, 2, np.nan])))
with pytest.raises(ValueError, match=r"Cannot call transform on a validator that is not fit"):
validator.transform(np.array([1, 2, 3]))
with pytest.raises(ValueError, match=r"Cannot call inverse_transform on a validator that is"):
validator.inverse_transform(np.array([1, 2, 3]))
with pytest.raises(ValueError, match=r"Multi-dimensional classification is not yet supported"):
validator._fit(np.array([[1, 2, 3], [1, 5, 6]]))
# Dia/ DOK are not supported as type of target makes calls len on the array
# which causes TypeError: len() of unsized object. Basically, sparse data as
# multi-label is the only thing that makes sense in this format.
with pytest.raises(ValueError, match=r"The provided data could not be interpreted by Sklearn"):
validator.fit(sparse.dia_matrix(np.array([1, 2, 3])))
validator.fit(np.array([[0, 1, 0], [0, 1, 1]]))
with pytest.raises(ValueError, match=r"Number of outputs changed from"):
validator.fit(np.array([0, 1, 0]))
def test_targetvalidator_supported_types_classification(input_data_targettest):
validator = TargetValidator(is_classification=True)
validator.fit(input_data_targettest)
transformed_y = validator.transform(input_data_targettest)
if sparse.issparse(input_data_targettest):
assert sparse.issparse(transformed_y)
else:
assert isinstance(transformed_y, np.ndarray)
epected_shape = np.shape(input_data_targettest)
if len(epected_shape) > 1 and epected_shape[1] == 1:
# The target should have (N,) dimensionality instead of (N, 1)
epected_shape = (epected_shape[0], )
assert epected_shape == np.shape(transformed_y)
assert np.issubdtype(transformed_y.dtype, np.number)
assert validator._is_fitted
# Because there is no classification, we do not expect a encoder
if not sparse.issparse(input_data_targettest):
assert validator.encoder is not None
# The encoding should be per column
if len(transformed_y.shape) == 1:
assert np.min(transformed_y) == 0
assert np.max(transformed_y) == len(np.unique(transformed_y)) - 1
else:
for col in range(transformed_y.shape[1]):
assert np.min(transformed_y[:, col]) == 0
assert np.max(transformed_y[:, col]) == len(np.unique(transformed_y[:, col])) - 1
# Make sure we can perform inverse transform
y_inverse = validator.inverse_transform(transformed_y)
if hasattr(input_data_targettest, 'dtype'):
# In case of numeric, we need to make sure dtype is preserved
if is_numeric_dtype(input_data_targettest.dtype):
assert y_inverse.dtype == input_data_targettest.dtype
# Then make sure every value is properly inverse-transformed
np.testing.assert_array_equal(np.array(y_inverse), np.array(input_data_targettest))
elif hasattr(input_data_targettest, 'dtypes'):
if is_numeric_dtype(input_data_targettest.dtypes[0]):
assert y_inverse.dtype == input_data_targettest.dtypes[0]
# Then make sure every value is properly inverse-transformed
np.testing.assert_array_equal(np.array(y_inverse),
# pandas is always (N, 1) but targets are ravel()
input_data_targettest.to_numpy().reshape(-1))
else:
# Sparse is not encoded, mainly because the sparse data is expected
# to be numpy of numerical type -- which currently does not require encoding
np.testing.assert_array_equal(
np.ravel(input_data_targettest.todense()),
np.ravel(transformed_y.todense())
)
