def test_output_of_transformer():
X = _make_nested_from_array(np.array([4, 6, 10, 12, 8, 6, 5, 5]),
n_instances=1,
n_columns=1)
s = SlopeTransformer(num_intervals=2).fit(X)
res = s.transform(X)
orig = convert_list_to_dataframe([[(5 + math.sqrt(41)) / 4,
(1 + math.sqrt(101)) / -10]])
orig.columns = X.columns
assert check_if_dataframes_are_equal(res, orig)
X = _make_nested_from_array(np.array(
[-5, 2.5, 1, 3, 10, -1.5, 6, 12, -3, 0.2]),
n_instances=1,
n_columns=1)
s = s.fit(X)
res = s.transform(X)
orig = convert_list_to_dataframe([[
(104.8 + math.sqrt(14704.04)) / 61,
(143.752 + math.sqrt(20790.0775)) / -11.2,
]])
orig.columns = X.columns
assert check_if_dataframes_are_equal(res, orig)
def test_bad_input_args(bad_num_intervals):
X = _make_nested_from_array(np.ones(10), n_instances=10, n_columns=1)
if not isinstance(bad_num_intervals, int):
with pytest.raises(TypeError):
SlopeTransformer(
num_intervals=bad_num_intervals).fit(X).transform(X)
else:
with pytest.raises(ValueError):
SlopeTransformer(
num_intervals=bad_num_intervals).fit(X).transform(X)
def test_bad_input_args(bad_num_intervals):
X = generate_df_from_array(np.ones(10), n_rows=10, n_cols=1)
if not isinstance(bad_num_intervals, int):
with pytest.raises(TypeError):
SlopeTransformer(num_intervals=bad_num_intervals) \
.fit(X).transform(X)
else:
with pytest.raises(ValueError):
SlopeTransformer(num_intervals=bad_num_intervals) \
.fit(X).transform(X)
def test_slope_performs_correcly_along_each_dim():
X = generate_df_from_array(np.array([4, 6, 10, 12, 8, 6, 5, 5]),
n_rows=1, n_cols=2)
s = SlopeTransformer(num_intervals=2).fit(X)
res = s.transform(X)
orig = convert_list_to_dataframe([[(5+math.sqrt(41))/4,
(1+math.sqrt(101))/-10],
[(5+math.sqrt(41))/4,
(1+math.sqrt(101))/-10]])
orig.columns = X.columns
assert check_if_dataframes_are_equal(res, orig)
def test_output_dimensions(num_intervals, corr_series_length):
X = _make_nested_from_array(np.ones(13), n_instances=10, n_columns=1)
s = SlopeTransformer(num_intervals=num_intervals).fit(X)
res = s.transform(X)
# get the dimension of the generated dataframe.
act_time_series_length = res.iloc[0, 0].shape[0]
num_rows = res.shape[0]
num_cols = res.shape[1]
assert act_time_series_length == corr_series_length
assert num_rows == 10
assert num_cols == 1
def _get_transformer(self, tName):
"""
Function to extract the appropriate transformer
Parameters
-------
self : the ShapeDTW object.
tName : the name of the required transformer.
Returns
-------
output : Base Transformer object corresponding to the class
(or classes if its a compound transformer) of the
required transformer. The transformer is
configured with the parameters given in self.metric_params.
throws : ValueError if a shape descriptor doesn't exist.
"""
parameters = self.metric_params
tName = tName.lower()
if parameters is None:
parameters = {}
parameters = {k.lower(): v for k, v in parameters.items()}
self._check_metric_params(parameters)
if tName == "raw":
return None
elif tName == "paa":
num_intervals = parameters.get("num_intervals_paa")
if num_intervals is None:
return PAA()
return PAA(num_intervals)
elif tName == "dwt":
num_levels = parameters.get("num_levels_dwt")
if num_levels is None:
return DWTTransformer()
return DWTTransformer(num_levels)
elif tName == "slope":
num_intervals = parameters.get("num_intervals_slope")
if num_intervals is None:
return SlopeTransformer()
return SlopeTransformer(num_intervals)
elif tName == "derivative":
return DerivativeSlopeTransformer()
elif tName == "hog1d":
num_intervals = parameters.get("num_intervals_hog1d")
num_bins = parameters.get("num_bins_hog1d")
scaling_factor = parameters.get("scaling_factor_hog1d")
# All 3 paramaters are None
if num_intervals is None and num_bins is None and \
scaling_factor is None:
return HOG1DTransformer()
# 2 parameters are None
if num_intervals is None and num_bins is None:
return HOG1DTransformer(scaling_factor=scaling_factor)
if num_intervals is None and scaling_factor is None:
return HOG1DTransformer(num_bins=num_bins)
if num_bins is None and scaling_factor is None:
return HOG1DTransformer(num_intervals=num_intervals)
# 1 parameter is None
if num_intervals is None:
return HOG1DTransformer(scaling_factor=scaling_factor,
num_bins=num_bins)
if scaling_factor is None:
return HOG1DTransformer(num_intervals=num_intervals,
num_bins=num_bins)
if num_bins is None:
return HOG1DTransformer(scaling_factor=scaling_factor,
num_intervals=num_intervals)
# All parameters are given
return HOG1DTransformer(num_intervals=num_intervals,
num_bins=num_bins,
scaling_factor=scaling_factor)
else:
raise ValueError("Invalid shape desciptor function.")