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1 change: 1 addition & 0 deletions obsidian/parameters/transforms.py
Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@ def forward(self,
self._validate_fit()
if self.params["sd"] == 0:
# In the edge case where `X` is degenerate, avoid 0 divided by 0
warnings.warn('Transform constant target values by mean subtraction', UserWarning)
return zeros_like(X)
else:
return (X-self.params['mu'])/self.params['sd']
Expand Down
13 changes: 11 additions & 2 deletions obsidian/tests/test_parameters.py
Original file line number Diff line number Diff line change
Expand Up @@ -255,7 +255,16 @@ def test_target_validation():
with pytest.warns(UserWarning):
transform_func = Logit_Scaler(range_response=100)
transform_func.forward(test_neg_response, fit=False)



# Transform constant target values
test_constant_response = torch.zeros(10) + 9.0
with pytest.warns(UserWarning):
Target('Response1', f_transform='Standard').transform_f(test_constant_response, fit=True)

# Corner case for Logit_Scaler
transform_func = Logit_Scaler(standardize=False)
transform_func.forward(test_response, fit=True)


if __name__ == '__main__':
pytest.main([__file__, '-m', 'fast'])