API don't default get_params output to None in the future #14464
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jnothman
reviewed
Jul 25, 2019
| @@ -127,9 +127,9 @@ class Pipeline(_BaseComposition): | |||
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| def __init__(self, steps, memory=None, verbose=False): | |||
| self.steps = steps | |||
| self._validate_steps() | |||
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This was calling get_params before all attributes were set.
jnothman
reviewed
Jul 25, 2019
| pass | ||
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| def fit(self, X, y=None): | ||
| return self |
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Coverage is missing on lines like this, which I think is fine.
| return X | ||
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| def diag(self, X): | ||
| return np.ones(X.shape[0]) |
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Coverage is missing on lines like this, which I think is fine.
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Even if affected users will see the warning maybe it's also worth adding a what's new entry? |
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Reference Issues/PRs
Fixes #14461
What does this implement/fix? Explain your changes.
Previously, the default implementation of
get_paramswould usegetattrto retrieve a parameter value from an estimator, but would default to retrieve None if an AttributeError would otherwise have been raised.This can lead to surprising behaviour upon
clonewhen__init__is not correctly defined, as shown in #14461.I propose that we raise an AttributeError when a param cannot be retrieved by
getattr. This PR deprecates returning None, and raises a FutureWarning.Any other comments?
TODO: add tests