AttributeError: 'Explanation' object has no attribute '_old_format'

[JSybrandt]

Hit an error while testing shap:

Code:

explainer = shap.PermutationExplainer(model.predict, shap.maskers.Independent(observation_df, max_samples=10))
shap_values = explainer.shap_values(observation_df, npermutations=5, silent=True)

Causes:

AttributeError: 'Explanation' object has no attribute '_old_format'

Error at line:
https://github.com/slundberg/shap/blob/491d46a540d16fb5a9868de6be2913599c850167/shap/explainers/_permutation.py#L135

[zwag20]

I am receiving the same error, has this been addressed?

[thomastskng]

I ran into the same issue as well when using shap.PermutationExplainer and try to compute the shap_values. Is this being fixed ?

[ThomasWolf0701]

Also getting the same error with scikit catboost model.

localExplainer = shap.PermutationExplainer(bestModel["m"].predict,transformedMatrix.iloc[:,0:2214])# masker, link=CPUDispatcher())

localExplainer.shap_values(transformedMatrix.iloc[1:2,0:2214])
Permutation explainer: 2it [00:16, 16.16s/it]
Traceback (most recent call last):

File "", line 1, in
localExplainer.shap_values(transformedMatrix.iloc[1:2,0:2214])

File "C:\Users\Thomas Wolf\anaconda3\envs\ChemPipeline\lib\site-packages\shap\explainers_permutation.py", line 155, in shap_values
return explanation._old_format()

AttributeError: 'Explanation' object has no attribute '_old_format'

[mmdfl]

Same error here... My code:
explainer = shap.Explainer(model.predict, X_train)
shap_values = explainer.shap_values(X_test.sample(n=100, random_state=1))

Error:
Permutation explainer: 101it [01:42, 1.12s/it]
AttributeError Traceback (most recent call last)
in
----> 1 shap_values = explainer.shap_values(X_test.sample(n=100, random_state=1))

c:\python38\lib\site-packages\shap\explainers_permutation.py in shap_values(self, X, npermutations, main_effects, error_bounds, batch_evals, silent)
139
140 explanation = self(X, max_evals=npermutations * X.shape[1], main_effects=main_effects)
--> 141 return explanation._old_format()
142
143

AttributeError: 'Explanation' object has no attribute '_old_format'

If you are using RandomForest as model, inside a pipeline, like me, this could help:

#1373 (comment)

[NatiSN]

I removed the method ._old_format() and that solved the problem so it looks like

return explanation

[leoschet]

For shap.Explainer getting the shap values by calling the explainer directly solved for me. To be clear:

explainer = shap.Explainer(model.predict, X)
shap_values = explainer(X)

[ursulalujun]

explainer = shap.explainers.Permutation(f, X)
shap_values = explainer(X)

Replacing with the code above, you will get an explanation with this format as
`.values =
array([-0.00857, -0.00452, -0.00724, -0.0065 , -0.00375, -0.00324,
-0.00152, -0.00787, -0.00562, -0.009 ])

.base_values =
array([62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848,
62.848, 62.848])

.data =
array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])`

then use shap_values = shap_values.values to obtain shap_values

[thomastskng]

explainer = shap.explainers.Permutation(f, X)
shap_values = explainer(X)

Replacing with the code above, you will get an explanation with this format as `.values = array([-0.00857, -0.00452, -0.00724, -0.0065 , -0.00375, -0.00324, -0.00152, -0.00787, -0.00562, -0.009 ])

.base_values = array([62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848, 62.848])

.data = array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])`

then use shap_values = shap_values.values to obtain shap_values

Thanks for the code. My only question would be how do i set the npermutations to a different value here ?

[AstrosiosaurQ7]

I removed the method ._old_format() and that solved the problem so it looks like

return explanation

hi I got same question, and I'm not sure how to remove the methon. Would you mind to explain a little more specific? T.T