TypeError: object of type 'numpy.int64' has no len() / TypeError: object of type 'int' has no len()/ while using classification_report in scikitlearn

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Sometimes when using sklearn.metrics.classification_report we get below error

TypeError: object of type 'int' has no len()

Sometime depending on the datatype we get error like below too

TypeError: object of type 'numpy.int64' has no len()

Sample code when we might get this error

t=pd.Series([1,2,3,4])
p=np.asarray([1,2,3,4])
target_names=[1,2,3,4]
print(classification_report(t, p, target_names=target_names))
scikit-learn metrics python-3.x
1 Answers

This happens when target_names used are not string; to solve did a conversion like below on the target_names variable

t=pd.Series([1,2,3,4])
p=np.asarray([1,2,3,4])
target_names=[1,2,3,4]
target_names=list(map(str,target_names))
print(classification_report(t, p, target_names=target_names))
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