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Potential bugs:
If classes_ contains integers instead of strings the following line:
return [c + '_' + o for o in t.classes_]
would have crashed with:
TypeError: cannot concatenate 'str' and 'int' objects
.If length of classes_ is not equals to the number of output columns the following line:
return pd.DataFrame(stacked, columns=index)
would have crashed with:
Shape of passed values is (1, 3), indices imply (3, 3)
(if, for example, there are 3 classes but only 1 output column)