10BC0 wrong input into entropy function · Issue #14497 · scikit-learn/scikit-learn · GitHub
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wrong input into entropy function #14497

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wrong input into entropy function#14497
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module:cluster
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@minhsphuc12
minhsphuc12
opened on Jul 28, 2019

scikit-learn/sklearn/metrics/cluster/supervised.py

Line 751 in 74ae6a0

h_true, h_pred = entropy(labels_true), entropy(labels_pred)

entropy must be inputed with frequency table of labels_true / labels_pred, not those array directly.
Example solution

from collections import Counter
freq_table = [x[1] for x in dict(Counter(labels_true)).items()]
entropy(freq_table)

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