Update confusion_matrix.py #3755
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The current implementation do not work correctly when num_classes is larger than 16. Because the gt seg map was forced to uint8 dtype.
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Motivation
The current implementation do not work correctly when num_classes is larger than 16. Because the gt seg map was forced to uint8 dtype.
Modification
Let gt seg map being np.uint32, rather than uint8 for no reason. The function works fine after the modification.