[Fix] Fix the bug of large seg map IoU calculation #534
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This PR is realated to #523.
Problem statement
torch.histc
may meet a trouble when inputting large size seg map.torch.histc
may only be able to count 2^24. When pixels of single class exceed 2^24,torch.histc
can't count exceeded part.Fix
We change
torch.histc
totorch.bincount
when counting pixels of each class.Others
torch.bincount
can only support 1-d non-negative integral inputs. Besides, the inference speed oftorch.bincount
is slower thantorch.histc