Could anyone explain how to reduce BCELoss with weight for positive targets described in issues to multiplication as @smth proposed? I’ve tried to use vectors as weights and other tricks but these approaches are too complex. It’s quite important for my current project. I’ve implemented a class for it but if there is simpler way it would be great. 
this is my mistake to not have re-visited earlier. I’ve posted on the original issue and revisited.
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