How to set performance weights for crossentropy in patternnet?

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Mike P 2018-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/429460-how-to-set-performance-weights-for-crossentropy-in-patternnet

回答： Greg Heath 2018-11-13

I am training a patternnet on a two-class imbalanced training set, about 20/80.

The crossentropy function (when called directly) allows for specific performance weights to be assigned, and I want to use that to overweight penalties for the rare class.

However, I don't see how I can set performance weights when using crossentropy in a patternnet. I can assign net.performFcn to be 'crossentropy', and have two properties under net.performParam, 'regularization' and 'normalization'.

So, how can performance weights be specified?