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line 106 true is : -K.mean((1-alpha)*K.pow(pt_0,gamma)*K.log(1. -pt_0),axis=-1) wrong is : -K.mean(1-alpha)*K.pow(pt_0,gamma)*K.log(1. -pt_0),axis=-1) code lost a '(' you need to add it. but I still have some problem at line 102...