I have  this forward function and I use binary masks mask1 and mask2 but  the module 1 get zero gradient  how can I mask out1 so it still gets to be updated?
 # x, z 2D matrices, mask1,mask2 are column vectors with matching height
 def forward(self, x, z, mask2, mask1):
        out1  = self.module1(x)
        in_2 = z * mask1 + out1 *mask2
        return  self.module2 (in_2)


Please help Me