Incorrect number of output arguments for ''backward''. Expected to have {0}, but instead it has {1}. You must define a d

[matlab1]

{0}: expected nargout,
{1}: actual nargout,
{2}: number of learnable parameters"


Incorrect number of output arguments for ''backward''. Expected to have {0}, but instead it has {1}. You must define a derivative of the loss with respect to each learnable parameter. This layer has {2} learnable parameters.