parameters: (self, top, propagate_down, bottom)
docstring: These layers does not back propagate
docstring_summary: These layers does not back propagate
docstring_tokens: These layers does not back propagate
function: def backward(self, top, propagate_down, bottom):
          """
          These layers does not back propagate
          """
          pass
function_tokens: def backward ( self , top , propagate_down , bottom ) : pass