parameters: (self, values)
docstring: Gives the (sub/super)gradient of the atom w.r.t. each argument.
  
          Matrix expressions are vectorized, so the gradient is a matrix.
  
          Args:
              values: A list of numeric values for the arguments.
  
          Returns:
              A list of SciPy CSC sparse matrices or None.
docstring_summary: Gives the (sub/super)gradient of the atom w.r.t. each argument.
docstring_tokens: Gives the ( sub / super ) gradient of the atom w . r . t . each argument .
function: def _grad(self, values):
          """Gives the (sub/super)gradient of the atom w.r.t. each argument.
  
          Matrix expressions are vectorized, so the gradient is a matrix.
  
          Args:
              values: A list of numeric values for the arguments.
  
          Returns:
              A list of SciPy CSC sparse matrices or None.
          """
          raise NotImplementedError()
function_tokens: def _grad ( self , values ) : raise NotImplementedError ( )