code: def derivative(self,*args):
          '''
          Returns the derivative of the function with respect to the first dimension.
          '''
          if self.i_dim == 0:
              return np.ones_like(*args[0])
          else:
              return np.zeros_like(*args[0]f derivative(self,*args):
          '''
          Returns the derivative of the function with respect to the first dimension.
          '''
          if self.i_dim == 0:
              return np.ones_like(*args[0])
          else:
              return np.zeros_like(*args[0])
docs: Returns the derivative of the function with respect to the first dimension.