Update the model arguments with additional arguments.

        Args:
            kwargs (dict): Optional keyword arguments to add to prior args.

def update(self, **kwargs):
        '''Update the model arguments with additional arguments.

        Args:
            kwargs (dict): Optional keyword arguments to add to prior args.
        '''

        # Backends expect numpy arrays, so make sure all numeric values are
        # represented as such.
        kwargs = {k: (np.array(v) if isinstance(v, (int, float)) else v)
                  for k, v in kwargs.items()}
        self.args.update(kwargs)