Save all parameters into a file with the specified format.

        Currently hdf5 and protobuf formats are supported.

        Args:
            path : path or file object
            grad_only (bool, optional): Return parameters with `need_grad` option as `True`.

def save_parameters(self, path, grad_only=False):
        """Save all parameters into a file with the specified format.

        Currently hdf5 and protobuf formats are supported.

        Args:
            path : path or file object
            grad_only (bool, optional): Return parameters with `need_grad` option as `True`. 
        """
        params = self.get_parameters(grad_only=grad_only)
        nn.save_parameters(path, params)