Load parameters from file.

        filename : str
            Path to parameter file.
        ctx : Context or list of Context, default cpu()
            Context(s) initialize loaded parameters on.

def load_parameters(self, filename, ctx=mx.cpu()): # pylint: disable=arguments-differ
        """Load parameters from file.

        filename : str
            Path to parameter file.
        ctx : Context or list of Context, default cpu()
            Context(s) initialize loaded parameters on.
        """
        self.lm_model.load_parameters(filename, ctx=ctx)