def METHOD_NAME(self, x, x_len):
    """
    Args:
        x (torch.Tensor): (batch_size, timestemps, input_size)
        x_len (torch.LongTensor): (batch_size, )
    Return:
        output (torch.Tensor): (batch_size, output_size)
    """
    assert x.size(-1) == self.input_size
    output = torch.randn(x.size(0), self.output_size)
    assert output