def METHOD_NAME(h, D=None, avg_d=None):
    """
    Identity scaling function.
    Parameters
    ----------
    h : torch.Tensor
        Input tensor.
    D : torch.Tensor, optional
        Degree tensor.
    avg_d : dict, optional
        Dictionary containing averages over the training set.
    Returns
    -------
    torch.Tensor
        Scaled input tensor.
    """
    return h