def lprint(input_x, output, name=None):
    """Print option interface.

    This function is to stdout the shape of input layer & output layer
    in Deep Learning architecture.

    Parameters
    ----------
    input_x: numpy.ndarray
      A ``numpy.ndarray`` object of input source.

    output: numpy.ndarray
      A ``numpy.ndarray`` object of output target.

    name: str (default: None)
      An optional name you want to print out.

    """
    print(f'{str(name)}:\t{input_x.shape} -> {output.shape}')
