def find_parent_layer_and_sub_name(model, name):
    """
    Given the model and the name of a layer, find the parent layer and
    the sub_name of the layer.
    For example, if name is 'block_1/convbn_1/conv_1', the parent layer is
    'block_1/convbn_1' and the sub_name is `conv_1`.
    Args:
        model(paddle.nn.Layer): the model to be quantized.
        name(string): the name of a layer

    Returns:
        parent_layer, subname
    """
    assert isinstance(model, nn.Layer), \
            "The model must be the instance of paddle.nn.Layer."
    assert len(name) > 0, "The input (name) should not be empty."

    last_idx = 0
    idx = 0
    parent_layer = model
    while idx < len(name):
        if name[idx] == '.':
            sub_name = name[last_idx:idx]
            if hasattr(parent_layer, sub_name):
                parent_layer = getattr(parent_layer, sub_name)
                last_idx = idx + 1
        idx += 1
    sub_name = name[last_idx:idx]
    return parent_layer, sub_name

    Given the model and the name of a layer, find the parent layer and
    the sub_name of the layer.
    For example, if name is 'block_1/convbn_1/conv_1', the parent layer is
    'block_1/convbn_1' and the sub_name is `conv_1`.
    Args:
        model(paddle.nn.Layer): the model to be quantized.
        name(string): the name of a layer

    Returns:
        parent_layer, subname
    
ppdet/utils/fuse_utils.py