def insert_bn(names: list):
    """
    Inserts bn layer after each conv.
    Parameters
    ---
    names : list
        The list of layer names.
    """
    names_bn = []
    for name in names:
        names_bn.append(name)
        if 'conv' in name:
            pos = name.replace('conv', '')
            names_bn.append('bn' + pos)
    return names_bn