Created by: ChuRao

def conv_bn(input,
            filter_size,
            num_filters,
            stride,
            padding,
            channels=None,
            num_groups=1,
            act='relu',
            use_cudnn=True):
    parameter_attr = ParamAttr(learning_rate=0.1, initializer=MSRA())
    conv = fluid.layers.conv2d(
        input=input,
        num_filters=num_filters,
        filter_size=filter_size,
        stride=stride,
        padding=padding,
        groups=num_groups,
        act=None,
        use_cudnn=use_cudnn,
        param_attr=parameter_attr,
        bias_attr=False)
    parameter_attr = ParamAttr(learning_rate=0.1, initializer=MSRA())
    bias_attr = ParamAttr(learning_rate=0.2)
    return fluid.layers.batch_norm(input=conv, act=act)

倒数第2、3两行是不是多余了？ mobilenet_ssd.py