def METHOD_NAME(data, ch_3x3, name, attr):
    # conv 3x3
    conv = ConvFactory(data=data, name=name+'_conv',kernel=(3, 3), stride=(2, 2), num_filter=ch_3x3, pad=(1, 1), attr=attr)
    # pool
    pool = mx.symbol.Pooling(data=data, name=name+'_pool',kernel=(3, 3), stride=(2, 2), pad=(1, 1), pool_type='max', attr=attr)
    # concat
    concat = mx.symbol.Concat(*[conv, pool], name=name+'_ch_concat')
    return concat