报错：
AttributeError: module 'dgl.function' has no attribute 'copy_src'
错误解析：
copy_src（来源，输出）
使用源节点功能计算消息的内置消息函数。
这个函数在包里面没有，本应该是有这个功能函数的
解决方法：
自己构造一个对应的函数，设立在__init___.py中去
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