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您好,我在mind实现代码中看到调用 input_from_feature_columns 函数得到用户的历史行为的表示,而在该函数中使用了get_varlen_pooling_list对用户的行为进行了pooling操作,想要请问这样做的原因是什么呢?好像原版本的deepmatch中也使用了这个操作,根据原论文胶囊层输入应该是各个items的embeddings(如下图)。
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