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DSSM负样本构造问题 #512

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@1985312383

在examples/match_model/dssm_negative_sample.md中,提到:训练样本一般只需准备点击(正样本)的样本即可
这里的意思是,召回的正样本,可以是未曝光点击的样本吗?并不只能是曝光且点击的样本?

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