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val feature_right_cate2 = category2.getOrElse(cate2_right, "{}")
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val feature_right_cate2 = category2.getOrElse(cate2_right, "{}")
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(logKey, label, vid_left, vid_right, feature_left, feature_right, feature_left_action, feature_right_action,
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(logKey, label, vid_left, vid_right, feature_left, feature_right, feature_left_action, feature_right_action,
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- feature_left_cate1, feature_right_cate1, feature_left_cate2, feature_right_cate2)
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+ feature_left_cate1, feature_right_cate1, feature_left_cate2, feature_right_cate2).productIterator.mkString("\t")
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