Github user Yunni commented on the issue: https://github.com/apache/spark/pull/16965 @merlintang Not exactly. Each row will explode to L rows, where L is the number of hash tables. Like the following: ``` +--------------------+-----+--------------------+ | datasetA|entry| hashValue| +--------------------+-----+--------------------+ |[[-10.0,-10.0],Wr...| 0|[-2.0,-2.0,3.0,-2.0]| |[[-10.0,-10.0],Wr...| 1|[0.0,-3.0,-1.0,-2.0]| |[[-10.0,-9.0],Wra...| 0|[-2.0,-2.0,3.0,-2.0]| |[[-10.0,-9.0],Wra...| 1|[0.0,-3.0,-1.0,-2.0]| |[[-10.0,-8.0],Wra...| 0|[-2.0,-2.0,3.0,-1.0]| |[[-10.0,-8.0],Wra...| 1| [0.0,-3.0,0.0,-2.0]| ``` You can look at the code here: https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/feature/LSH.scala#L238
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