zhengruifeng commented on issue #26415: [SPARK-18409][ML] LSH approxNearestNeighbors should use approxQuantile instead of sort URL: https://github.com/apache/spark/pull/26415#issuecomment-552077143 Maybe we can add a new param like `method`, it support serveral option: 1, exact, existing method 2, approx, using approxQuantile 3, stackļ¼also an exact method, using `org.apache.spark.util.BoundedPriorityQueue` or `org.apache.spark.ml.recommendation.TopByKeyAggregator`, it only supports a relative small `numNearestNeighbors` (maybe <1000, this threshold is related to RAM config) to avoid OOM. However, it should be much faster than approach 1&2.
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