[GitHub] spark issue #17936: [SPARK-20638][Core]Optimize the CartesianRDD to reduce r...

[jtengyp <gi...@git.apache.org>]

Github user jtengyp commented on the issue:

    https://github.com/apache/spark/pull/17936
  
    I think  you@ConeyLiu  should directly test the Cartesian phase with the following patch.
    
    val user = model.userFeatures
    val item = model.productFeatures
    val start = System.nanoTime()
    val rate = user.cartesian(item)
    println(rate.count())
    val time = (System.nanoTime() - start) / 1e9
    
    The recommendForAll in mllib ALS has been merged a new PR#17742. Your PR may not fit this case.


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