[GitHub] [spark] zhengruifeng commented on pull request #30468: [SPARK-33518][ML][WIP] Improve performance of ML ALS recommendForAll by GEMV

Mon, 23 Nov 2020 03:14:32 -0800 


zhengruifeng commented on pull request #30468:
URL: https://github.com/apache/spark/pull/30468#issuecomment-732095224


   Then I try to directly aggregate on arrays (containing topK elements) 
obtained in each gemv. But it does not bring visible improvement.
   
   
   
![als_gemv_array_pq_jobs_2020_11_23_18_46_30](https://user-images.githubusercontent.com/7322292/99955900-0f624000-2dc0-11eb-8e61-9c6135e59b11.png)
   
   
![als_gemv_array_pq_exe_2020_11_23_18_48_18](https://user-images.githubusercontent.com/7322292/99955910-1426f400-2dc0-11eb-9d7d-0c886da9030b.png)
   


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