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From "zhengruifeng (Jira)" <>
Subject [jira] [Created] (SPARK-30109) PCA use BLAS.gemv with sparse vector
Date Tue, 03 Dec 2019 10:45:00 GMT
zhengruifeng created SPARK-30109:

             Summary: PCA use BLAS.gemv with sparse vector
                 Key: SPARK-30109
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 3.0.0
            Reporter: zhengruifeng

When PCA was first impled in [SPARK-5521|],
at that time Matrix.multiply(BLAS.gemv internally) did not support sparse vector. So it worked
around it by applying a complex matrix multiplication.

Since [SPARK-7681|], BLAS.gemv supported sparse
vector. So we can directly use Matrix.multiply now.

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