zhengruifeng commented on pull request #28473:
URL: https://github.com/apache/spark/pull/28473#issuecomment-625612777
testCode:
```
import org.apache.spark.ml.regression._
import org.apache.spark.storage.StorageLevel
val df = spark.read.option("numFeatures",
"2000").format("libsvm").load("/data1/Datasets/epsilon/epsilon_normalized.t").withColumn("censor",
(col("label")+1)/2).withColumn("label", (col("label")+2)/2)
df.persist(StorageLevel.MEMORY_AND_DISK)
df.count
val aft = new AFTSurvivalRegression().setMaxIter(50)
aft.fit(df)
val results = Seq(1, 4, 16, 64, 256, 1024, 4096).map { size => val start =
System.currentTimeMillis; val model = aft.setBlockSize(size).fit(df); val end =
System.currentTimeMillis; (size, model, end - start) }
```
results:
```
scala> results.foreach(t => println(t._2.coefficients.toString.take(100)))
[-0.0739321337153592,-0.020829491487167364,0.06661851987557675,0.019253370633371538,-0.0588055025651
[-0.07393213372315585,-0.020829491465817675,0.06661851987897843,0.019253370565929854,-0.058805502527
[-0.07393213383693777,-0.020829491161483995,0.06661851992574323,0.019253369608308712,-0.058805501990
[-0.07393213385166159,-0.020829491120415617,0.06661851993259112,0.019253369477997134,-0.058805501918
[-0.07393213382685696,-0.020829491187320876,0.06661851992205566,0.019253369688987693,-0.058805502036
[-0.07393213385098614,-0.02082949112233834,0.06661851993235628,0.019253369483972174,-0.0588055019215
[-0.07393213377460728,-0.020829491324180386,0.06661851990185824,0.0192533701179324,-0.05880550227761
scala> results.map(_._2.intercept)
res18: Seq[Double] = List(0.4605592348900757, 0.4605592349298284,
0.46055923549542066, 0.4605592355720131, 0.4605592354475875,
0.46055923556842815, 0.46055923519370545)
scala> results.map(_._2.scale)
res19: Seq[Double] = List(0.07575246987902046, 0.07575246988748957,
0.07575247000765407, 0.07575247002401692, 0.07575246999753335,
0.07575247002326578, 0.07575246994370846)
scala> results.map(_._3)
res20: Seq[Long] = List(137684, 12706, 12453, 16875, 13661, 13791, 14540)
```
When blockSize is set 256, it is 10X faster than existing impl.
**blockSize=1**
**blockSize=256**
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