zhengruifeng commented on a change in pull request #28349:
URL: https://github.com/apache/spark/pull/28349#discussion_r417808922



##########
File path: 
mllib/src/main/scala/org/apache/spark/ml/classification/LinearSVC.scala
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@@ -154,31 +156,56 @@ class LinearSVC @Since("2.2.0") (
   def setAggregationDepth(value: Int): this.type = set(aggregationDepth, value)
   setDefault(aggregationDepth -> 2)
 
+  /**
+   * Set block size for stacking input data in matrices.

Review comment:
       The choice of size needs tuning, it depends on dataset sparsity and 
numFeatures, Increasing it may not always increases performance.




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