mgaido91 commented on a change in pull request #23773: [SPARK-26721][ML] Avoid
per-tree normalization in featureImportance for GBT
URL: https://github.com/apache/spark/pull/23773#discussion_r257304015
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File path:
mllib/src/test/scala/org/apache/spark/ml/classification/GBTClassifierSuite.scala
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@@ -363,7 +363,8 @@ class GBTClassifierSuite extends MLTest with
DefaultReadWriteTest {
val gbtWithFeatureSubset = gbt.setFeatureSubsetStrategy("1")
val importanceFeatures = gbtWithFeatureSubset.fit(df).featureImportances
val mostIF = importanceFeatures.argmax
- assert(mostImportantFeature !== mostIF)
+ assert(mostIF === 1)
Review comment:
The assertion is there to check that a different subset strategy actually
produces different results. In particular, in the first case, the importances
vector is [1.0, 0.0, ...] while in the second case more features are used
(because the trees can check a random variable at time), so the vector is
something like [0.7, ...]. Hence this assertion makes sense in order to check
that the featureSubset strategy is properly taken in account.
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