zhengruifeng commented on pull request #30889:
URL: https://github.com/apache/spark/pull/30889#issuecomment-749501070
those models are created by following lines, in 2.4.7:
```
import org.apache.spark.ml.classification._
import org.apache.spark.ml.regression._
val data =
spark.read.format("libsvm").load("/d0/Dev/Opensource/spark/data/mllib/sample_libsvm_data.txt")
val dtc = new DecisionTreeClassifier()
val dtcm = dtc.fit(data)
dtcm.save("/tmp/dtc-2.4.7")
val rfc = new RandomForestClassifier().setNumTrees(2)
val rfcm = rfc.fit(data)
rfcm.save("/tmp/rfc-2.4.7")
val gbtc = new GBTClassifier().setMaxIter(2)
val gbtcm = gbtc.fit(data)
gbtcm.save("/tmp/gbtc-2.4.7")
val dtr = new DecisionTreeRegressor()
val dtrm = dtr.fit(data)
dtrm.save("/tmp/dtr-2.4.7")
val rfr = new RandomForestRegressor().setNumTrees(2)
val rfrm = rfr.fit(data)
rfrm.save("/tmp/rfr-2.4.7")
val gbtr = new GBTRegressor().setMaxIter(2)
val gbtrm = gbtr.fit(data)
gbtrm.save("/tmp/gbtr-2.4.7")
```
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