I dumped the trees in the random forest model, and occasionally saw a leaf
node with strange stats:
- pred=1.000000 prob=0.800000 imp=-1.000000
gain=-179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000
Here impurity = -1 and gain = a giant negative number. Normally, I would
get a None from Node.stats at a leaf node. Here it printed because Some(s)
matches:
node.stats match {
case Some(s) => println(" imp=%f gain=%f" format(s.impurity,
s.gain))
case None => println
}
Is it a bug?
This doesn't seem happening in the model from DecisionTree, but my data sets
are limited.
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