min.node.size. about ranger HOT 1 CLOSED

The min.node.size is evaluated before the splitting, meaning that smaller nodes can occur.
This is also described in the help on ranger():

Note that for classification and regression nodes with size smaller than min.node.size can occur, like in original Random Forest. For survival all nodes contain at least min.node.size samples.

Note the difference for survival forests. The 0 in the R code is mapped to response-specific default values later in C++.

To get the number of nodes per tree you could use
sapply(rf$forest$split.varIDs, length)
where rf is a ranger object with write.forest = TRUE.

from ranger.