Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/9008#issuecomment-209136374
@sethah So to avoid adding any overhead from computing stats for both these
params one option would be to selectively compute only the stats that are
required (e.g. if they request `minInstancesPerNode` per node request that and
if they requeust `min_weight_fraction_leaf` compute the stats needed).
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