Renamed sklearn to sklearn_fork, so that it is compatible with installing scikit-learn main under the sklearn namespace. Now, one can install both scikit-learn-tree and scikit-learn in their packages.
It is recommended that one use sklearn_fork for all things related to decision tree models such as:
RandomForest*ExtraTrees*- and any importable item from the
tree/submodule
and then use sklearn for anything else.