Github user fmcquillan99 commented on the issue:
https://github.com/apache/madlib/pull/295
LGTM, here is an RF example:
```
SELECT * FROM mt_imp_output ORDER BY am, oob_var_importance DESC;
am | feature | oob_var_importance | impurity_var_importance
----+---------+--------------------+-------------------------
0 | cyl | 31.6266798136018 | 8.99888201496216
0 | disp | 21.3534749649495 | 30.5938284017064
0 | vs | 20.2312669968611 | 25.4855561460076
0 | wt | 16.3410741245189 | 19.7783684870616
0 | qsec | 10.4475041000687 | 15.1433649502623
1 | wt | 34.239597267579 | 24.9348163610914
1 | disp | 29.4316514472623 | 31.1638455198447
1 | cyl | 21.9435741528927 | 20.1221371309527
1 | vs | 14.3851771322661 | 17.5142973837102
1 | qsec | 0 | 6.26490360440106
(10 rows)
```
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