Github user fmcquillan99 commented on the issue:
https://github.com/apache/madlib/pull/295
Should impurity_var_importance always add up to 100?
From the regression example in the user docs:
```
DROP TABLE IF EXISTS mt_imp_output;
SELECT madlib.get_var_importance('mt_cars_output','mt_imp_output');
SELECT am, impurity_var_importance FROM mt_imp_output ORDER BY am,
impurity_var_importance DESC;
```
results in
```
am | impurity_var_importance
----+-------------------------
0 | 35.7664683110879
0 | 24.7481977075922
0 | 12.4401197123678
0 | 12.1559096708347
0 | 4.88929809351791
1 | 31.7259035495099
1 | 29.6146492693988
1 | 14.9602257795489
1 | 7.01369118455985
1 | 6.68552870777581
(10 rows)
```
which does not add up to 100
```
grp 0 grp 1
35.76646831 31.72590355
24.74819771 29.61464927
12.44011971 14.96022578
12.15590967 7.013691185
4.889298094 6.685528708
total 89.9999935 89.99999849
```
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