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https://issues.apache.org/jira/browse/MAHOUT-954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192125#comment-13192125
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Ikumasa Mukai edited comment on MAHOUT-954 at 1/25/12 7:39 AM:
---------------------------------------------------------------
The output of RegressionResultAnalyzer is changed like this.
{noformat}
=======================================================
Summary
-------------------------------------------------------
Correlation coefficient : 0.4257
Mean absolute error : 0.9395
Root mean squared error : 1.2048
Predictable Instances : 717
Unpredictable Instances : 0
Total Regressed Instances : 717
{noformat}
2 items, "Predictable Instances" and "Unpredictable Instances" are added.
For getting them, my patch contains the modification for classify() on
DecisionForest.java.
With the trunk version of this method, we can get just a last tree, not all
trees.
was (Author: ikumasa mukai):
The output of RegressionResultAnalyzer is changed like this.
{noformat}
=======================================================
Summary
-------------------------------------------------------
Correlation coefficient : 0.4257
Mean absolute error : 0.9395
Root mean squared error : 1.2048
Predictable Instances : 717
Unpredictable Instances : 0
Total Regressed Instances : 717
{noformat}
2 items, "Predictable Instances" and "Unpredictable Instances" are added.
> "Unpredictable" have to be represented by NaN on DF.
> ----------------------------------------------------
>
> Key: MAHOUT-954
> URL: https://issues.apache.org/jira/browse/MAHOUT-954
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Reporter: Ikumasa Mukai
> Labels: DecisionForest, Regression
> Attachments: MAHOUT-954.patch
>
>
> On our RandomForest src, we uses "-1" for representing "Unpredictable",
> but for regression problem, there is a case which outputs "-1" for the
> correct result.
> For resolving this problem, we should change the unpredictable flag to "NaN"
> from "-1".
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