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https://issues.apache.org/jira/browse/SPARK-7445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402786#comment-15402786
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Ruben Janssen edited comment on SPARK-7445 at 8/1/16 8:57 PM:
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I'd be interested to work on this.
Before I start however, just to clarify:
'Another option is to allow users to provide a list or labels and we use the
ordering.' I think you mean 'Another option is to allow users to provide a list
OF labels and use THAT GIVEN ordering.'?
If that is the case, I would advocate the latter because having binary labels
does not necessarily imply that we have negatives and positives. We could have
"left"/"right" for example. This would also be more flexible for the users and
does not have to be limited to just binary labels.
was (Author: rubenjanssen):
I'd be interested to work on this.
Before I start however, just to clarify:
'Another option is to allow users to provide a list or labels and we use the
ordering.' I think you mean 'Another option is to allow users to provide a list
OF labels and use THAT GIVEN ordering.'?
If that is the case, I would advocate that because having binary labels does
not necessarily imply that we have negatives and positives. We could have
"left"/"right" for example. This would also be more flexible for the users and
does not have to be limited to just binary labels.
> StringIndexer should handle binary labels properly
> --------------------------------------------------
>
> Key: SPARK-7445
> URL: https://issues.apache.org/jira/browse/SPARK-7445
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.4.0
> Reporter: Xiangrui Meng
> Priority: Minor
>
> StringIndexer orders labels by their counts. However, for binary labels, we
> should really map negatives to 0 and positive to 1. So can put special rules
> for binary labels:
> 1. "+1"/"-1", "1"/"-1", "1"/"0"
> 2. "yes"/"no"
> 3. "true"/"false"
> Another option is to allow users to provide a list or labels and we use the
> ordering.
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