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https://issues.apache.org/jira/browse/HIVEMALL-258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16868433#comment-16868433
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ASF GitHub Bot commented on HIVEMALL-258:
-----------------------------------------
myui commented on pull request #194: [HIVEMALL-258] Add UDF to convert
feature/label in Libsvm format
URL: https://github.com/apache/incubator-hivemall/pull/194
## What changes were proposed in this pull request?
Add UDF to convert feature/label in Libsvm format
## What type of PR is it?
Feature
## What is the Jira issue?
https://issues.apache.org/jira/browse/HIVEMALL-258
## How was this patch tested?
unit tests and manual tests
## How to use this feature?
```
Usage:
select to_libsvm_format(array('apple:3.4','orange:2.1'))
> 6284535:3.4 8104713:2.1
select to_libsvm_format(array('apple:3.4','orange:2.1'), '-features 10')
> 3:2.1 7:3.4
select to_libsvm_format(array('7:3.4','3:2.1'), 5.0)
> 5.0 3:2.1 7:3.4
```
## Checklist
(Please remove this section if not needed; check `x` for YES, blank for NO)
- [x] Did you apply source code formatter, i.e., `./bin/format_code.sh`, for
your commit?
- [x] Did you run system tests on Hive (or Spark)?
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> Add UDF to convert feature/label in Libsvm format
> -------------------------------------------------
>
> Key: HIVEMALL-258
> URL: https://issues.apache.org/jira/browse/HIVEMALL-258
> Project: Hivemall
> Issue Type: Improvement
> Reporter: Makoto Yui
> Assignee: Makoto Yui
> Priority: Minor
> Fix For: 0.6.0
>
>
> Add to_libsvm_format UDF something as follows:
> {code:sql}
> select
> to_libsvm_format(features, label) as libsvm
> from
> input
> {code}
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