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https://issues.apache.org/jira/browse/ARROW-6436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932318#comment-16932318
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Antoine Pitrou commented on ARROW-6436:
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See also ARROW-3802. Numpy has dedicated float16 routines that we could reuse.
Given that it's Numpy it's probably well-maintained.
There may be other projects around.
> [C++] vendor a half precision floating point library
> ----------------------------------------------------
>
> Key: ARROW-6436
> URL: https://issues.apache.org/jira/browse/ARROW-6436
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Benjamin Kietzman
> Priority: Major
>
> Clang and GCC provide _Float16 and there are numerous polyfills which can
> emulate a 16 bit float for other platforms. This would fill a hole in the
> kernels and other code which don't currently support HALF_FLOAT.
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