adjust lax.convert_element_type bind to avoid H2D transfers during tracing #6014
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Co-authored-by: Qiao Zhang <[email protected]>
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@jekbradbury and others noticed that we were performing H2D transfers while tracing, e.g. while tracing
random.split. @zhangqiaorjc and I tracked it down to howlax.convert_element_typewould sometimes call a device_put function directly. The fix was tobindtheconvert_element_typeprimitive in more cases. (See also the discussion thread on #5998 about the fix, which was moved from that PR to this one.)A downside of this fix is that it led to more
convert_element_typeprimitive applications in jaxprs, especially for literals. That added visual clutter. This PR fixes that issue by tweaking_inline_literalsin partial_eval.py to constant-fold dtype conversion of literals at jaxpr formation time. (To do this, I movedconvert_element_type_pto core.py so that partial_eval.py knows about it.)(This PR currently contains two commits from #5998, but once that's merged into master they'll disappear; only the diff from the last commit is relevant to this PR.)fixes #5308