Bring Scheme back for backwards compatibility #4789
Merged
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Tracking issue
NA
Why are the changes needed?
We removed Scheme in #4774, but in order to help backwards compatibility, we need to keep it. This PR brings it back.
What changes were proposed in this pull request?
Revert a portion of #4774.
I also fixed a small issue in the parsing of ray config.
How was this patch tested?
Sandbox.
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