[data] add a comment explaining the bundling behavior for map_batches with default batch_size #47433
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Why are these changes needed?
When batch_size is not set, input blocks are will be not bundled up.
Add a comment explaining this.
See #29971 and #47363 (comment)
Related issue number
Checks
git commit -s
) in this PR.scripts/format.sh
to lint the changes in this PR.method in Tune, I've added it in
doc/source/tune/api/
under thecorresponding
.rst
file.