[tune] re-enable tensorboardx without torch installed #17403
Merged
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Why are these changes needed?
TensorboardX 2.4 removed the hard dependency on torch, so we should be fine to use it again.
This PR also works with Tensorboard 2.3 and will throw a warning if torch is not installed, so remains fully backwards compatible.
cc @tgaddair
Related issue number
Related PR #16695
Closes #17366
Checks
scripts/format.sh
to lint the changes in this PR.