sanitize arrays when logging as hyperparameters in TensorBoardLogger

[awaelchli]

What does this PR do?

Fixes #9022

TensorBoardLogger can log hyperparameters but not all types of data. It can do arrays that are 1-dimensional but anything higher-dimensional not, so we will sanitize it by converting to string as we do with other unsupported types.

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[codecov]

Codecov Report

Merging #9031 (fc61804) into master (c8e9fb4) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9031    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
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  Files         175     175            
  Lines       14457   14462     +5     
=======================================
- Hits        13406   12811   -595     
- Misses       1051    1651   +600     

[tchaton]

Neat !

[ananthsub]

For later, should we move this out as a utility function? Are there opportunities for consolidation with other hyper parameter saving logic the framework has?

[awaelchli]

We can but keep in mind not all loggers have the same level of support and flexibility so sanitization, flattening etc. is generally speaking always subject to the individual logger.

Are there opportunities for consolidation with other hyper parameter saving logic the framework has?

not any I know of