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19683569 - fix: support for loading playground v2.5 single file checkpoint. (#7230)

fix: support for loading playground v2.5 single file checkpoint. (#7230) * fix: support for loading playground v2.5 single file checkpoint. * remove is_playground_model. * fix: edm key * apply Dhruv's comments but errors. * fix: things. * delegate model_type inference to a function. * address Dhruv's comment. * address rest of the comments. * fix: kwargs * fix * update --------- Co-authored-by: DN6 <dhruv.nair@gmail.com>