[Core] fix: shard loading and saving when variant is provided. #8869
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SunMarc
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Disty0
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…ngface#8869) fix: shard loading and saving when variant is provided.
sayakpaul
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fix: shard loading and saving when variant is provided.
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This is relevant for models when sharded checkpoints become an absolute necessity for loading in machines with limited RAM. With this change, we can serialize the shards in FP16 properly.
Note that this was supported before but the filename of the shard index file was incorrectly formatted. This PR fixes that and also adds a test for it.