populate quantization_config for kv-cache-scheme only configs #33874
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What does this PR do?
Follow up to https://github.com/huggingface/transformers/pull/31704/files.
Previously if quantization was done for the kv-cache pathway only from compressed-tensors, then quantization_config would not populate.
With this pr, it will now populate
Fixes # (issue)
Same as above
Who can review?
@SunMarc @younesbelkada @dsikka @mgoin