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WIP: Integrate SpQR + FSDP functionalities - #840
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This PR adds initial FSDP support for training QLoRA models. It enables basic FSDP and CPU Offload support, with low memory training via FSDP.sync_module_states option unsupported. This PR builds off of #840 commit 8278fca and BNB FSDP by @TimDettmers and @Titus-von-Koeller. An example of using this PR to finetune QLoRA models with FSDP can be found in the demo repo: AnswerDotAi/fsdp_qlora. * Minimal changes for fp32 4bit storage from BNB commit 8278fca * Params4bit with selectable storage dtype * possible fix for double quantizing linear weight & quant storage dtype * minor fixes in Params4bit for peft tests * remove redundant * add float16 * update test * Remove float16 quant cast as there are fp32, bf16, & fp16 quant kernels --------- Co-authored-by: Kerem Turgutlu <keremturgutlu@gmail.com>
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