Why it matters
FT optim shapes fine-tuning feasibility. Understanding shapes design.
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The architecture
PEFT for parameter efficiency.
FSDP for memory sharding.
Activation checkpointing.
FP8 optim states.
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How it works end to end
PEFT library + bitsandbytes + FSDP.
Combine techniques.
Torch Lightning + Axolotl + Unsloth for ergonomics.