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Compare LoRA, prefix tuning, prompt tuning, and adapters. How do PEFT methods differ?

PEFT is a family, not just LoRA, and interviewers probe whether you know how each one injects trainable parameters. The signal is where each method adds capacity and the latency and quality tradeoffs that follow.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

PEFT is a family, not just LoRA, and interviewers probe whether you know how each one injects trainable parameters. The signal is where each method adds capacity and the latency and quality tradeoffs that follow.

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