Advanced LoRA and PEFT Techniques for LLM Fine-Tuning
Chapter 1: Revisiting Fine-Tuning and the Need for Efficiency
Computational Costs of Full Fine-Tuning
The Parameter Efficiency Imperative
Mathematical Preliminaries: Singular Value Decomposition
Taxonomy of Parameter-Efficient Fine-Tuning Methods
Chapter 2: Low-Rank Adaptation (LoRA) In Depth
The LoRA Hypothesis: Low Intrinsic Rank of Adaptation
Mathematical Formulation of LoRA
Decomposing Weight Update Matrices
Rank Selection Strategies
Scaling Parameter Alpha
Implementing LoRA Layers
Integrating LoRA into Transformer Architectures
Hands-on Practical: Applying Basic LoRA
Chapter 3: Survey of PEFT Methodologies
Adapter Tuning: Architecture and Mechanisms
Adapter Tuning Implementation Details
Prefix Tuning: Conditioning via Continuous Prefixes
Prompt Tuning and P-Tuning Variations
Comparative Analysis: Parameters vs Performance Trade-offs
Memory and Computational Footprints
Hands-on Practical: Implementing Adapter Tuning
Chapter 4: Advanced LoRA Implementations and Variants
LoRA Initialization Strategies
Merging LoRA Weights Post-Training
Quantized LoRA (QLoRA): Principles
QLoRA Implementation Details
Paged Optimizers for Memory Efficiency
Combining LoRA with Other PEFT Approaches
Hands-on Practical: Implementing QLoRA
Chapter 5: Optimization, Deployment, and Practical Considerations
Infrastructure Requirements for PEFT Training
Optimizers and Learning Rate Schedulers for PEFT
Techniques for Multi-Adapter / Multi-Task Training
Debugging PEFT Implementations
Performance Profiling PEFT Training and Inference
Distributed Training Strategies with PEFT
Serving Models with PEFT Adapters
Hands-on Practical: Fine-tuning with Multiple LoRA Adapters
Chapter 6: Evaluating PEFT Performance and Limitations
Standard Metrics for PEFT Evaluation
Benchmarking PEFT against Full Fine-Tuning
Analyzing Robustness and Generalization
Investigating Catastrophic Forgetting
Computational Cost Analysis Revisited
Current Limitations and Open Research Questions
Comparative Analysis: Parameters vs Performance Trade-offs
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- Prefix-Tuning: Optimizing Continuous Prompts for Generation, Xiang Lisa Li, Percy Liang, 2021 Annual Meeting of the Association for Computational Linguistics (ACL) DOI: 10.48550/arXiv.2101.00190 - This paper introduces Prefix-Tuning, a method for fine-tuning by optimizing a continuous prefix prepended to the input, showing its effectiveness for text generation tasks.
- Power of Scale for Parameter-Efficient Prompt Tuning, Brian Lester, Rami Al-Rfou, Noah Constant, 2021 Conference on Empirical Methods in Natural Language Processing (EMNLP) DOI: 10.48550/arXiv.2104.08691 - This work presents Prompt Tuning, an extremely parameter-efficient method that learns soft prompt embeddings for task adaptation, achieving strong performance with larger models.
- QLoRA: Efficient Finetuning of Quantized LLMs, Tim Dettmers, Artidoro Pagnoni, Ari Holtzman, Luke Zettlemoyer, 2023 Conference on Neural Information Processing Systems (NeurIPS) DOI: 10.48550/arXiv.2305.14314 - This paper describes QLoRA, an optimization for LoRA that quantizes the base model to 4-bit, enabling fine-tuning of very large models on consumer GPUs, which is highly relevant to memory efficiency.