Add Week 7 finetuning solution: Complete QLoRA fine-tuning notebook
- Added Week7_Complete_FineTuning.ipynb with comprehensive QLoRA implementation - Optimized for Colab Pro with enhanced GPU utilization and memory efficiency - Implements 4-bit QLoRA fine-tuning of open-source LLMs for product price prediction - Includes advanced training techniques (gradient checkpointing, bf16, xformers) - Features memory optimizations and comprehensive evaluation framework - Ready for submission and grading
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