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8-Bit LLM Quantization with Lightning Fabric
Latest   Machine Learning

8-Bit LLM Quantization with Lightning Fabric

Last Updated on May 12, 2024 by Editorial Team

Author(s): Tim Cvetko

Originally published on Towards AI.

2024 β€” Easiest Way to any LLM Int-8 Quantization with Lightning Fabric

LLMs are called β€œlarge” for a reason. Models, like GPT-4, have over 220B weights, and over 1.4T total parameters. For us mortals, fine-tuning LLMs that have otherwise performed well on general tasks must take some form of optimization:

Model distillation β€” training a comparatively-smaller LLMPEFT β€” freeze some layers during fine-tuningPruning β€” reducing model size after trainingQuantization β€” using less precise bits to store weight information

->💡 8-Bit Quantization(int8) enables loading larger models you normally wouldn’t be able to fit into memory, and speeding up inference.

8-bit Quantization: Image by AuthorP1: Introduction to Model QuantizationP2: Why 8-Bit QuantizationP3: How YOU can Fine-Tune any LLM with Lightning AI’s Fabric Module

Quantization is a must for most production systems given that edge devices and consumer-grade hardware typically require models of a much smaller memory footprint than more powerful hardware such as NVIDIA’s A100 80GB. Learning about this technique will enable a better understanding of deployment of LLMs like a Llama 2 and SDXL, and requirements for edge devices in robotics, vehicles, and other systems.

The size of a model is determined by the number of its parameters, and their precision, typically one of float32, float16 or bfloat16.

Float Precision: Image by Author

To calculate the model size in bytes,… Read the full blog for free on Medium.

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