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LLM quantization

LLM quantization refers to the process of compressing large language models by reducing the bit representation of their parameters and activations.

byKerem Gülen
April 13, 2025
in Glossary
Home Resources Glossary

LLM quantization is becoming increasingly vital in the landscape of machine learning, particularly as large language models (LLMs) continue to grow in size and complexity. As the demand for more efficient AI applications rises, understanding how quantization can optimize these models is essential. By reducing the precision of model weights and activations, LLM quantization not only minimizes the model size but also boosts inference speed, making it feasible to deploy sophisticated models even in constrained environments like edge devices.

What is LLM quantization?

LLM quantization refers to the process of compressing large language models by reducing the bit representation of their parameters and activations. By converting floating-point numbers, which typically require 32 bits, into lower precision formats such as 8 bits, it’s possible to significantly decrease the model size. This technique maintains the model’s overall performance while allowing for faster computations and reduced memory consumption.

Importance of LLM quantization

The significance of LLM quantization cannot be overstated in today’s tech landscape. As large language models grow in size, deploying them in resource-constrained environments like smartphones or IoT devices becomes challenging. Quantization allows for:

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  • Resource optimization: Smaller models fit within the limited computational and memory resources of edge devices.
  • Improved accessibility: By reducing the hardware requirements, advanced AI applications become more accessible to a broader audience.

This means developers can create efficient applications without sacrificing quality, enhancing user experiences across various platforms.

How LLM quantization works

Understanding how quantization operates provides insight into its broader implications in machine learning. The primary goal is to lower model size and improve inference efficiency.

Definition of quantization in machine learning

In the context of machine learning, quantization involves mapping high precision representations, like floating-point numbers, to lower precision formats. This process aims to:

  • Reduce model size and memory footprint.
  • Enhance inference speed, benefiting real-time applications.

Overview of quantization effects on model performance

While quantization offers several advantages, it introduces trade-offs. One notable concern is the potential drop in model accuracy as precision decreases. Therefore, careful consideration is needed to balance efficiency against the need for maintaining performance quality.

Types of quantization methods

Different strategies exist for quantizing large language models, each with its unique approach and benefits. These methods can be broadly categorized into post-training quantization and quantization-aware training.

Post-training quantization (PTQ)

PTQ refers to adjusting the model weights after training is complete. This quick approach is applicable in various scenarios and includes:

  • Weight-only quantization: Techniques such as LUT-GEMM and int8() focus exclusively on quantizing weights.
  • Weight and activation quantization: Methods like ZeroQuant and SmoothQuant consider both weights and activations for improved accuracy.

Quantization-aware training (QAT)

QAT integrates the quantization process during model training. By simulating quantization effects, models can learn to adapt to precision constraints from the outset. An innovative approach termed LLM-QAT capitalizes on generative outputs, enhancing the training data’s efficiency and improving post-quantization performance.

Parameter efficient fine tuning (PEFT)

PEFT techniques are designed to refine model performance further while minimizing resource usage. This is crucial for optimizing LLMs post-quantization.

Techniques in PEFT

Several advanced methods fall under the PEFT umbrella:

  • PEQA: This dual-step quantization and fine-tuning approach aims to maintain performance while optimizing both size and speed.
  • QLORA: By introducing paged optimizers and double quantization, QLORA enhances memory efficiency, particularly with long input/output sequences.

Applications of LLM quantization

The practical applications of LLM quantization extend to numerous fields. For instance, deploying LLMs on edge devices like smartphones and IoT gadgets leads to:

  • Enhanced functionalities in everyday technology.
  • A wider reach for advanced AI abilities, contributing to the democratization of AI.

By making powerful AI capabilities accessible, quantization plays a pivotal role in influencing modern technology trends.

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