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CRISP: Hybrid Structured Sparsity for Class-aware Model Pruning


Concetti Chiave
CRISP introduces a novel pruning framework combining fine-grained N:M and coarse-grained block sparsity to achieve high accuracy with superior hardware efficiency.
Sintesi

I. Abstract

  • Machine learning pipelines aim to enhance computational efficiency by tailoring models to focus on user-specific classes.
  • Existing works rely on unstructured or structured pruning, but they may lead to reduced model accuracy.
  • CRISP proposes a hybrid structured sparsity pattern for efficient model pruning.

II. Introduction

  • Personalizing models for individual users can reduce resource requirements and enhance efficiency.
  • Unstructured pruning is inefficient unless the model is highly sparse.
  • Existing class-aware pruning methods struggle with maintaining high accuracy at high sparsity levels.

III. CRISP Pruning Framework

A. Hybrid Structured Sparsity Pattern
  • Combines fine-grained N:M and coarse-grained block sparsity.
  • Ensures uniform load balancing and efficient hardware implementation.
B. Method Overview
  • Three-step iterative pruning process: class-aware fine-tuning, N:M pruning, and block pruning.
  • Prevents layer collapse by gradually increasing global model sparsity over multiple iterations.
C. Pruning Algorithm
  • Fine-tunes the model iteratively based on class-aware saliency scores.
  • Utilizes straight-through estimator for N:M fine-grained pruning and uniform block pruning.
D. Pruning Metric
  • Measures weight importance based on gradient flow using user-preferred classes.
  • Criteria include large weight magnitude with small gradients, small weight magnitude with large gradients, and both small weight magnitude and small gradients.
E. Accelerator-level Design
  • Introduces CRISP-STC hardware accelerator design inspired by NVIDIA's Sparse Tensor Core (STC).
  • Achieves up to 30× energy efficiency compared to the dense model.

IV. Experimental Evaluation

A. Experimental Methodology
  • Evaluates memory-intensive networks on ImageNet dataset using various configurations of CRISP versus baselines OCAP and CAPNN.
B. Experimental Results
  • CRISP consistently outperforms block pruning in terms of accuracy at higher sparsity levels.

V. Conclusion

CRISP offers an efficient solution for class-aware personalization through structured sparsity patterns, achieving high accuracy with superior hardware efficiency.

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Statistiche
この研究では、CRISPは最大14倍のレイテンシー削減と30倍のエネルギー効率を達成しました。
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Approfondimenti chiave tratti da

by Shivam Aggar... alle arxiv.org 03-19-2024

https://arxiv.org/pdf/2311.14272.pdf
CRISP

Domande più approfondite

データセットに対する精度向上以外に、CRISPが他の機械学習タスクにどのように応用できるか?

CRISPは、提案されたハイブリッド構造スパース性を活用して、他の機械学習タスクでも幅広く応用可能です。例えば、自然言語処理や音声認識などの領域で利用する際にも、個々のユーザーが特定の単語やフレーズに焦点を当てることでモデルを最適化し、計算効率を向上させることができます。また、異種デバイス間でモデルを共有する場合やエッジコンピューティング環境でのリソース制約下でもCRISPは有益です。さらに、連続学習や動的なモデル更新などへの適用も考えられます。

提案されたハイブリッド構造スパース性は、他のプルーニング方法と比較してどのような利点がありますか?

CRISPが持つハイブリッド構造スパース性はいくつか重要な利点を備えています。まず第一に、このアプローチでは従来手法では難しかった高い圧縮率(90%以上)でも高い精度を実現します。これは通常プルーニング手法では困難だった領域です。また、「均等な非ゼロ値ブロック」戦略を採用することで負荷分散問題も解決しました。さらにメタデータストレージ量も削減されるためメモリ使用効率も向上します。
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