ByteTransformer: A High-Performance Transformer Boosted for Variable-Length Inputs

Authors: Yujia Zhai, Chengquan Jiang, Leyuan Wang, Xiaoying Jia, Shang Zhang, Zizhong Chen, Xin Liu, Yibo Zhu

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License: CC BY-NC-SA 4.0

Results of the summarizing process for the arXiv paper: 2210.03052v1

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. The paper introduces ByteTransformer, a high-performance transformer model designed for variable-length inputs in Natural Language Processing (NLP). It addresses the challenges of existing transformer models that require a large parameter space and computational overhead when dealing with variable-length sequences by proposing a zero padding algorithm that eliminates redundant computations on useless padded tokens. Additionally, the paper presents architectural-aware optimizations for the functioning modules of the transformer, particularly the multi-head attention (MHA) algorithm. Experimental results demonstrate that ByteTransformer outperforms existing Transformer frameworks such as PyTorch JIT, TensorFlow XLA, Tencent TurboTransformer, and NVIDIA FasterTransformer by up to 138%. The rest of the paper is organized as follows: Section II provides background information on Transformer models and MHA, as well as related works on DL framework acceleration. Section III details the systematic optimization approach employed in ByteTransformer. Evaluation results are presented in Section IV. Finally, Section V concludes the paper and discusses future work. In summary, ByteTransformer offers significant improvements in performance and efficiency for variable-length inputs in NLP tasks compared to existing Transformer frameworks.
AI-generated keywords: ByteTransformer

AI-generated Key Points

  • ByteTransformer is a high-performance transformer model for variable-length inputs in NLP
  • It addresses challenges of existing transformer models with large parameter space and computational overhead
  • Proposes a zero padding algorithm to eliminate redundant computations on useless padded tokens
  • Presents architectural-aware optimizations for the functioning modules of the transformer, particularly MHA algorithm
  • Experimental results show ByteTransformer outperforms existing Transformer frameworks by up to 138%
  • Paper is organized into sections: background information, systematic optimization approach, evaluation results, conclusion and future work
  • ByteTransformer offers significant improvements in performance and efficiency for variable-length inputs in NLP tasks compared to existing Transformer frameworks.
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Abstract: Transformer is the cornerstone model of Natural Language Processing (NLP) over the past decade. Despite its great success in Deep Learning (DL) applications, the increasingly growing parameter space required by transformer models boosts the demand on accelerating the performance of transformer models. In addition, NLP problems can commonly be faced with variable-length sequences since their word numbers can vary among sentences. Existing DL frameworks need to pad variable-length sequences to the maximal length, which, however, leads to significant memory and computational overhead. In this paper, we present ByteTransformer, a high-performance transformer boosted for variable-length inputs. We propose a zero padding algorithm that enables the whole transformer to be free from redundant computations on useless padded tokens. Besides the algorithmic level optimization, we provide architectural-aware optimizations for transformer functioning modules, especially the performance-critical algorithm, multi-head attention (MHA). Experimental results on an NVIDIA A100 GPU with variable-length sequence inputs validate that our fused MHA (FMHA) outperforms the standard PyTorch MHA by 6.13X. The end-to-end performance of ByteTransformer for a standard BERT transformer model surpasses the state-of-the-art Transformer frameworks, such as PyTorch JIT, TensorFlow XLA, Tencent TurboTransformer and NVIDIA FasterTransformer, by 87\%, 131\%, 138\% and 46\%, respectively.

Submitted to arXiv on 06 Oct. 2022

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