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Blockwise Self-Attention for Long Document Understanding

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arxiv 1911.02972 v2 pith:D7DPK2NN submitted 2019-11-07 cs.CL cs.LG

Blockwise Self-Attention for Long Document Understanding

classification cs.CL cs.LG
keywords modelblockberttimeattentionbertbetterinferenceless
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present BlockBERT, a lightweight and efficient BERT model for better modeling long-distance dependencies. Our model extends BERT by introducing sparse block structures into the attention matrix to reduce both memory consumption and training/inference time, which also enables attention heads to capture either short- or long-range contextual information. We conduct experiments on language model pre-training and several benchmark question answering datasets with various paragraph lengths. BlockBERT uses 18.7-36.1% less memory and 12.0-25.1% less time to learn the model. During testing, BlockBERT saves 27.8% inference time, while having comparable and sometimes better prediction accuracy, compared to an advanced BERT-based model, RoBERTa.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Longformer: The Long-Document Transformer

    cs.CL 2020-04 accept novelty 7.0

    Longformer uses local windowed attention plus task-specific global attention to achieve linear scaling and state-of-the-art results on long-document language modeling, QA, and summarization after pretraining.

  2. MoBA: Mixture of Block Attention for Long-Context LLMs

    cs.LG 2025-02 unverdicted novelty 6.0

    MoBA routes attention over blocks via MoE-style gating to enable dynamic, bias-light long-context attention that matches full attention performance at lower cost.

  3. Deformable DETR: Deformable Transformers for End-to-End Object Detection

    cs.CV 2020-10 accept novelty 6.0

    Deformable DETR achieves higher accuracy than DETR, especially on small objects, while converging in one-tenth the training epochs by using sparse deformable attention on image features.

  4. Linformer: Self-Attention with Linear Complexity

    cs.LG 2020-06 conditional novelty 6.0

    Linformer approximates self-attention with a low-rank projection to achieve O(n) time and space complexity while matching Transformer accuracy on standard NLP tasks.