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# Big Bird: Transformers for Longer Sequences

NIPS 2020, (2020)

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摘要

Transformers-based models, such as BERT, have been one of the most successful deep learning models for NLP. Unfortunately, one of their core limitations is the quadratic dependency (mainly in terms of memory) on the sequence length due to their full attention mechanism. To remedy this, we propose, BIGBIRD, a sparse attention mechanism tha...更多

代码：

数据：

简介

- Models based on Transformers [92], such as BERT [22, 63], are wildly successful for a wide variety of Natural Language Processing (NLP) tasks and are mainstay of modern NLP research.
- The key innovation in Transformers is the introduction of a self-attention mechanism, which can be evaluated in parallel for each token of the input sequence, eliminating the sequential dependency in recurrent neural networks, like LSTM
- This parallelism enables Transformers to leverage the full power of modern SIMD hardware accelerators like GPUs/TPUs, thereby facilitating training of NLP models on datasets of unprecedented size.
- The pretraining has led to significant improvement in low data regime downstream tasks [51] as well as tasks with sufficient data [102] and have been a major force behind the ubiquity of transformers in contemporary NLP

重点内容

- Models based on Transformers [92], such as BERT [22, 63], are wildly successful for a wide variety of Natural Language Processing (NLP) tasks and are mainstay of modern NLP research
- We systematically develop BIGBIRD, an attention mechanism whose complexity is linear in the number of tokens (Sec. 2)
- We show that when sparse attention mechanisms are used in a standalone encoder, they are Universal Approximators of sequence to sequence functions in the style of Yun et al [105]
- Complementing the above positive results, we show that moving to a sparse-attention mechanism incurs a cost, i.e. there is no free lunch
- We propose BIGBIRD: a sparse attention mechanism that is linear in the number of tokens
- We achieve state of the art results for question answering and document summarization on a number of different datasets
- We further introduce attention based contextual language model for DNA and fine-tune it for down stream tasks such as promoter region prediction and predicting effects of non-coding variants

方法

- Natural Language Processing

the goal is to showcase benefits of modeling longer input sequence for NLP tasks, for which the authors select three representative tasks. - There has been a recent upsurge in using deep learning for genomics data [87, 107, 13], which has resulted in improved performance on several biologically-significant tasks such as promoter site prediction [71], methylation analysis [55], predicting functional effects of non-coding variant [110], etc
- These approaches consume DNA sequence fragments as inputs, and the authors believe longer input sequence handling capability of BIGBIRD would be beneficial as many functional effects in DNA are highly non-local [12].

结果

**Theoretical Results about Sparse Attention Mechanism**

the authors will show that that sparse attention mechanisms are as powerful and expressive as full-attention mechanisms in two respects.- The authors show that when sparse attention mechanisms are used in a standalone encoder, they are Universal Approximators of sequence to sequence functions in the style of Yun et al [105].
- The authors note that this property was explored theoretically in contemporary work Yun et al [106].

结论

- The authors propose BIGBIRD: a sparse attention mechanism that is linear in the number of tokens.
- The authors use the power of extra global tokens preserve the expressive powers of the model.
- The authors complement these results by showing that moving to sparse attention mechanism do incur a cost.
- BIGBIRD gives state-of-the-art performance on a number of NLP tasks such as question answering and long document classification.
- The authors further introduce attention based contextual language model for DNA and fine-tune it for down stream tasks such as promoter region prediction and predicting effects of non-coding variants

总结

## Introduction:

Models based on Transformers [92], such as BERT [22, 63], are wildly successful for a wide variety of Natural Language Processing (NLP) tasks and are mainstay of modern NLP research.- The key innovation in Transformers is the introduction of a self-attention mechanism, which can be evaluated in parallel for each token of the input sequence, eliminating the sequential dependency in recurrent neural networks, like LSTM
- This parallelism enables Transformers to leverage the full power of modern SIMD hardware accelerators like GPUs/TPUs, thereby facilitating training of NLP models on datasets of unprecedented size.
- The pretraining has led to significant improvement in low data regime downstream tasks [51] as well as tasks with sufficient data [102] and have been a major force behind the ubiquity of transformers in contemporary NLP
## Objectives:

The authors' goal is to showcase benefits of modeling longer input sequence for NLP tasks, for which the authors select three representative tasks.## Methods:

Natural Language Processing

the goal is to showcase benefits of modeling longer input sequence for NLP tasks, for which the authors select three representative tasks.- There has been a recent upsurge in using deep learning for genomics data [87, 107, 13], which has resulted in improved performance on several biologically-significant tasks such as promoter site prediction [71], methylation analysis [55], predicting functional effects of non-coding variant [110], etc
- These approaches consume DNA sequence fragments as inputs, and the authors believe longer input sequence handling capability of BIGBIRD would be beneficial as many functional effects in DNA are highly non-local [12].
## Results:

**Theoretical Results about Sparse Attention Mechanism**

the authors will show that that sparse attention mechanisms are as powerful and expressive as full-attention mechanisms in two respects.- The authors show that when sparse attention mechanisms are used in a standalone encoder, they are Universal Approximators of sequence to sequence functions in the style of Yun et al [105].
- The authors note that this property was explored theoretically in contemporary work Yun et al [106].
## Conclusion:

The authors propose BIGBIRD: a sparse attention mechanism that is linear in the number of tokens.- The authors use the power of extra global tokens preserve the expressive powers of the model.
- The authors complement these results by showing that moving to sparse attention mechanism do incur a cost.
- BIGBIRD gives state-of-the-art performance on a number of NLP tasks such as question answering and long document classification.
- The authors further introduce attention based contextual language model for DNA and fine-tune it for down stream tasks such as promoter region prediction and predicting effects of non-coding variants

- Table1: Building block comparison @512 on the nodes. Then a random subset (k%) of all connections is replaced with a random connection. Model
- Table2: QA Dev results using Base size models. We report accuracy for WikiHop and F1 for HotpotQA, Natural Questions, and TriviaQA
- Table3: Fine-tuning results on Test set for QA tasks. The Test results (F1 for HotpotQA, Natural Questions, TriviaQA, and Accuracy for WikiHop) have been picked from their respective leaderboard
- Table4: Summarization ROUGE score for long documents
- Table5: MLM BPC
- Table6: Comparison
- Table7: Chromatin-Profile Prediction

相关工作

- There have been a number of interesting attempts, that were aimed at alleviating the quadratic dependency of Transformers, which can broadly categorized into two directions. First line of work embraces the length limitation and develops method around it. Simplest methods in this category just employ sliding window [94], but in general most work fits in the following general paradigm: using some other mechanism select a smaller subset of relevant contexts to feed in the transformer and optionally iterate, i.e. call transformer block multiple time with different contexts each time. Most prominently, SpanBERT [42], ORQA [54], REALM [34], RAG [57] have achieved strong performance for different tasks. However, it is worth noting that these methods often require significant engineering efforts (like back prop through large scale nearest neighbor search) and are hard to train.

Second line of work questions if full attention is essential and have tried to come up with approaches that do not require full attention, thereby reducing the memory and computation requirements. Prominently, Dai et al [21], Sukhbaatar et al [83], Rae et al [74] have proposed auto-regresive models that work well for left-to-right language modeling but suffer in tasks which require pbidirectional context. Child et al [16] proposed a sparse model that reduces the complexity to O(N N ), Kitaev et al [49] further reduced the complexity to O(N log(N )) by using LSH to compute nearest neighbors. Ye et al [104] proposed binary partitions of the data where as Qiu et al [73] reduced complexity by using block sparsity. Recently, Longformer [8] introduced a localized sliding window based mask with few global mask to reduce computation and extended BERT to longer sequence based tasks. Finally, our work is closely related to and built on the work of Extended Transformers Construction [4]. This work was designed to encode structure in text for transformers. The idea of global tokens was used extensively by them to achieve their goals. Our theoretical work can be seen as providing a justification for the success of these models as well. It is important to note that most of the (a) Random attention (b) Window attention (c) Global Attention (d) BIGBIRD aforementioned methods are heuristic based and empirically are not as versatile and robust as the original transformer, i.e. the same architecture do not attain SoTA on multiple standard benchmarks. (There is one exception of longformer which we include in all our comparisons, Sec. 4). Moreover, these approximations do not come with theoretical guarantees.

基金

- We achieve state of the art results for question answering and document summarization on a number of different datasets
- We showcase that our long input BIGBIRD along with the proposed pretraining significantly improves performances in two downstream tasks
- We see that BIGBIRD achieve nearly perfect accuracy with a 5% jump from the previous best reported accuracy
- With the baselines in Tab. 7 and see that we significantly improve on performance on the harder task

研究对象与分析

standard data-sets: 4

This task involves predicting a random subset of tokens which have been masked out. We use four standard data-sets for pretraining (listed in App. E.1, Tab. 9), warm-starting from the public RoBERTa checkpoint2

challenging datasets: 4

NaturalQ LA SA. Question Answering (QA) We considered following four challenging datasets: 1. Natural Questions [52]: For the given question, find a short span of answer (SA) from the given evidences as well highlight the paragraph from the given evidences containing information about the correct answer (LA)

long document datasets: 3

Summarization Document summarization is a task of creating a short and accurate summary of a text document. We used three long document datasets for testing our model details of which are mention in Tab. 18. In this paper we focus on abstractive summarization of long documents where using a longer contextual encoder should improve performance

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