Simple Recurrent Units for Highly Parallelizable Recurrence
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Abstract (arXiv)
Common recurrent neural architectures scale poorly due to the intrinsic difficulty in parallelizing their state computations. In this work, we propose the Simple Recurrent Unit (SRU), a light recurrent unit that balances model capacity and scalability. SRU is designed to provide expressive recurrence, enable highly parallelized implementation, and comes with careful initialization to facilitate training of deep models. We demonstrate the effectiveness of SRU on multiple NLP tasks. SRU achieves 5--9x speed-up over cuDNN-optimized LSTM on classification and question answering datasets, and delivers stronger results than LSTM and convolutional models. We also obtain an average of 0.7 BLEU improvement over the Transformer model on translation by incorporating SRU into the architecture.
Key facts. Cited by 60 papers in the map (data through 7 Oct 2026). First posted on arXiv 8 Sep 2017.
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Citing papers per year: 2020: 1; 2021: 16; 2022: 9; 2023: 13; 2024: 7; 2025: 11; 2026: 3.
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- 2024Transformers are SSMs: Generalized Models and Efficient Algorithms Through Structured State Space Dualitycited by 1,283
- 2022Simplified State Space Layers for Sequence Modelingcited by 776
- 2025Sequential-Parallel Duality in Prefix Scannable Modelscited by 8
- 2025Sequential-Parallel Duality in Prefix Scannable Models12 Jun 2025
- 2024Transformers are SSMs: Generalized Models and Efficient Algorithms Through Structured State Space Duality31 May 2024
- 2023Mamba: Linear-Time Sequence Modeling with Selective State Spaces1 Dec 2023
- 2022Simplified State Space Layers for Sequence Modeling9 Aug 2022
- 2023RWKV: Reinventing RNNs for the Transformer Eracited by 814
- 2021Combining Recurrent, Convolutional, and Continuous-time Models with Linear State-Space Layerscited by 607
- 2021Delving into Deep Imbalanced Regressioncited by 157
- 2022Block-Recurrent Transformerscited by 107
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- 2021UnICORNN: A recurrent model for learning very long time dependenciescited by 56
- 2023Efficient Neural Music Generationcited by 50
- 2023Parallelizing non-linear sequential models over the sequence lengthcited by 45
- 2024The Expressive Capacity of State Space Models: A Formal Language Perspectivecited by 45
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- 2025Bidirectional Linear Recurrent Models for Sequence-Level Multisource Fusion11 Apr 2025
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