Update README.md (d2l-ai#2536)

README.md

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-## Cool Papers Using D2L
-
-1. [**Descending through a Crowded Valley--Benchmarking Deep Learning Optimizers**](https://arxiv.org/pdf/2007.01547.pdf). R. Schmidt, F. Schneider, P. Hennig. *International Conference on Machine Learning, 2021*
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-1. [**Universal Average-Case Optimality of Polyak Momentum**](https://arxiv.org/pdf/2002.04664.pdf). D. Scieur, F. Pedregosan. *International Conference on Machine Learning, 2020*
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-1. [**2D Digital Image Correlation and Region-Based Convolutional Neural Network in Monitoring and Evaluation of Surface Cracks in Concrete Structural Elements**](https://www.mdpi.com/1996-1944/13/16/3527/pdf). M. Słoński, M. Tekieli. *Materials, 2020*
-
-1. [**GluonCV and GluonNLP: Deep Learning in Computer Vision and Natural Language Processing**](https://www.jmlr.org/papers/volume21/19-429/19-429.pdf). J. Guo, H. He, T. He, L. Lausen, M. Li, H. Lin, X. Shi, C. Wang, J. Xie, S. Zha, A. Zhang, H. Zhang, Z. Zhang, Z. Zhang, S. Zheng, and Y. Zhu. *Journal of Machine Learning Research, 2020*
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-1. [**Detecting Human Driver Inattentive and Aggressive Driving Behavior Using Deep Learning: Recent Advances, Requirements and Open Challenges**](https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9107077). M. Alkinani, W. Khan, Q. Arshad. *IEEE Access, 2020*
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-<details><summary>more</summary>
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-1. [**Diagnosing Parkinson by Using Deep Autoencoder Neural Network**](https://link.springer.com/chapter/10.1007/978-981-15-6325-6_5). U. Kose, O. Deperlioglu, J. Alzubi, B. Patrut. *Deep Learning for Medical Decision Support Systems, 2020*
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-1. [**Deep Learning Architectures for Medical Diagnosis**](https://link.springer.com/chapter/10.1007/978-981-15-6325-6_2). U. Kose, O. Deperlioglu, J. Alzubi, B. Patrut. *Deep Learning for Medical Decision Support Systems, 2020*
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-1. [**ControlVAE: Tuning, Analytical Properties, and Performance Analysis**](https://arxiv.org/pdf/2011.01754.pdf). H. Shao, Z. Xiao, S. Yao, D. Sun, A. Zhang, S. Liu, T. Abdelzaher.
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-1. [**Potential, challenges and future directions for deep learning in prognostics and health management applications**](https://reader.elsevier.com/reader/sd/pii/S0952197620301184?token=7261E56B97513C5D621B9B5F43CAABEC2860AE3036278C3E5264707C32DCB658077B2AFA6ED6D5CD0FB7B16770828080). O. Fink, Q. Wang, M. Svensén, P. Dersin, W-J. Lee, M. Ducoffe. *Engineering Applications of Artificial Intelligence, 2020*
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-1. [**Learning User Representations with Hypercuboids for Recommender Systems**](https://arxiv.org/pdf/2011.05742.pdf). S. Zhang, H. Liu, A. Zhang, Y. Hu, C. Zhang, Y. Li, T. Zhu, S. He, W. Ou. *ACM International Conference on Web Search and Data Mining, 2021*
-
-</details>
-
 
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