Dr Sham Puthiya Parambath

  • Research Associate (School of Computing Science)

Biography

Office: G132

 

I, Shameem Ahamed Puthiya Parambath, am a member of the Knowledge & Data Engineering Systems (KDES)  under the research group Information, Data and Analysis (IDA) in the School of Computing Science, University of Glasgow, working with Dr Christos Anagnostopoulos and Prof. Roderick Murray-Smith.

I hail from the small, picturesque coastal town of Thalassery in the state of Kerala, India, where I have spent the majority of my life. My home is situated next to the splendid Government Brennen College in Dharmadom, near a river. I cherish the memories of the two remarkable years I spent at Brennen College.

I completed PhD in Machine Learning from the University of Technology Compiegne (Sorbonne University Association) France. Throughout this academic journey, I had the privilege of being mentored by Dr. Nicolas Usunier and Dr. Yves Grandvalet. During my Masters at Umea University, I had the opportunity to collaborate with Dr. Sihem Amer-Yahia.

Prior to joining the University of Glasgow, I served as a Postdoctoral Researcher at the Qatar Computing Research Institute, Doha, Qatar. In my current role, I focus on enhancing sequential algorithms for various applications such as dynamic pricing, federated learning, and edge computing. At QCRI,I specialized in Recommender Systems, Knowledge Graphs, and Anomaly Detection. Notably, my research on group recommendation and cold-start recommendation received recognition through publications in AAAI and ECML conferences. Furthermore, my work on quantifying bias in knowledge graphs was published in UAI. During my doctoral studies, my research revolved around multi-objective learning algorithms for multi-class/multi-label classification and personalized recommendations, with publications in prestigious venues. such as NeurIPS and RecSys.

Research interests

 

  • Learning with feedback
  • Reinforcement Learning
  • Mutli-Armed Bandits
  • Recommender Systems
  • Federated Learning

 

Google Scholar: [link]

Publications

List by: Type | Date

Jump to: 2025 | 2024 | 2022 | 2021 | 2020 | 2018 | 2017 | 2016 | 2014
Number of items: 21.

2025

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, LI, WENHAO, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Korobilis, Dimitris ORCID logoORCID: https://orcid.org/0000-0001-9146-3008 (2025) CluE: Cluster, Sample & Eliminate - Bayesian Block Elimination for Pure Exploration with Non-binary Rewards and Limited Budget. In: IEEE ICDCS 2025 45th IEEE International Conference on Distributed Computing Systems, Glasgow, Scotland UK, 20-23 July 2025, (Accepted for Publication)

Al-Fahad, Saleh Abdullah, Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 (2025) Gradient Bandit Experts for Node Selection in Edge Computing. In: IEEE ICDCS 2025 45th IEEE International Conference on Distributed Computing Systems, Glasgow, Scotland UK, 20-23 July 2025, (Accepted for Publication)

Tan, Zhuoran, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Parambath, Sham P. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Xiao, Ke and Singer, Jeremy ORCID logoORCID: https://orcid.org/0000-0001-9462-6802 (2025) Unified Parallel Semantic Log Parsing based on Causal Graph Construction for Attack Attribution. In: 45th IEEE International Conference on Distributed Computing Systems (ICDCS), Glasgow, UK, 20-23 July 2025, (Accepted for Publication)

Forstenhaeusler, Maximilian, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Külzer, Daniel and Weber, Natascha (2025) Leveraging Federated Learning for Decentralized Semi-Supervised Task-Informed Representation Learning on Sequential Data. In: 45th IEEE International Conference on Distributed Computing Systems (IEEE ICDCS 2025), Glasgow, UK, 20-23 July 2025,

Tan, Zhuoran, Wang, Qiyuan, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Singer, Jeremy ORCID logoORCID: https://orcid.org/0000-0001-9462-6802 and Temple, Sam (2025) Distributed Log-driven Anomaly Detection System Based on Evolving Decision Making. In: 45th IEEE International Conference on Distributed Computing Systems (IEEE ICDCS 2025), Glasgow, UK, 20-23 July 2025, (Accepted for Publication)

Al-Fahad, Saleh, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Kolomvatsos, Kostas (2025) Node selection using adversarial expert-based multi-armed bandits in distributed computing. Computing, 107(3), 85. (doi: 10.1007/s00607-025-01443-w)

2024

Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Alfahad, Saleh Abdullah M. (2024) Thompson sampling-based recursive block elimination for dynamic assignment under limited budget in pure-exploration. Data Mining and Knowledge Discovery, (Accepted for Publication)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962 (2024) Sequential query prediction based on multi-armed bandits with ensemble of transformer experts and immediate feedback. Data Mining and Knowledge Discovery, 38(6), pp. 3758-3782. (doi: 10.1007/s10618-024-01057-4)

Li, Wenhao, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Bryson, Kevin ORCID logoORCID: https://orcid.org/0000-0002-1163-6368 (2024) LIFE: Leader-driven Hierarchical & Inclusive Federated Learning. In: 2024 IEEE International Conference on Big Data (IEEE BigData 2024), Washington D.C., USA, 15-18 Dec 2024, (Accepted for Publication)

Aladwani, Tahani, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Deligianni, Fani ORCID logoORCID: https://orcid.org/0000-0003-1306-5017 (2024) CL-FML: Cluster-based & Label-aware Federated Meta-Learning for On-Demand Classification Tasks. In: 11th IEEE International Conference on Data Science and Advanced Analytics (DSAA 2024), San Diego, CA, United States, 6-10 October 2024, (doi: 10.1109/DSAA61799.2024.10722828)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Al-Fahad, Saleh Abdullah M., Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Kolomvatsos, Kostas (2024) Sequential Block Elimination for Dynamic Pricing. In: The 2nd International Workshop on Data Mining in Finance (DMF 2024) at the IEEE International Conference on Data Mining, Abu Dhabi, United Arab Emirates, 09-12 Dec 2024, (Accepted for Publication)

Aladwani, Tahani, Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Deligianni, Fani ORCID logoORCID: https://orcid.org/0000-0003-1306-5017 (2024) The Price of Labelling: A Two-Phase Federated Self-Learning Approach. In: European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD 2024), Vilnius, Lithuania, 9-13 September 2024, (Accepted for Publication)

Long, Qianyu ORCID logoORCID: https://orcid.org/0000-0002-8298-2380, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Bi, Daning (2024) FedDIP: Federated Learning with Extreme Dynamic Pruning and Incremental Regularization. In: IEEE ICDM 2023, Shanghai, China, 1-4 December 2023, pp. 1187-1192. ISBN 9798350307887 (doi: 10.1109/ICDM58522.2023.00146)

2022

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Liu, Siwei, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962 and Ounis, Iadh ORCID logoORCID: https://orcid.org/0000-0003-4701-3223 (2022) Parameter Tuning of Reranking-based Diversification Algorithms using Total Curvature Analysis. In: 8th ACM SIGIR International Conference on the Theory of Information Retrieval (ICTIR 2022), Madrid, Spain, 11-12 July 2022, ISBN 9781450394123 (doi: 10.1145/3539813.3545135)

2021

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962, MacAvaney, Sean ORCID logoORCID: https://orcid.org/0000-0002-8914-2659 and Zervas, Evangelos (2021) Max-Utility Based Arm Selection Strategy for Sequential Query Recommendations. In: 13th Asian Conference on Machine Learning (ACML 2021), 17-19 Nov 2021, pp. 564-579.

2020

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Chawla, Sanjay (2020) Simple and effective neural-free soft-cluster embeddings for item cold-start recommendations. Data Mining and Knowledge Discovery, 34(5), pp. 1560-1588. (doi: 10.1007/s10618-020-00708-6)

Mohamed, Aisha, Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Kaoudi, Zoi and Aboulnaga, Ashraf (2020) Popularity Agnostic Evaluation of Knowledge Graph Embeddings. In: Thirty-Sixth Conference on Uncertainty in Artificial Intelligence (UAI 2020), 3-6 Aug 2020, pp. 1059-1068.

2018

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Vijayakumar, Nishant and Chawla, Sanjay (2018) SAGA: A Submodular Greedy Algorithm for Group Recommendation. In: Thirty-Second AAAI Conference on Artificial Intelligence (AAAI-18), New Orleans, LA, USA, 2-7 Feb 2018, pp. 3900-3908.

2017

Sarkar, Somwrita, Chawla, Sanjay, Ahmad, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Srivastava, Jaideep, Hammady, Hosam, Filali, Fethi, Znaidi, Wasim and Borge-Holthoefer, Javier (2017) Effective urban structure inference from traffic flow dynamics. IEEE Transactions on Big Data, 3(2), pp. 181-193. (doi: 10.1109/TBDATA.2016.2641003)

2016

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Usunier, Nicolas and Grandvalet, Yves (2016) A Coverage-Based Approach to Recommendation Diversity On Similarity Graph. In: Proceedings of the 10th ACM Conference on Recommender Systems (RecSys '16), Boston, MA, USA, 15-19 Sept 2016, pp. 15-22. ISBN 9781450340359 (doi: 10.1145/2959100.2959149)

2014

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Usunier, Nicolas and Grandvalet, Yves (2014) Optimizing F-measures by Cost-sensitive Classification. In: Advances in Neural Information Processing Systems 27 (NIPS 2014), Montreal, Canada, 8-13 Dec 2014, pp. 2123-2131.

This list was generated on Wed Jul 9 19:27:43 2025 BST.
Jump to: Articles | Conference Proceedings
Number of items: 21.

Articles

Al-Fahad, Saleh, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Kolomvatsos, Kostas (2025) Node selection using adversarial expert-based multi-armed bandits in distributed computing. Computing, 107(3), 85. (doi: 10.1007/s00607-025-01443-w)

Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Alfahad, Saleh Abdullah M. (2024) Thompson sampling-based recursive block elimination for dynamic assignment under limited budget in pure-exploration. Data Mining and Knowledge Discovery, (Accepted for Publication)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962 (2024) Sequential query prediction based on multi-armed bandits with ensemble of transformer experts and immediate feedback. Data Mining and Knowledge Discovery, 38(6), pp. 3758-3782. (doi: 10.1007/s10618-024-01057-4)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Chawla, Sanjay (2020) Simple and effective neural-free soft-cluster embeddings for item cold-start recommendations. Data Mining and Knowledge Discovery, 34(5), pp. 1560-1588. (doi: 10.1007/s10618-020-00708-6)

Sarkar, Somwrita, Chawla, Sanjay, Ahmad, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Srivastava, Jaideep, Hammady, Hosam, Filali, Fethi, Znaidi, Wasim and Borge-Holthoefer, Javier (2017) Effective urban structure inference from traffic flow dynamics. IEEE Transactions on Big Data, 3(2), pp. 181-193. (doi: 10.1109/TBDATA.2016.2641003)

Conference Proceedings

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, LI, WENHAO, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Korobilis, Dimitris ORCID logoORCID: https://orcid.org/0000-0001-9146-3008 (2025) CluE: Cluster, Sample & Eliminate - Bayesian Block Elimination for Pure Exploration with Non-binary Rewards and Limited Budget. In: IEEE ICDCS 2025 45th IEEE International Conference on Distributed Computing Systems, Glasgow, Scotland UK, 20-23 July 2025, (Accepted for Publication)

Al-Fahad, Saleh Abdullah, Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 (2025) Gradient Bandit Experts for Node Selection in Edge Computing. In: IEEE ICDCS 2025 45th IEEE International Conference on Distributed Computing Systems, Glasgow, Scotland UK, 20-23 July 2025, (Accepted for Publication)

Tan, Zhuoran, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Parambath, Sham P. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Xiao, Ke and Singer, Jeremy ORCID logoORCID: https://orcid.org/0000-0001-9462-6802 (2025) Unified Parallel Semantic Log Parsing based on Causal Graph Construction for Attack Attribution. In: 45th IEEE International Conference on Distributed Computing Systems (ICDCS), Glasgow, UK, 20-23 July 2025, (Accepted for Publication)

Forstenhaeusler, Maximilian, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Külzer, Daniel and Weber, Natascha (2025) Leveraging Federated Learning for Decentralized Semi-Supervised Task-Informed Representation Learning on Sequential Data. In: 45th IEEE International Conference on Distributed Computing Systems (IEEE ICDCS 2025), Glasgow, UK, 20-23 July 2025,

Tan, Zhuoran, Wang, Qiyuan, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Singer, Jeremy ORCID logoORCID: https://orcid.org/0000-0001-9462-6802 and Temple, Sam (2025) Distributed Log-driven Anomaly Detection System Based on Evolving Decision Making. In: 45th IEEE International Conference on Distributed Computing Systems (IEEE ICDCS 2025), Glasgow, UK, 20-23 July 2025, (Accepted for Publication)

Li, Wenhao, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Bryson, Kevin ORCID logoORCID: https://orcid.org/0000-0002-1163-6368 (2024) LIFE: Leader-driven Hierarchical & Inclusive Federated Learning. In: 2024 IEEE International Conference on Big Data (IEEE BigData 2024), Washington D.C., USA, 15-18 Dec 2024, (Accepted for Publication)

Aladwani, Tahani, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Deligianni, Fani ORCID logoORCID: https://orcid.org/0000-0003-1306-5017 (2024) CL-FML: Cluster-based & Label-aware Federated Meta-Learning for On-Demand Classification Tasks. In: 11th IEEE International Conference on Data Science and Advanced Analytics (DSAA 2024), San Diego, CA, United States, 6-10 October 2024, (doi: 10.1109/DSAA61799.2024.10722828)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Al-Fahad, Saleh Abdullah M., Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Kolomvatsos, Kostas (2024) Sequential Block Elimination for Dynamic Pricing. In: The 2nd International Workshop on Data Mining in Finance (DMF 2024) at the IEEE International Conference on Data Mining, Abu Dhabi, United Arab Emirates, 09-12 Dec 2024, (Accepted for Publication)

Aladwani, Tahani, Parambath, Sham ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757 and Deligianni, Fani ORCID logoORCID: https://orcid.org/0000-0003-1306-5017 (2024) The Price of Labelling: A Two-Phase Federated Self-Learning Approach. In: European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD 2024), Vilnius, Lithuania, 9-13 September 2024, (Accepted for Publication)

Long, Qianyu ORCID logoORCID: https://orcid.org/0000-0002-8298-2380, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Puthiya, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385 and Bi, Daning (2024) FedDIP: Federated Learning with Extreme Dynamic Pruning and Incremental Regularization. In: IEEE ICDM 2023, Shanghai, China, 1-4 December 2023, pp. 1187-1192. ISBN 9798350307887 (doi: 10.1109/ICDM58522.2023.00146)

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Liu, Siwei, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962 and Ounis, Iadh ORCID logoORCID: https://orcid.org/0000-0003-4701-3223 (2022) Parameter Tuning of Reranking-based Diversification Algorithms using Total Curvature Analysis. In: 8th ACM SIGIR International Conference on the Theory of Information Retrieval (ICTIR 2022), Madrid, Spain, 11-12 July 2022, ISBN 9781450394123 (doi: 10.1145/3539813.3545135)

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Anagnostopoulos, Christos ORCID logoORCID: https://orcid.org/0000-0003-1517-6757, Murray-Smith, Roderick ORCID logoORCID: https://orcid.org/0000-0003-4228-7962, MacAvaney, Sean ORCID logoORCID: https://orcid.org/0000-0002-8914-2659 and Zervas, Evangelos (2021) Max-Utility Based Arm Selection Strategy for Sequential Query Recommendations. In: 13th Asian Conference on Machine Learning (ACML 2021), 17-19 Nov 2021, pp. 564-579.

Mohamed, Aisha, Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Kaoudi, Zoi and Aboulnaga, Ashraf (2020) Popularity Agnostic Evaluation of Knowledge Graph Embeddings. In: Thirty-Sixth Conference on Uncertainty in Artificial Intelligence (UAI 2020), 3-6 Aug 2020, pp. 1059-1068.

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Vijayakumar, Nishant and Chawla, Sanjay (2018) SAGA: A Submodular Greedy Algorithm for Group Recommendation. In: Thirty-Second AAAI Conference on Artificial Intelligence (AAAI-18), New Orleans, LA, USA, 2-7 Feb 2018, pp. 3900-3908.

Puthiya Parambath, Shameem A. ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Usunier, Nicolas and Grandvalet, Yves (2016) A Coverage-Based Approach to Recommendation Diversity On Similarity Graph. In: Proceedings of the 10th ACM Conference on Recommender Systems (RecSys '16), Boston, MA, USA, 15-19 Sept 2016, pp. 15-22. ISBN 9781450340359 (doi: 10.1145/2959100.2959149)

Puthiya Parambath, Shameem ORCID logoORCID: https://orcid.org/0000-0002-5338-9385, Usunier, Nicolas and Grandvalet, Yves (2014) Optimizing F-measures by Cost-sensitive Classification. In: Advances in Neural Information Processing Systems 27 (NIPS 2014), Montreal, Canada, 8-13 Dec 2014, pp. 2123-2131.

This list was generated on Wed Jul 9 19:27:43 2025 BST.

Supervision

Teaching

Database Theory & Applications

Additional information

Reviewer for AISTATS 2025, 2023, 2022; KDD 2024, 2025; AAAI 2024, 2021, 2020, 2019; CIKM 2020; SDM 2020