Research

Interests: ergodic theory, dynamical systems and machine learning.

Dynamical systems and ergodic theory

Journal articles

  1. 2023
    Slow entropy of some combinatorial constructions
    with P. Kunde and D. Wei
    Nonlinearity 36 (2023), no. 6, 2923–2974.
  2. 2023
    Slow entropy for some Anosov–Katok diffeomorphisms
    with P. Kunde and D. Wei
    Discrete and Continuous Dynamical Systems 43 (2023), 209–255.
  3. 2022
    Real-analytic realization of Uniform Circular Systems and some applications
    with P. Kunde
    Journal d’Analyse Mathématique 148 (2022), no. 2, 399–445.
  4. 2019
    Real-analytic AbC constructions on the torus
    with P. Kunde
    Ergodic Theory and Dynamical Systems 39 (2019), no. 10, 2643–2688.
  5. 2017
    Non-standard real-analytic realizations of some rotations of the circle
    Ergodic Theory and Dynamical Systems 37 (2017), no. 5, 1369–1386.

Preprints and notes

  1. 2024
    Weak mixing behavior for the projectivized derivative extension
    with D. Khurana and P. Kunde
    Preprint.
  2. 2017
    Real-analytic diffeomorphisms with homogeneous spectrum and disjointness of convolutions
    with P. Kunde
    Preprint.
  3. Notes
    Information and entropy in dynamical systems: an introduction
    with F. Ledrappier
    Unpublished notes of the Będlewo lectures delivered by F. Ledrappier.

Machine learning

Conference proceedings

  1. 2022
    SAU: Smooth activation function using convolution with approximate identities
    K. Biswas, S. Kumar, S. Banerjee, A. Pandey
    Computer Vision – ECCV 2022, Lecture Notes in Computer Science 13681, Springer, Cham.
  2. 2022
    Smooth Maximum Unit: Smooth activation function for deep networks using smoothing maximum technique
    K. Biswas, S. Kumar, S. Banerjee, A. Pandey
    Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2022, 784–793.
  3. 2022
    ErfAct and Pserf: Non-monotonic smooth trainable activation functions
    K. Biswas, S. Kumar, S. Banerjee, A. Pandey
    Proceedings of the AAAI Conference on Artificial Intelligence 36 (2022), no. 6, 6097–6105.
  4. 2021
    EIS: Efficient and trainable activation functions for better accuracy and performance
    K. Biswas, S. Kumar, S. Banerjee, A. Pandey
    Artificial Neural Networks and Machine Learning – ICANN 2021, Lecture Notes in Computer Science 12892, Springer, Cham.

Journal articles

  1. 2021
    TanhSoft: Dynamic trainable activation functions for faster learning and better performance
    K. Biswas, S. Kumar, S. Banerjee, A. Pandey
    IEEE Access 9 (2021), 120613–120623.

Preprints

  1. 2021
    Orthogonal-Padé activation functions: Trainable activation functions for smooth and faster convergence in deep networks
    K. Biswas, S. Banerjee, A. K. Pandey
    Preprint.

Other areas

Journal articles

  1. 2024
    Ergodic and mixing quantum channels: From two-qubit to many-body quantum systems
    S. Aravinda, S. Banerjee, R. Modak
    Physical Review A 110 (2024), no. 4, 042607.
  2. 2019
    Revisiting the use of squared magnitude function for the optimal approximation of (1+α)-order Butterworth filter
    S. Mahata, S. Banerjee, R. Kar, D. Mandal
    AEU – International Journal of Electronics and Communications 110 (2019).

Talks and mini-courses

2026

  • AugColloquium, Harish-Chandra Research Institute, Prayagraj
  • JulSeminar, Indian Institute of Science Education and Research Kolkata
  • JunSeminar, Bhaskaracharya Pratishthana, Pune
  • MayISQGD–SS11: Structural and Path-Space Perspectives in Dynamical Systems Online

2025

  • MarWorkshop on Dynamics and Related Topics, Institute for Mathematical Sciences, National University of Singapore

2024

  • OctSpecial Lecture Series, Indian Institute of Technology Tirupati
  • AprTopology & Geometry Seminar, National University of Singapore

2023

  • MarPi-Day Seminar, Indian Institute of Technology Tirupati

2022

  • NovSeminar, Indian Institute of Science Education and Research Tirupati
  • SepETDS Seminar, Tata Institute of Fundamental Research, Mumbai Online
  • JunColloquium, TIFR Centre for Applicable Mathematics, Bangalore

2021

  • MayLowlands Dynamics Seminar (joint with P. Kunde), Vrije Universiteit Amsterdam and Universität Hamburg Online

2020

  • NovDepartment of Mathematics and Statistics Webinar, Indian Institute of Technology Tirupati Online
  • Oct–NovErgodic theory, classification theorems, and holomorphic dynamics, mini-course (joint with S. Mukherjee), Indian Institute of Science Education and Research Kolkata Online

2019

  • SepMathematics Seminar, Jawaharlal Nehru University, Delhi
  • AugFaculty Development Program, Shivaji College and Hansraj College, Delhi

2015

  • MarDynamical Systems Seminar, The Pennsylvania State University

2013

  • MarGaussian dynamical systems (three-part mini-series), Working Seminar: Dynamics and its Working Tools, The Pennsylvania State University