Introduction
Hi, I am Subhransu Sekhar Bhattacharjee (Bangla: শুভ্রাংশু-শেখর ভট্টাচার্য), nickname: Rudra (রুদ্র). I am an international research scholar at the ANU School of Computing since April 2023.
Education
I graduated with First Class Honours in Mechatronics at ANU, minoring in Electronic Communication Systems and Mathematics. My honours thesis, advised by Prof. Ian Petersen, was titled "Whiplash Inertial Gradient Descent Dynamics," and was later published as a journal paper J1. You can find the complete version here.
Research
I am a PhD candidate in the School of Computing at the Australian National University, working on autonomous spatio-semantic reasoning under uncertainty with Dr. Rahul Shome, Dr. Dylan Campbell, and Prof. Stephen Gould.
My thesis develops efficient generative world models of 3D indoor environments that turn partial, noisy observations into calibrated spatial–semantic priors for robotic planning and decision-making. Recent work appears at CVPR 2025 as Unobserved Object Detection.
My research interests include the following:
- 3D generative world models and scene priors: Probabilistic models that infer occluded geometry and semantics from sparse observations to produce uncertainty-aware scene representation.
- World models for planning, Visuomotor control, RL and Imitation Learning: Using learned environment and dynamics models as decision primitives for motion planning, active search, learning visuomotor control or policy for imitation learning and model-based RL in partially observed settings.
- Efficient generative modelling and uncertainty quantification: Scalable, sample- and compute-efficient generative modelling with guarantees on calibration, coverage, and robustness of multi-stage inference pipelines, especially under distributional shift.
- High-dimensional inverse problems in physics and quantitative finance: Building risk-sensitive inference tools for noisy timeseries data to build 3D physics-based inference systems and pricing models.
If you are interested in collaborating with me, please reach out!
Hobbies
Outside research, I enjoy slow travel, theatre and long games of chess, and I am especially drawn to films with nonlinear narratives. I also love reading epics, modern classics and travelouges. I sketch and paint from time to time, experiment with cocktails for friends, look for unusual hiking routes, swim in the sea, and listen to audiobooks.