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Basics

Name Piyush Tiwary
Label Researcher
Summary PhD Researcher and Prime Minister's Research Fellow at Indian Institute of Science

Work

  • 2025.07 - 2026.01
    Google DeepMind
    Student Researcher
    Enhancing VLMs via GRPO for Geospatial Image Segmentation
    • Worked with the Anthrokrishi Team (GDM DeepMind) to segment agricultural land in high-resolution satellite imagery using vision-LLMs without any decoder head.
    • Scaled Text4Seg to geospatial resolutions and applied RLHF via GRPO to enable image-level reward signals for post-training in vLLMs.
    • Demonstrated that GRPO-based post-training improves VLM segmentation performance by ~16% on satellite data compared to existing VLM-baselines.
  • 2024.05 - 2024.08
    Adobe Research
    Research Intern
    Image Recolorization using Diffusion Priors
    • Developed a multi-modal image recoloring pipeline using Diffusion models, supporting diverse input conditions (text, stroke, exemplars).
    • Designed modules to convert user conditions into unified hint-points and perform color transfer on images.
    • Applied score-correction to hint-points for accurate recoloring via inference on ddim-inverted image latents leading to ~81% accuracy on instruct-colorization.
  • 2020.05 - 2020.08
    CapitalVia Global Research Limited - Investment Advisor
    SDE Intern
    Developing deployable parameter optimization framework for trading strategies using back-testing results on previous data
  • 2019.05 - 2019.08
    International Institute of Information Technology Bangalore, India
    Research Intern
    Speaker Diarization using UIS-RNN under Prof. Manish Gupta
  • 2018.05 - 2018.08
    Indian Institute of Technology Patna, India
    Research Intern
    Location tracking in faded IoT Environment under Prof. Sudhir Kumar

Volunteer

Education

  • 2021.01 - Present

    Bangalore, India

    PhD
    Indian Institute of Science, Bangalore, India
    PhD (Prime Minister's Research Fellow)
    • Stochastic Models & Applications
    • Pattern Recognition & Neural Network
    • Reinforcement Learning
    • Advanced Image Processing
    • Information Theory
    • Computational Methods in Optimization
    • Foundations of Data Science
    • Measure Theoretic Probability Theory
    • Stochastic Approximation Algorithms
  • 2017.01 - 2021.01

    Patna, India

    Bachelor of Technology
    Indian Institute of Technology Patna (IIT Patna), India
    Electrical Engineering

Awards

Languages

English
Fluent
Hindi
Native speaker
Bhojpuri
Native speaker
Marathi
Limited proficiency