Soroush Esfahanian

Soroush Esfahanian

Research Intern, EPFL NLP Lab
Lausanne, Switzerland

I want to understand how language models reason: the internal mechanisms behind their answers, how those mechanisms emerge through training, and why they sometimes fail.

I am a final-year Computer Engineering student at the University of Tehran and a research intern at EPFL, supervised by Prof. Antoine Bosselut. My current work investigates how distillation configurations affect the reasoning capabilities transferred from teacher to student models.

  • Understanding the internal computations behind reasoning and how pretraining and post-training change them.
  • Using mechanistic interpretability and controlled experiments to study whether a model’s written reasoning reflects how it reaches an answer.
  • Exploring connections with human cognition, especially reasoning about beliefs and intentions.

Previously, at TeIAS, I co-developed PerSo, a benchmark for cognitive and behavioral social intelligence in LLMs. Earlier, I worked on learning-based sound source localization at the University of Tehran’s Human and Robot Interaction Lab.

  1. I joined the NLP Lab at EPFL as a research intern through Summer@EPFL, supervised by Prof. Antoine Bosselut, to study reasoning and distillation in language models.

  2. I joined the LLM Lab at the Tehran Institute for Advanced Studies to develop a benchmark for social intelligence in language models, supervised by Dr. Mohammad Taher Pilehvar and Dr. Yadollah Yaghoobzadeh.

  3. I joined the Human and Robot Interaction Lab at the University of Tehran, supervised by Dr. Mehdi Tale Masouleh, to work on learning-based sound source localization.

EPFL · NLP Lab

Aug 2026–present

Studying how distillation configurations shape reasoning and student behavior in language models. My work compares rollout horizons, prefix sources, and KL directions through checkpoint evaluations, and examines answer-format alignment, reasoning loops, and recovery during training.

TeIAS · LLM Lab

Jun 2025–Jul 2026

Co-developed PerSo, a benchmark evaluating cognitive and behavioral social intelligence in LLMs through real-world persuasion scenarios. Designed belief, emotion, intent, and persuasion-response tasks, built the dataset with LLM-assisted generation and human validation, and evaluated 15 model configurations across five families.

University of Tehran · Human and Robot Interaction Lab

2024

Developed learning-based 3D sound source localization using audio timing and spectral features. Collected audio at 315 locations and evaluated multi-branch neural networks and region classifiers. Published and presented the work at ICRoM 2024.