Noah Mitchell

Noah Mitchell

Machine learning researcher

I work on a central question: how can we make learning systems better at solving difficult problems?

Research

Amortizing Search Under Inference Budgets for LLM Reasoning

Noah Mitchell · Preprint

A learned verifier-guided search controller for inference-time reasoning that improves hard-task solve rates while reducing inference compute.

Paper

Building State vs. Using State: Representation and Utilization in Multi-Step Tasks

Noah Mitchell · Preprint

Task-agnostic methods that improve learned-state utilization in language models and reinforcement-learning agents on multi-step tasks.

Paper

The Cost of Absolute Position: A Spread–Expressivity Tradeoff in Transformers

Noah Mitchell*, Isaac Gabriel*, Alexander Wyatt* · Equal contribution · Accepted at NeurIPS 2026

A study of transformer expressivity and positional information, with GPT-2-style experiments scaling to 1.2B parameters on WikiText using PyTorch DDP and H100 GPUs.

Paper

Experience

Machine Learning Engineer Intern

Tower Research Capital · Montréal

May–Sep 2026

  • Designed and evaluated autonomous LLM data agents for subject-matter experts, automating data discovery and reducing a multi-year backlog; built Python and SQL data-processing and retrieval workflows using NumPy and pandas.
  • Developed agentic quantitative-research pipelines to mine data sources, propose candidate signals, and validate hypotheses; trained deep-learning models on market features with reproducible evaluation.

NSERC Researcher

University of Ottawa

Dec 2024–May 2026

  • Co-developed Margin-Aware Quantization, an adversarial-robustness method with a high-probability condition; improved ResNet PGD robustness from 92% to 97% at 99% clean accuracy on MNIST and extended experiments to CIFAR-10.
  • Ran distributed PyTorch DDP training, ablations, and hyperparameter sweeps on Linux and Slurm HPC clusters with multi-node H100 GPUs, using reproducible configurations and experiment tracking.

Machine Learning Research Intern

Kinaxis

Sep–Dec 2024

  • Trained a policy-gradient reinforcement-learning agent for supply-chain graph partitioning, reducing downstream optimization solver time by 33%.
  • Evaluated reward functions, graph features, and rollout strategies; improved preprocessing runtime by 91% through algorithmic optimization.

Software Developer Intern

Emids

Jun–Sep 2024

  • Built an autonomous LLM agent that generates, tests, and refines SQL queries for natural-language data retrieval, reducing complex-query errors by 80%.

Selected Research Projects

Commitment and Revision Circuits in Diffusion Language Models

PyTorch · sparse autoencoders · LLaDA/Dream

Investigated diffusion-language-model token commitment and revision using mechanistic interpretability, sparse autoencoders, hidden-state analysis, and causal interventions; evaluated decoding policies.

Decision-Preserving World-Model Compression

Planning · reinforcement learning

Developed compact world-model representations that preserved near-full planning performance with approximately one percent of the original state space.

Writeup

Award

Hack the North Sponsor Prize · 2024

Built an LLM, vector-database, and AlphaFold application for natural-language gene-sequence generation and verification.

About

I am completing an Honours Bachelor of Mathematics at the University of Ottawa, expected in May 2027, with a 3.8/4.0 GPA. I received the Victor Linis Mathematics Scholarship and an NSERC USRA research grant. My research combines theory and experiment across deep learning, reinforcement learning, optimization, and large-scale empirical systems.

Relevant coursework includes mathematical machine learning, probability, statistics, time-series analysis, linear algebra, algorithms, and operating systems.