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davrens101/README.md

Davis Rens

Co-founder and Chief Scientific Officer at SuperMatics, accelerating superconductor R&D with quantum-mechanical simulation, machine learning and real laboratory data. Previously at Rigetti Computing and Berkeley Lab. Based in Berkeley, California.

LinkedIn · SuperMatics

What I work on

I'm a generalist drawn to problems at the intersection of machine learning, scientific computing, and the physical world: how models learn, where they fail, and how to turn their predictions into useful decisions.

  • Learning and generative models: optimization, representations, and the numerical details that make training and inference behave as intended.
  • Reliable AI systems: LLM serving, tool use, and evaluation, with a focus on correctness across streaming, batching, and persistent state.
  • AI for discovery: combining simulation, uncertainty, and experimental data to decide what to measure, test, or build next.
  • Computation meets physics: superconducting materials, quantum hardware, and cryogenics, where computational models have to respect physical constraints.

Selected pull requests

Selected correctness and reliability work across AI/ML, generative media, and scientific computing.

Project Pull request
huggingface/diffusers Align per-token flow-matching velocity conventions across schedulers and video pipelines
sgl-project/sglang Correct streaming of multiple DeepSeek V3.1 tool calls
vllm-project/vllm Preserve response text preceding reasoning blocks instead of silently dropping it
pyg-team/pytorch_geometric Prevent undirected negative sampling from returning edges already present in the graph
huggingface/lerobot Prevent FP16 normalization NaNs caused by epsilon underflow on constant coordinates
dmlc/xgboost Reset early-stopping state between training runs when a callback is reused
pytorch/rl Restore CISPO policy gradients for clipped tokens to match the learning objective
pytorch/vision Make right-angle tensor rotations exact and fix expanded image dimensions
openai/whisper Accept NumPy scalar temperatures without crashing speech transcription
Comfy-Org/ComfyUI Prevent NaN noise schedules in single-step KL-optimal sampling

How I contribute

  1. Start from issues a maintainer has already accepted, and check nobody else is on them.
  2. Reproduce first. Add a test that fails without the fix, then make the smallest change that passes it.
  3. Show before and after evidence, run the project's own checks, and report honestly which ones fail and why.
  4. I use AI coding tools for research and drafting. I review every change myself and disclose AI assistance in each pull request, following each project's policy.

Pinned Loading

  1. openai/whisper openai/whisper Public

    Robust Speech Recognition via Large-Scale Weak Supervision

    Python 113k 13.7k

  2. pytorch/pytorch pytorch/pytorch Public

    Tensors and Dynamic neural networks in Python with strong GPU acceleration

    Python 105k 30.7k

  3. huggingface/diffusers huggingface/diffusers Public

    🤗 Diffusers: State-of-the-art diffusion models for image, video, and audio generation in PyTorch.

    Python 34.9k 7.5k

  4. Comfy-Org/ComfyUI Comfy-Org/ComfyUI Public

    The most powerful and modular diffusion model GUI, api and backend with a graph/nodes interface. The fastest local inference engine in the world.

    Python 147k 17.5k

  5. vllm-project/vllm vllm-project/vllm Public

    A high-throughput and memory-efficient inference and serving engine for LLMs

    Python 96.9k 24.8k

  6. hiyouga/LlamaFactory hiyouga/LlamaFactory Public

    Unified Efficient Fine-Tuning of 100+ LLMs & VLMs (ACL 2024)

    Python 76k 9.4k