David Barber

Director UCL Centre for AI and UiPath Distinguished Scientist. Co-founder Pro: cycling, walking, EU. Views my own.

[Wenlin @WenlinChen_]

🚀 NEW: DiffRatio achieves SOTA one-step image generation WITHOUT teacher supervision!

Instead of separately estimating teacher & student scores (causing bias), we directly learn the score difference using a density-ratio network.

✨ Better quality & 50% less memory! 🧵👇

[David Barber @davidobarber]

Funding for dataset creation and challenge projects from the UK Hub in Generative Models. Deadline 24th Feb 2026. Please forward. https://t.co/KIc2YuOlWl

[PageIndex @PageIndexAI]

@unwind_ai_ Thanks for the shoutout! Vectorless, vision-based RAG — without OCR.
🧩 Powered by PageIndex's agentic in-context index & reasoning-native, human-like retrieval.

🚀Agent Platform: https://t.co/ZCoTGa2Pkz
📦GitHub: https://t.co/Q4KBfnLI4b
🛠️Notebook: https://t.co/G3D8mlwMqu

[PageIndex @PageIndexAI]

📄 Want to upload local long PDFs on Claude but get context limit reached errors?

🚀 In Claude Desktop, you can use PageIndex to upload your local files directly — no more context limits.

👉 Easy setup at https://t.co/pp1tzNnBnM.
🆓 1,000 pages free.

#PageIndex #RAG #Claude

[PageIndex @PageIndexAI]

Meet the first long-context OCR — PageIndex OCR.
It can convert PDFs to Markdown with the document structure preserved.
📄 Upload a PDF
⚡ Get Markdown output (global structure preserved)
🌳 Navigate the hierarchical structure of the document

🆓 Try it now with 200 pages free: https://t.co/AuAnhe16jp

#PageIndex #OCR #AI #LLM #RAG #DocumentAI #LLMReady

[David Barber @davidobarber]

Please do consider submitting to the ICML Workshop on Computer Use Agents. Deadline May 18. https://t.co/rZiAwFHcPo

[ComputerUseAgents Workshop @workshopcua]

🚀Announcing the Workshop on Computer Use Agents at #ICML2025 in July, Vancouver!

Join us, to advance research on AI agents performing real-world computer tasks.

🤖Call for Papers & Demos: Deadline May 18, 2025
🎙️Exciting speaker lineup announced!
✍️Interested in reviewing? Register now!
✈️Travel grants available to support participation.

Follow us for updates! #WCUA #CUA #AI #ML #ComputerUseAgents #Agents #icml2025

Website link below 👇

[PageIndex @PageIndexAI]

Tired of the poor accuracy of similarity-based retrieval on long documents? You need reasoning-based RAG. We've open-sourced PageIndex — a tool for building indexes optimized for reasoning-based RAG and deep research.
https://t.co/Q4KBfnLI4b

[UCL Centre for Artificial Intelligence @ai_ucl]

Talk by Nicolas Chopin, Prof of Statistics, Paris, hosted by AI Centre/ ELLIS https://t.co/jpqKXP1oHR
Date: Monday 17th March 2025
Time: 12:30 - lunch; 1-2 - talk
Location: UCL AI Centre, 90 High Holborn

For more info and sign up: https://t.co/gBW60JS7AG

[David Barber @davidobarber]

For the UK Gen AI community, we are inviting submissions for Gen AI research posters to be displayed during our launch event on 4 March at the Crick Institute in London. Please complete this form if you would like to be considered for the exhibition: https://t.co/diKuta1kZ1

[David Barber @davidobarber]

Important article in the FT about the need for the UK to rethink university and PhD funding. PhD students are the lifeblood of research, teaching and innovation. https://t.co/XiGHT4YQJO

[Edward Kim @edawerd]

Anyone can ship AI features quickly, but getting them from OK to great really comes down to the quality of your evaluations. At @GustoHQ, we built our AI workflows around Humanloop, which has been core to shortening our eval cycle time.

Congrats on launching, @humanloop!

[Mingtian @MingtianZhang]

🚀Mafin2 is based on our new MCTS RAG framework, achieving state-of-the-art accuracy for financial data!

[David Barber @davidobarber]

This is a very nice piece of work, showing how to use the optimal form of the denoising covariance to improve generations.

[Zijing Ou @JzinOu]

🚀 We propose a new way to estimate the denoising covariance in diffusion models, which can lead to lower estimation error, better FID and likelihood tradeoff with fewer steps, and improved generation diversity.
ArXiv link: https://t.co/EmPf8RzbWq.
More details below👇

[David Barber @davidobarber]

The UCL Venturer Programme is a new way to fund PhD studentships and Postdocs and create a startup. If you're an investor or corporate looking to access world leading AI talent for innovation, please do join us at the UCL AI Centre on 14th November https://t.co/9J0gcd6cRm

[David Barber @davidobarber]

@radicalvcfund @maxjaderberg @IsomorphicLabs Additionally, @radicalvcfund has launched applications for the first-ever Radical Cloud Cohort, offering selected early-stage AI builders $250K in cloud credits and a year of programming to help scale their businesses. Apply: https://t.co/X7AJfEuUON

[David Barber @davidobarber]

Excited to join @radicalvcfund as a Scientific Advisor. I’ll be starting with the Radical AI Founders Masterclass on Oct 30, in a conversation with @maxjaderberg of @IsomorphicLabs. Register here: https://t.co/MUiBes1bQF

[David Barber @davidobarber]

https://t.co/duQpMHuuJV Application deadline 5th November. See the pdf in the link for more details.

[David Barber @davidobarber]

With funding and mentoring from Google DeepMind @ai_ucl is looking for a Fellow to contribute impactful research in the broad area of sustainable AI. The Fellow will be a proven advocate for increasing participation in AI and an ambassador for inclusion during the Fellowship.

[David Barber @davidobarber]

@wooldridgemike That's great Mike. Well done!

[David Barber @davidobarber]

We show how to take a pretrained model (like Gemma) and extend the context significantly with only linear scaling cost. As good as Mamba and other SOTA models for language modelling but with global context. Great work by @ai_ucl @UiPath https://t.co/9ixjIa3koR