Valentin Wagner

Super excited to introduce

✨ AnyUp: Universal Feature Upsampling 🔎

Upsample any feature - really any feature - with the same upsampler, no need for cumbersome retraining.
SOTA feature upsampling results while being feature-agnostic at inference time.

🌐 wimmerth.github.io/anyup/

The #ICCV2025 main conference open access proceedings is up:

openaccess.thecvf.com/ICCV2025

Workshop papers will be posted shortly. Aloha!

Andrej Karpathy & @karpathy X.com Excited to release new repo: nanochat! (it's among the most unhinged I've written). Unlike my earlier similar repo nanoGPT which only covered pretraining, nanochat is a minimal, from scratch, full-stack training/inference pipeline of a simple ChatGPT clone in a single, dependency-minimal codebase. You boot up a cloud GPU box, run a single script and in as little as 4 hours later you can talk to your own LLM in a ChatGPT-like web Ul. It weighs ~8,000 lines of imo quite clean code to: - Train the tokenizer using a new Rust implementation - Pretrain a Transformer LLM on FineWeb, evaluate CORE score across a number of metrics - Midtrain on user-assistant conversations from SmolTalk, multiple choice questions, tool use. - SFT, evaluate the chat model on world knowledge multiple choice (ARC-E/C, MMLU), math (GSM8K), code (HumanEval) - RL the model optionally on GSM8K with IPDDOI

- RL the model optionally on GSM8K with "GRPO" - Efficient inference the model in an Engine with KV cache, simple prefill/ decode, tool use (Python interpreter in a lightweight sandbox), talk to it over CLI or ChatGPT-like WebUl. - Write a single markdown report card, summarizing and gamifying the whole thing. Even for as low as ~$100 in cost (~4 hours on an 8XH100 node), you can train a little ChatGPT clone that you can kind of talk to, and which can write stories/poems, answer simple questions. About ~12 hours surpasses GPT-2 CORE metric. As you further scale up towards ~$1000 (~41.6 hours of training), it quickly becomes a lot more coherent and can solve simple math/code problems and take multiple choice tests. E.g. a depth 30 model trained for 24 hours (this is about equal to FLOPs of GPT-3 Small 125M and 1/1000th of GPT-3) gets into 40s on MMLU and 70s on ARC-Easy, 20s on GSM8K, etc. My goal is to get the full "strong baseline" stack into one cohesive, minimal, readable, hackable, maximally forkable repo. nanochat will be the capstone project of LLM101n (which is still being developed). I think it also has potential to grow

developed). I think it also has potential to grow into a research harness, or a benchmark, similar to nanoGPT before it. It is by no means finished, tuned or optimized (actually I think there's likely quite a bit of low-hanging fruit), but I think it's at a place where the overall skeleton is ok enough that it can go up on GitHub where all the parts of it can be improved. Link to repo and a detailed walkthrough of the nanochat speedrun is in the reply. nanochat

Karpathy: nanochat

A small training+inference pipeline for creating your own LLM from scratch

$100 will get you a somewhat functional model

$1000 is more coherent & solves math

detailed walkthrough: github.com/karpathy/nan...

repo: github.com/karpathy/nan...

Working on representation learning for Earth Observation?
Come join the discussion at the EurIPS workshop "REO: Advances in Representation Learning for Earth Observation"

Call for papers deadline: October 15, AoE
Workshop site: sites.google.com/view/reoeurips

@euripsconf.bsky.social @esa.int

🐝 The #3DV2026 Nectar Track is open for submissions!
1️⃣ Spotlight Track: Showcase your strong paper from recent venues with an oral presentation + poster.
2️⃣ Exploration Edge Track: Present preliminary ideas, research hurdles, or demos in a poster session.
More details: ⬇️

This marks the kick-off of our #CVPR2026 coverage! I’m @csprofkgd.bsky.social, and more publicity chairs will be joining in soon.

The key #CVPR2026 dates are now posted. One highlight: the supplementary materials deadline comes a full week AFTER the main paper deadline.

MapAnything: Universal Feed-Forward Metric 3D Reconstruction

@nikv9.bsky.social et al.

tl;dr: flexible input & metric output version of VGGT

arxiv.org/abs/2509.13414

Great to see more initiatives to bring conferences/events to Europe 🇪🇺. Reducing unnecessary co2 emissions caused by long-distance flights and simultaneously strengthening europe as research location.

#ICML2025 test of time award

from gremllm import Gremllm # Be sure to tell your gremllm what sort of thing it is counter = Gremllm('counter') counter.value = 5 counter.increment() print(counter.value) # 6? print(counter.to_roman_numerals()) # VI?

The is diabolical... a Python object that hallucinates method implementations on demand any time you call them, using my LLM Python library github.com/awwaiid/grem...

We just released COLMAP v3.12, which adds long-awaited, end-to-end support for multi-camera rigs and 360° panoramas 👀 COLMAP just got better at handling your robotics, AR/VR, or 360 data - try it yourself and let us know! github.com/colmap/colma... Kudos to Johannes & team for this great work 🚀

#CVPR2025 paper statistics

The #CVPR2025 main conference open access proceedings is up:

openaccess.thecvf.com/CVPR2025

Workshop papers will be posted shortly. Stay tuned...

A screenshot of the important dates for the WACV2026 submission process.

The #WACV2026 Call for Papers is live at wacv.thecvf.com/Conferences/...! First round paper registration is coming up on July 11th, with the submission deadline on July 18th (all deadlines are 23:59 AoE).

Working on camera calibration or camera pose estimation? Want to finally know how calibrations and poses are obtained for the data you ae using?
Come join us at the CALIPOSE workshop at @iccv.bsky.social

Details are on the workshop website: sites.google.com/view/calipos...

Heat-map style graphic of Arctic sea ice extent anomalies for every day from 1 January 1979 through 31 December 2024. Blue shading is shown for greater sea ice, and red shading is shown for less sea ice. The baseline is 1981 to 2010. The graphic is in units of million square kilometers from -3 to +3. Data from NSIDC.

Mosaic of daily #Arctic sea-ice extent anomalies over the last four decades or so. Another way of visualizing the long-term trend.

Graphic from zacklabe.com/arctic-sea-i...

🚀Join the 𝐒𝐜𝐚𝐧𝐍𝐞𝐭++ 𝐂𝐡𝐚𝐥𝐥𝐞𝐧𝐠𝐞 @ CVPR 2025!
Think your method can handle large-scale 3D scenes?
Put it to the test:
kaldir.vc.in.tum.de/scannetpp/cv...

Updates:
✅ Preprocessed, undistorted DSLR images
✅ 3DGS demo: github.com/scannetpp/3D...

by Yueh-Cheng Liu, @cyeshwanth.bsky.social

Great thread about the evolution of radiance fields!

🌍 Guessing where an image was taken is a hard, and often ambiguous problem. Introducing diffusion-based geolocation—we predict global locations by refining random guesses into trajectories across the Earth's surface!

🗺️ Paper, code, and demo: nicolas-dufour.github.io/plonk

Announcing the Test of Time awards for ICLR 2025! This award recognizes papers published ten years ago at ICLR 2015 that have had a lasting impact on the field. Congratulations to the authors!

blog.iclr.cc/2025/04/14/a...

Great tool to keep up to date with papers and for finding related works 📚

💻We've released the code for our #CVPR2025 paper MAtCha!

🍵MAtCha reconstructs sharp, accurate and scalable meshes of both foreground AND background from just a few unposed images (eg 3 to 10 images)...

...While also working with dense-view datasets (hundreds of images)!

#IMC2025 @cvprconference.bsky.social challenge is online!
This year:
- back to collection_mapping: directory with many (similar) scenes->your job to SfM & cluster them
- a bit more of training set
- no transparent objects

$50000 prize fund
Deadline: June 2
www.kaggle.com/competitions...
#IMW2025

a yellow padlock with a smiling face on it ALT: a yellow padlock with a smiling face on it

ACHIEVEMENT UNLOCKED: We have a NEW bold number for total submissions! This year #ICCV2025 has 11239 submissions in review 😅

The previous record was 8088 at #ICCV2023.

Inside arXiv—the Most Transformative Platform in All of Science Modern science wouldn’t exist without the online research repository known as arXiv. Three decades in, its creator still can’t let it go.

Modern science wouldn’t exist without the online research repository known as arXiv. Three decades in, its creator still can’t let it go.

Enjoying your first day at #3DV2025 but wondering where to find the PDF for the papers you like? We got you!

We just updated the website and now you can find the PDF link on OpenReview for every paper at 3dvconf.github.io/2025/accepte...

1) Open up image

2) Search around the middle

3) Find the small, bright dot just left of centre

4) Congratulations! You've found the Curiosity rover on Mars, imaged from orbit.

Line graph time series of 2025's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2024. 2025 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and April by looking at the decadal average line positions.

Monday ice update - #Arctic sea ice extent is currently the *lowest* on record (JAXA data)

• about 780,000 km² below the 2010s mean
• about 1,450,000 km² below the 2000s mean
• about 2,010,000 km² below the 1990s mean
• about 2,370,000 km² below the 1980s mean

Plots: zacklabe.com/arctic-sea-i... 🧪

January 2025 was the warmest January ever recorded. Last month was 1.75°C above the pre-industrial level and 0.79°C above the 1991-2020 average. The persistence of high temperatures underscores significant climate trends.

Read the full #C3S Climate Bulletins: bit.ly/3EBUTD1