Valentin Ștefan

There are now millions of publicly-available AI models – which one is right for you?

We introduce CODA ( #ICCV2025 Highlight! ), a method for *active model selection.* CODA selects the best model for your data with any labeling budget – often as few as 25 labeled examples. 1/

@iccv.bsky.social

13.10.2025 18:00 — 👍 12    🔁 6    💬 2    📌 1

Too many mediocre men talk over capable women.

Study of problem-solving teams: Men dominate the conversation, taking 50% more turns and saying 69% more than women. Men with low skill speak more than women with high skill.

It's long past time to value competence over confidence.

12.12.2025 16:09 — 👍 130    🔁 38    💬 2    📌 7

Harnessing the power of AI for biodiversity monitoring with camera trap networks - From foundation model to edge processing

📢Please share📢 We have an opening for an exciting fully-funded PhD project on computer vision and machine learning applied to biodiversity monitoring with amazing Serge Belongie @belongielab.org and @aicentre.dk. Application deadline coming up on 15 January!
phd.tech.au.dk/for-applican...

02.01.2026 13:09 — 👍 19    🔁 15    💬 1    📌 3

Flowers for habitat enhancement primarily benefit common insect pollinators across temperate grasslands Flowers that are attractive and occupy a complementary position in interaction space could be prioritized in flower mixes to recover rare and specialized pollinators. By defining the ecological roles...

Turns out, a lot of the plants we use for bee habit enhancement are already common and mostly support those darn common generalists!

Thanks @joseblanuza.bsky.social for the help getting this across the line

besjournals.onlinelibrary.wiley.com/doi/10.1111/...

20.11.2025 13:10 — 👍 15    🔁 6    💬 0    📌 0

‼️🚨My first PhD paper out in @methodsinecoevol.bsky.social

We built an automated camera system to detect plant–pollinator interactions (day & night) and compared networks from cameras vs. focal observations.

📜👉 doi.org/10.1111/2041...

@annatraveset.bsky.social
@imedea.bsky.social

31.10.2025 11:55 — 👍 20    🔁 8    💬 1    📌 1

Excited to share a new paper led by our colleagues at #DLR! We trained AI to recognize 15 European fly pollinator families and estimate how confident it is, helping ecologists use AI more responsibly.
Paper: lnkd.in/dBAWW3hB
Code: lnkd.in/du7dD2hc

#pollinators #aiforgood #aifornature #UFZ #iDiv

07.10.2025 12:44 — 👍 1    🔁 1    💬 0    📌 0

#AIForGood #Biodiversity #NatureTech #Pollinators #Research #OpenScience #AI #ObjectDetection #ComputerVision #DeepLearning #MachineLearning #NeuralNetworks

13.04.2025 18:03 — 👍 0    🔁 0    💬 0    📌 0

Successes and limitations of pretrained YOLO detectors applied to unseen time-lapse images for automated pollinator monitoring Pollinating insects provide essential ecosystem services, and using time-lapse photography to automate their observation could improve monitoring efficiency. Computer vision models, trained on clear c...

Check out the preprint here www.researchsquare.com/article/rs-6... and the code here github.com/valentinitne...

13.04.2025 18:03 — 👍 0    🔁 0    💬 0    📌 0

Our latest research explores how YOLO object detectors, trained on citizen science images, perform on unseen time-lapse images of pollinators captured with a fixed smartphone setup. While successful for larger pollinators, detecting smaller or blurrier flower visitors remains a challenge.

13.04.2025 18:03 — 👍 1    🔁 0    💬 1    📌 1

Scatterplot titled “Empirical Evidence of Ideological Targeting in Federal Layoffs: Agencies seen as liberal are significantly more likely to face DOGE layoffs.” • The x-axis represents Perceived Ideological Leaning of federal agencies, ranging from -2 (Most Liberal) to +2 (Most Conservative), based on survey responses from over 1,500 federal executives. • The y-axis shows Agency Size (Number of Staff) on a logarithmic scale from 1,000 to 1,000,000. Each point represents a federal agency: • Red dots indicate agencies that experienced DOGE layoffs. • Gray dots indicate agencies with no layoffs. Key Observations: • Liberal-leaning agencies (left side of the plot) are disproportionately represented among red dots, indicating higher layoff rates. • Notable targeted agencies include: • HHS (Health & Human Services) • EPA (Environmental Protection Agency) • NIH (National Institutes of Health) • CFPB (Consumer Financial Protection Bureau) • Dept. of Education • USAID (U.S. Agency for International Development) • The National Nuclear Security Administration (DOE), despite its conservative leaning (+1 on the scale), is an exception among targeted agencies. • A notable outlier: the Department of Veterans Affairs (moderately conservative) also faced layoffs despite its size. Takeaway: The figure visually demonstrates that DOGE layoffs disproportionately targeted liberal-leaning agencies, supporting claims of ideological bias. The pattern reveals that layoffs were not driven by agency size or budget alone but were strongly associated with perceived ideology. Source: Richardson, Clinton, & Lewis (2018). Elite Perceptions of Agency Ideology and Workforce Skill. The Journal of Politics, 80(1).

The DOGE firings have nothing to do with “efficiency” or “cutting waste.” They’re a direct push to weaken federal agencies perceived as liberal. This was evident from the start, and now the data confirms it: targeted agencies overwhelmingly those seen as more left-leaning. 🧵⬇️

20.02.2025 02:18 — 👍 10694    🔁 4796    💬 253    📌 397

EuPPollNet: A European Database of Plant‐Pollinator Networks Motivation Pollinators play a crucial role in maintaining Earth's terrestrial biodiversity. However, rapid human-induced environmental changes are compromising the long-term persistence of plant-pol...

[new paper] EuPPollNet: A European Database of Plant-Pollinator Networks
onlinelibrary.wiley.com/doi/10.1111/... Another wonderful paper of @joseblanuza.bsky.social making open more than >1500 networks and looking at their properties. Come for the data, stay for the cool figures!

04.02.2025 08:00 — 👍 102    🔁 52    💬 7    📌 2

2025 starts with a methodology publication by Ștefan et al. on Utilising affordable smartphones and open-source time-lapse photography for pollinator image collection and annotation - Happy new year!
doi.org/10.26786/192...

10.01.2025 16:22 — 👍 30    🔁 15    💬 1    📌 3

Summerschool 2025: Deep learning for biodiversity and ecological research | iDiv

Our research center (iDiv) will host a very interesting summer school (25 – 29 August 2025) - Deep learning for biodiversity and ecological research.
More details here: www.idiv.de/events/summe...

#biodiversity #education #aiforgood #technology #idiv

28.01.2025 12:06 — 👍 0    🔁 0    💬 0    📌 0