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COSMO Lab

@labcosmo.bsky.social
1.3K followers 196 following 184 posts

Computational Science and Modelling of materials and molecules at the atomic-scale, with machine learning.

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Reposted by COSMO Lab
marcel ⊙ @marceldotsci.bsky.social · 18/09/2026
✨ new work: "Truncated automatic sparse differentiation for MLIPs" with @adrianhill.de & @micheleceriotti.bsky.social has arrived on the arXiv. In a 🥥: we exploit that MLIP Hessians are sparse and decay with distance with a "truncated" variant of automatic sparse differentiation. See figure. 👇
Truncated automatic sparse differentiation (ASD). (a) Toy chain of 7 atoms, model reach K = 2 hops. The Hessian H is recovered from Hessian-vector products (HVPs) with the columns of a seed matrix S, giving the compressed product HS. Since H is sparse, star coloring needs 5 colors, hence 5 HVPs instead of 7. Each entry of H is read from one entry of HS (its hue), directly or via its symmetric partner; entries that are sums are never read (crossed). Truncating to one hop needs only 3 HVPs, but the neglected two-hop couplings (gray) now contaminate entries that are read (dots), causing errors. (b) MOF-177 with PET-XS: atoms within K = 5 hops of one Zn atom in the model's graph, with its cutoff sphere and one-hop edges; rest of the cell in gray. (c) Same atoms colored by the force-constant block norm ‖Φᵢⱼ‖ to the marked atom, decaying with distance. (d) Whole Hessian of MOF-177, one cell per atom pair, graph neighbors adjacent: hop count above the diagonal, ‖Φᵢⱼ‖ below, zeros white.
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Reposted by COSMO Lab
Matthias Kellner @matthiaskellner.bsky.social · 18/09/2026
We have released ShiftML4! ShiftML4 comes with built-in molecular corrections, elevating the chemical shielding predictions to hybrid-DFT level quality. Try it yourself on shiftml.org, or from the PyPi package.
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COSMO Lab @labcosmo.bsky.social · 30/07/2026
A little holiday reading from 🧑‍🚀: arxiv.org/html/2607.26... , or how Michelangelo used #AI to break equivariant atom-centered descriptors all the way to 7 neighbors (and arbitrary many neighbors when considering a finite, practical level of discretization). 🤯
Atomic structures that are indistinguishable by atom-centered descriptors for ML potentials
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COSMO Lab @labcosmo.bsky.social · 02/07/2026
What will O2, benzene and ozone do on top of a Mendeleev cluster 🤔 ? Thanks to the improved mlip.js webtool from Peter Spackman you can figure it out running #PET-MAD-XS in your browser using webgpu 🚀 . Try it out at @crystalexplorer.net 's amazing MLIP.js peterspackman.github.io/mlip.cpp/
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COSMO Lab @labcosmo.bsky.social · 10/06/2026
Time to learn the action 🏃 ! Today I'm sharing a paper, just published on @physrevlett.bsky.social, showing how to construct a symplectic #machinelearning predictor of classical mechanics by learning the Hamilton-Jacobi action.
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COSMO Lab @labcosmo.bsky.social · 09/06/2026
Afternoon action at the @nccr-marvel.bsky.social / @ictp.bsky.social summer school, with the 🧑‍🚀 team introducing MD with #machinelearning potentials using PET, metatomic and the atomistic-cookbook.org 🧑‍🍳📖
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COSMO Lab @labcosmo.bsky.social · 02/06/2026
📢 Chemiscope 1.0 paper is out on #JOSS. If you haven't used ⚗️ 🔭 recently, head to joss.theoj.org/papers/10.21... to read a summary of the new features, to chemiscope.org to try it out, and type `pip install chemiscope` to use it locally.
chemiscope.org
Chemiscope
Interactive data visualization for materials and molecular databases. Correlate atomic structures and their properties, either online, in a jupyter notebook, or with a portable app.
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COSMO Lab @labcosmo.bsky.social · 03/03/2026
So let us show you just how *universal* #PET-MAD-1.5 can be. This is a movie of a parallel tempering simulation, with replicas from 300K to 3000K, of what we call a "Mendeleev cluster" - one atom each of every element from 1 to 102.
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COSMO Lab @labcosmo.bsky.social · 03/03/2026
📢 We have been working on a new universal atomistic dataset that combines the principles of MAD with a meta-GGA level of theory, so we can all simulate water that does not freeze at 500K 🧊 , and have all our bases covered, with reference data for every isotope with a half-life above 24 hours ☢️
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COSMO Lab @labcosmo.bsky.social · 23/02/2026
New recipe just landed on the atomistic-cookbook.org 🧑‍🍳📖. Thanks to @yairlitman.bsky.social for explaining how to use ipi-code.org to perform ring-polymer instanton calculations of reaction rates that include quantum tunneling effects ⚛️⚡. Check it out 👉 atomistic-cookbook.org/examples/rin...
Snapshot of a ring-polymer instanton calculation for the reaction of methane with a H radical
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COSMO Lab @labcosmo.bsky.social · 18/02/2026
📢 New #preprint is out! Investigating the many flavors of last-layer #UQ, Moritz and 🧑‍🚀Matthias propose a practitioners' guide on "how to train a shallow ensemble". TL;DR? for good calibration use NLL, include force, and optimize the backbone, fine-tuning for speed! 📃🔗➡️ arxiv.org/html/2602.15...
arxiv.org
How to Train a Shallow Ensemble
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COSMO Lab @labcosmo.bsky.social · 14/02/2026
Many #machinelearning potentials are built (or understood) in terms of "atomic cluster expansions" that link directly to a body-ordered energy decomposition that can be computed explicitly with a sequence of electronic structure calculations. But what kind of expansion do they learn in practice? A🧵
The body ordered expansion, equations
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COSMO Lab @labcosmo.bsky.social · 13/02/2026
Hot off the press on hashtag @aip.bsky.social #JCP, an introduction to the metatensor ecosystem. High-quality 🧑‍🚀 tools for atomistic hashtag#machinelearning - read on pubs.aip.org/aip/jcp/arti... and check it out at metatensor.org 🧑‍🍳 📖 recipes here atomistic-cookbook.org/software/met...
pubs.aip.org
metatensor and metatomic: Foundational libraries for interoperable atomistic machine learning
Incorporation of machine learning (ML) techniques into atomic-scale modeling has proven to be an extremely effective strategy to improve the accuracy and reduce
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COSMO Lab @labcosmo.bsky.social · 12/02/2026
It is a stormy day, but the COSMO retreat is going strong!
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COSMO Lab @labcosmo.bsky.social · 09/02/2026
🧑‍🚀 Filippo, Arslan and Paolo doing some PET talk with our friends at the @epfl-ai-center.bsky.social ai.epfl.ch/a-new-refere...
ai.epfl.ch
A New Reference Model for Machine-Learning–Driven Materials Discovery - EPFL AI Center
Researchers at EPFL’s Laboratory of Computational Science and Modeling (COSMO) have reached a significant milestone in material science, reaching the top position on Matbench Discovery, the leading be...
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COSMO Lab @labcosmo.bsky.social · 08/02/2026
If you want to learn about materials modeling, from DFT to MD, well marinated in a spicy ML sauce, don't miss out the @ictp.bsky.social / @nccr-marvel.bsky.social college. Details and application instructions here indico.ictp.it/event/11146/. See you in Miramare!
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COSMO Lab @labcosmo.bsky.social · 06/02/2026
PET continues its victory round of benchmarks and challenges 🥇🥉. And this one has a (bit far-fetched) end goal that would also make it useful! Congrats to Filippo and Cesare (and @marceldotsci.bsky.social who got a honorable mention and will also try further his LOREM model)🚀 dtu.dk/english/news...
dtu.dk
International AI competition aims to speed up the development of materials for the green transition
The Pioneer Center CAPeX at DTU has announced the winners of the first phase (Stage 1) an international competition in partnership with the Novo Nordisk Foundation, and the Danish Centre for AI Innovation (DCAI), on using machine learning models to predict synthesis recipes for novel nanoparticles.
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COSMO Lab @labcosmo.bsky.social · 03/02/2026
Congratulations to 🧑‍🚀 Sergey Pozdnyakov who very deservedly won the @materials-epfl.bsky.social doctoral distinction award. A good time to go check on his papers, if you haven't read them already!
Sergey collects the edmx doctoral distinction prize
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COSMO Lab @labcosmo.bsky.social · 01/02/2026
Release candidate 3 of chemiscope 1.0 is out, with class and range based highlighting of points. Try it, break it, report it on github.com/lab-cosmo/ch...
Cluster highlights in chemiscope 1.0 RC3
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COSMO Lab @labcosmo.bsky.social · 30/01/2026
Fantastic news from the @snf-fns.ch, who despite the budget cuts managed to fund six new NCCRs. Looking forward to doing some cool simulations to advance separation science! actu.epfl.ch/news/a-new-n...
actu.epfl.ch
A new national research programme recognizes EPFL's expertise
The Swiss Confederation launches six new National Centres of Competence in Research (NCCRs). The NCCR “Separations”, which aims to accelerate research in separation sciences - the quest for chemical a...
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COSMO Lab @labcosmo.bsky.social · 23/01/2026
If you got curious by the PET-OAM results a week ago, you can learn more reading up arxiv.org/abs/2601.16195. Including some general considerations on how to train and use safely an unconstrained ML potential.
Table showing results of a few representative universal model on the matbench leaderboard
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COSMO Lab @labcosmo.bsky.social · 14/01/2026
Not going to make a big deal out of a benchmark table, but PET just got the top spot on matbench-discovery.materialsproject.org. And don't be fooled by the huge parameters count, it's faster and can handle larger structures than eSEN-30M 🚀. Kudos to 🧑‍🚀 Filippo, Arslan and Paolo!
Screenshot of the matbench discovery leaderboard as of 14.01.2026, showing a PET based model in the top position
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COSMO Lab @labcosmo.bsky.social · 05/01/2026
📢 chemiscope.org 1.0.0rc1 just dropped on pypi! We are making (a few) breaking changes to the interfaces, fixing a ton of bugs and introducing some exciting features (you can finally load datasets with > 100k points!). We'd be grateful if you test, break and report 🐛 github.com/lab-cosmo/ch...
Zooming in on a large-scale dataset to showcase the new adaptive resolution features in chemiscope
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COSMO Lab @labcosmo.bsky.social · 03/01/2026
Hope y'all are getting a great start of 2026. Here we're taking some time to add the 2025 winter card to the archives www.epfl.ch/labs/cosmo/i... 🎅=🧑‍🚀
A cheeshire cat sitting on a tree overlooking a winter landscape, with snapshots of the many classes of materials that the PET-MAD universal interatomic potential can be used for
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COSMO Lab @labcosmo.bsky.social · 17/12/2025
📢 New chemiscope.org release just landed! To make it even easier to integrate ⚗️🔭 into your workflow, we added a @streamlit.bsky.social component, so you can run analyses and show you atomistic data in a web app by just writing a few lines of python! try it, break it, report it!
example of a streamlit app integrating a chemiscope viewer
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COSMO Lab @labcosmo.bsky.social · 10/12/2025
Congrats to 🧑‍🚀 Sergey Pozdnyakov who received a distinction (best 8% of theses at @materials-epfl.bsky.social) for his PhD thesis "Advancing understanding and practical performance of machine learning interatomic potentials". Поїхали 🚀! infoscience.epfl.ch/entities/pub...
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COSMO Lab @labcosmo.bsky.social · 09/12/2025
No day goes by without a new universal #ML potential. But how different they really are? Sanggyu and Sofiia tried to give a quantitative answer by comparing the reconstruction errors between their latent-space features. If you are curious, check out the #preprint arxiv.org/html/2512.05...
Features reconstruction errors between the latent spaces of several universal MLIPs
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COSMO Lab @labcosmo.bsky.social · 28/11/2025
📢 PET-MAD is here! 📢 It has been for a while for those who read the #arXiv, but now you get it preciously 💸 typeset by @natcomms.nature.com Take home: unconstrained architecture + good train set choices give you fast, accurate and stable universal MLIP that just works™️ www.nature.com/articles/s41...
nature.com
PET-MAD as a lightweight universal interatomic potential for advanced materials modeling - Nature Communications
PET-MAD is a fast and lightweight universal machine-learning potential, trained on a small but diverse dataset, that delivers near-quantum accuracy in atomistic simulations for both organic and inorga...
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COSMO Lab @labcosmo.bsky.social · 23/11/2025
📢 Let us (re)introduce to you our Massive Atomic Diversity dataset for universal MLIPs. MAD includes molecules, clusters, surfaces and plenty of bulk configs, we cover a lot of ground with fewer than 100k structures, using highly consistent DFT settings. Read more 📑 www.nature.com/articles/s41...
nature.com
Massive Atomic Diversity: a compact universal dataset for atomistic machine learning - Scientific Data
Scientific Data - Massive Atomic Diversity: a compact universal dataset for atomistic machine learning
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Reposted by COSMO Lab
AIhub.org @aihub.org · 15/10/2025
‪In this blog post, Filippo Bigi, Marcel Langer (@labcosmo.bsky.social‬) and @micheleceriotti.bsky.social write about the need to balance speed and physical laws when using ML for atomic-scale simulations aihub.org/2025/10/10/m...
aihub.org
Machine learning for atomic-scale simulations: balancing speed and physical laws - ΑΙhub
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COSMO Lab @labcosmo.bsky.social · 10/10/2025
A primer for non conservative (& rotationally unconstrained) MLIPs, and how to use them safely. Thanks @aihub.org for the space! aihub.org/2025/10/10/m...
aihub.org
Machine learning for atomic-scale simulations: balancing speed and physical laws - ΑΙhub
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Reposted by COSMO Lab
Michele Ceriotti @micheleceriotti.bsky.social · 05/10/2025
Looks like @ox.ac.uk forbids their researchers to do any kind of literature search, though it seems that thankfully they can still submit to the arxiv arxiv.org/abs/2510.00027 🤷
arxiv.org
Learning Inter-Atomic Potentials without Explicit Equivariance
Accurate and scalable machine-learned inter-atomic potentials (MLIPs) are essential for molecular simulations ranging from drug discovery to new material design. Current state-of-the-art models enforc...
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COSMO Lab @labcosmo.bsky.social · 23/09/2025
📝 We have been told (& been telling) that ML potentials are linked quite directly to the expansion of the atomic energy into pairs, triples, and so on. But is this actually true 🤔? Go read the latest from the 🧑‍🚀 team (w/QM help from Joonho's team at Harvard) to find out more arxiv.org/html/2509.14...
arxiv.org
Resolving the Body-Order Paradox of Machine Learning Interatomic Potentials
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COSMO Lab @labcosmo.bsky.social · 19/09/2025
Bragging time - ⚡ FlashMD⚡ was accepted as a spotlight paper at #NeurIPS25. if you still haven't checked it out, it's already on the #arxiv arxiv.org/abs/2505.19350, the code is at flashmd.org and the 🧑‍🍳📖 is here atomistic-cookbook.org/examples/fla.... Congrats to Filippo, Sanggyu and Augustinus!
flashmd.org
GitHub - lab-cosmo/flashmd: A universal ML model to predict molecular dynamics trajectories with long time steps
A universal ML model to predict molecular dynamics trajectories with long time steps - lab-cosmo/flashmd
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Reposted by COSMO Lab
Christoph Dellago @chhdellago.bsky.social · 10/09/2025
Michele Parrinello giving the ICTP Colloquium (he speaks about catalysis) as part of the conference celebrating his 80th birthday. Amazing creativity throughout a long career!
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Reposted by COSMO Lab
Jennie Martin @jennieemartin.bsky.social · 03/09/2025
I'm very pleased to say my first preprint, with @graemeday.bsky.social and @micheleceriotti.bsky.social is now online! This is the main work of my PhD, adapting a similarity kernel to be more suited for exploring molecular CSP landscapes #compchemsky #chemsky #compchem doi.org/10.26434/che...
doi.org
An Adapted Similarity Kernel and Generalised Convex Hull for Molecular Crystal Structure Prediction
We adapted an existing approach to identifying stabilisable crystal structures from prediction sets - the Generalised Convex Hull (GCH) - to improve its application to molecular crystal structures. Th...
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COSMO Lab @labcosmo.bsky.social · 28/08/2025
Anticipating 🧑‍🚀 Wei Bin's talk at #psik2025 (noon@roomA), 📢 a new #preprint using PET and the MAD dataset to train a universal #ml model for the density of states, giving band gaps for solids, clusters, surfaces and molecules with MAE ~200meV. Go to the talk, or check out arxiv.org/html/2508.17...!
error plots for the PET-MAD-DOS model on different datasets
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COSMO Lab @labcosmo.bsky.social · 27/08/2025
📢 Now out on @physrevx.bsky.social energy, journals.aps.org/prxenergy/ab... from 🧑‍🚀 @dtisi.bsky.social and Hanna Türk, our #PET -powered study of the dynamic reconstruction of LPS surfaces, and how it affects their structure, stability and reactivity.
A cartoon explaining how mild finite-temperature conditions induce disorder and dynamical reconstruction on the surfaces of lithium thiophosphates
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COSMO Lab @labcosmo.bsky.social · 26/08/2025
If you are at the #psik2025 and want to know more about the #metatensor ecosystem, don't miss @luthaf.bsky.social talk tomorrow morning 9:45 in room 1
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COSMO Lab @labcosmo.bsky.social · 22/08/2025
🚨 #machinelearning for #compchem goodies from our 🧑‍🚀 team incoming! After years of work it's time to share. Go check arxiv.org/abs/2508.15704 and/or metatensor.org to learn about #metatensor and #metatomic. What they are, what they do, why you should use them for all of your atomistic ML projects 🔍.
metatensor logometatomic logo
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COSMO Lab @labcosmo.bsky.social · 18/08/2025
Go metatensor.org!
A metatensor.org sticker on top of the mattehorn
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COSMO Lab @labcosmo.bsky.social · 08/08/2025
If you are excited about 30x longer time steps in molecular dynamics using FlashMD, but are worried about it not being symplectic, Filippo has something new cooking that should make you even more excited. Head to the #arxiv for a preview arxiv.org/html/2508.01...
Orbits for a periodic 3-body system, showing the stability of a ML long-time integrator
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COSMO Lab @labcosmo.bsky.social · 24/07/2025
Two new recipes landed in the #atomistic-cookbook 🧑‍🍳📖. One explaining how to fine-tune the #PET-MAD universal model on a system-specific dataset, one training a model with conservative fine tuning. Check them out on atomistic-cookbook.org/examples/pet... and atomistic-cookbook.org/examples/pet...
Training curves for "conservative fine tuning" a PET model
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Reposted by COSMO Lab
Barak Hirshberg @barakhirshberg.bsky.social · 08/07/2025
Very few things make me prouder than having Jacob and @yotamfe.bsky.social's paper published today in JCP in the special issue honoring one of my personal heroes, Abraham Nitzan. Abe is a giant of theoretical chemistry (in Israel and globally) and an inspiration to us all. doi.org/10.1063/5.02...
doi.org
Periodic boundary conditions for bosonic path integral molecular dynamics
We develop an algorithm for bosonic path integral molecular dynamics (PIMD) simulations with periodic boundary conditions (PBC) that scales quadratically with t
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COSMO Lab @labcosmo.bsky.social · 07/07/2025
New 🧑‍🍳📖 #recipe landed, doubling up as a @plumed.org tutorial 🐦 atomistic-cookbook.org/examples/met..., and explaining how to use the #metatomic interface in #plumed to define custom collective variables with all the flexibility and speed of torch.
snapshot of a trajectory of a Ar38 cluster undergoing a transition from the fcc to the icosahedral minima
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COSMO Lab @labcosmo.bsky.social · 26/06/2025
Diverse data is good data! Took a while to polish it, but we have finally released the small-but-smart MAD dataset we used to train PET-MAD. You can find more on the #preprint arxiv.org/html/2506.19... or just head to the #materialscloud to fetch MAD archive.materialscloud.org/records/xdsb...
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COSMO Lab @labcosmo.bsky.social · 20/06/2025
Very proud to send Filippo Bigi to Vancouver to give an oral presentation at @icmlconf.bsky.social about our investigation of the use of "dark-side forces" in atomistic simulations. The final version is here openreview.net/forum?id=OEl... and it's worth a read even if you already read the #preprint
openreview.net
The dark side of the forces: assessing non-conservative force...
The use of machine learning to estimate the energy of a group of atoms, and the forces that drive them to more stable configurations, have revolutionized the fields of computational chemistry and...
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COSMO Lab @labcosmo.bsky.social · 17/06/2025
🎉 DFT-accurate, with built-in uncertainty quantification, providing chemical shielding anisotropy - ShiftML3.0 has it all! Building on a successful @nccr-marvel.bsky.social-funded collaboration with LRM🧲⚛️, it just landed on the arXiv arxiv.org/html/2506.13... and on pypi pypi.org/project/shif...
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Reposted by COSMO Lab
Materials Science & Engineering @EPFL @materials-epfl.bsky.social · 17/06/2025
🏆 Congratulations to Prof Francesco Stellacci from Materials Science and Engineering at EPFL for receiving an ERC Advanced Grant for his project Engineering Protein Interactions Using Small Molecules Find out more: actu.epfl.ch/news/epfl-re...
actu.epfl.ch
EPFL research is back on the European stage
Eight EPFL researchers have been selected by the European Research Council (ERC) as part of the 2024 call for proposals for the Advanced Grant competition, including four in the School of Engineering.
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COSMO Lab @labcosmo.bsky.social · 13/06/2025
#metatensor day about to start! Join us on zoom if you're not at #EPFL epfl.zoom.us/j/68368776745 @nccr-marvel.bsky.social
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