HSF Weekly Meeting #201, 4 February 2021

Present: Graeme Stewart, Serhan Mete, Attila Krasznahorkay, Michel Jouvin, Ben Morgan, Eduardo Rodrigues, Dorothea Vom Bruch, Chris Jones, Kevin Pedro, Efe Yazgan, Mason Proffitt, Andrei Gheata, Paul Laycock, Daniel Elvira, TJ Khoo, Sudhir Malik, Krzysztof Genser, Stefan Roiser, Kyle Knoepfel, Antoine Pérus, Benedikt Hegner, Liz Sexton-Kennedy, Mircho Rozodov, Philippe Canal, Daniel Elvira, Andrea Valassi (late), Meirin Oan Evans (late)

Apologies: Josh McFayden, Marc Paterno

News, general matters, announcements

WG Plans and Last Meeting’s Minutes

At the last meeting we reviewed WG plans for the early part of 2021 in particular. (Note that a TOC was added, so that direct links to individual WG notes are easier.)

We want to now more widely announce these to the community, to different experiments. This is both to raise the profile of HSF activities and to solicit feedback, particularly from non-LHC experiments.

Should we just refer to these minutes or prepare another page as a 2021 Plan of Work?

Google Summer of Code

Remember to submit your project ideas by 15 February. Avoid submitting the last minute, there is a review process for the PRs! Also check the instructions for changes to the projects this year. Few points to keep in mind:

November Workshop Survey and Outcomes

The outcomes and follow-up document was finalised - please have a look for items to not forget about in 2021. (There is still the commentable version if anything was omitted.)

The post-workshop survey was digested. 55 people responded for the HSF sessions (about 20%?). Overall the results seem quite positive (e.g., we improved the number of students attending). Proposal is to look more in depth in a future coordination meeting.

Working Group Updates

Data Analysis

(Repeated post-meeting addendum to previous minutes)

Ongoing series of metadata discussions seems like a workable format to repeat on other topics. Some themes that could follow:

Besides these, we discussed commonalities with Training WG. One Q: how much should HSF branch into (experiment-agnostic) analysis tutorials?

Detector Simulation

Reconstruction and Software Triggers


The topical meetings (Indico) of the kind “Python Module of the Month” started yesterday with a tutorial on Numba.

Next topical meeting on March 3rd (every first Wednesday of the month).

Not clear how many people followed-along live, launching and using the notebook at the same time as the speaker?

Software Tools and Packaging

We have two interesting talks lined up:

We’re planning to have a packaging oriented meeting soon. We’ll get in touch w/ Bob Dröge, who gave a nice talk (link) on EESSI (European Environment for Scientific Software Installations) at the CVMFS workshop, to present. The date/time TBD.

Homework : Follow-up on the Eigen discussion we had prior to the Christmas break (agenda for the original meeting).

Software Training

  1. GitHub Actions CI/CD training 16-19th Feb. Mentors and participants still welcome! https://indico.cern.ch/event/1001128
  2. Please drop into our weekly training meeting 16h CET Mondays to kick-start a training activity.

Event Generators

Q. When will the next WG meetings be? A. Not yet decided, but this year…


First meeting of 2021 next week, discussing CMS’s experience with upgrading to the latest UI of TBB. https://indico.cern.ch/event/1005030/.

We plan to start “free-form-discussion” meetings once a month, to allow for an easier exchange of information. We will see how that goes…

Other Interest and Activity Areas

Differentiable Computing

Group is planning a second “campfire” meeting, Friday 12 Feb at 17h: https://indico.cern.ch/event/1005490/.


Graeme was in discussion with the Faser collaboration and advised them how to copyright and license their code. The usual formula of (C) CERN and license Apache 2 was advised and will be proposed to their CB.


Meetings next week:

IRIS-HEP Feedback

We have been asked to give another round of feedback to IRIS-HEP at their next steering board meeting on 16 February. Can you think about feedback (the good, the bad, the ugly) to send via Graeme?

For reference, the feedback given last year is here: https://indico.cern.ch/event/809181/.


A few recent updates:


Registration has opened.

Next Meeting(s)