# Latest **URL:** https://forum.kavli.tudelft.nl/latest.md [Latest](https://forum.kavli.tudelft.nl/latest.md) · [Categories](https://forum.kavli.tudelft.nl/categories.md) --- ## [Introduce yourself!](https://forum.kavli.tudelft.nl/t/introduce-yourself/12)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 10\ **Last updated:** [25 November 2020 11:59 UTC](https://forum.kavli.tudelft.nl/t/introduce-yourself/12 "2020-11-25T11:59:20Z")
Hello world! I hope that this forum will turn into a useful tool and will help many of us in research and daily work. But now, let’s get this discussion going: say a few words about yourself! --- ## [Welcome to the Kavli discussion forum!](https://forum.kavli.tudelft.nl/t/welcome-to-the-kavli-discussion-forum/7)
**Author:** [@system](https://forum.kavli.tudelft.nl/u/system)\ **Replies:** 0\ **Last updated:** [8 May 2020 10:22 UTC](https://forum.kavli.tudelft.nl/t/welcome-to-the-kavli-discussion-forum/7 "2020-05-08T10:22:38Z")
This is a public place for all the Kavli institute members to ask and answer questions, get and provide help on various issues. You can ask about: Programming & software (including the hpc05 cluster) Hardware, clean r… --- ## [Job stopped, not sure why](https://forum.kavli.tudelft.nl/t/job-stopped-not-sure-why/403)
**Author:** [@hsharma](https://forum.kavli.tudelft.nl/u/hsharma)\ **Replies:** 5\ **Last updated:** [29 July 2024 12:52 UTC](https://forum.kavli.tudelft.nl/t/job-stopped-not-sure-why/403 "2024-07-29T12:52:19Z")
Hi, I am new to the cluster, and i received the following error while running a file: /var/opt/ud/torque-4.2.10/mom\_priv/jobs/1690376.hpc05.hpc.SC: line 14: 32107 Killed. Could someone explain the reason why the file w… --- ## [Long queuing times](https://forum.kavli.tudelft.nl/t/long-queuing-times/383)
**Author:** [@Luise](https://forum.kavli.tudelft.nl/u/Luise)\ **Replies:** 5\ **Last updated:** [2 November 2023 21:22 UTC](https://forum.kavli.tudelft.nl/t/long-queuing-times/383 "2023-11-02T21:22:23Z")
Hi :wave: recently the queuing time is much longer than usual. My jobs have been waiting for 3 hours even though the monitoring page suggests that almost all cores (872) are free? A colleague of mine is facing the same… --- ## [Lock-in measurement: common issues and guidelines](https://forum.kavli.tudelft.nl/t/lock-in-measurement-common-issues-and-guidelines/85)
**Author:** [@guanzhongwang](https://forum.kavli.tudelft.nl/u/guanzhongwang)\ **Replies:** 10\ **Last updated:** [16 October 2023 09:34 UTC](https://forum.kavli.tudelft.nl/t/lock-in-measurement-common-issues-and-guidelines/85 "2023-10-16T09:34:58Z")
Hi all, A few of us here at the topo group in QuTech recently spent some time hunting down systematic errors introduced into electrical transport measurements by lock-in amplifiers. Since we noticed improper use of lock… --- ## [Starting with the cluster and Python/Jupyter](https://forum.kavli.tudelft.nl/t/starting-with-the-cluster-and-python-jupyter/139)
**Author:** [@mkounalakis](https://forum.kavli.tudelft.nl/u/mkounalakis)\ **Replies:** 14\ **Last updated:** [12 July 2023 15:43 UTC](https://forum.kavli.tudelft.nl/t/starting-with-the-cluster-and-python-jupyter/139 "2023-07-12T15:43:36Z")
Hi everyone, I would like to start using the cluster for python / ipython notebook simulations, however my understanding is that some things need to be set up first (I have no experience using a cluster before). I have… --- ## [Python version control](https://forum.kavli.tudelft.nl/t/python-version-control/370)
**Author:** [@Luise](https://forum.kavli.tudelft.nl/u/Luise)\ **Replies:** 4\ **Last updated:** [11 July 2023 20:48 UTC](https://forum.kavli.tudelft.nl/t/python-version-control/370 "2023-07-11T20:48:12Z")
Hi :wave: in the wiki I read about the provided venv package control, however, is it also possible to use pyenv or some other tool to specify local, project-specific python versions (python 3.8 in my project’s case)? Th… --- ## [Parallelising a qutip for loop over the cluster](https://forum.kavli.tudelft.nl/t/parallelising-a-qutip-for-loop-over-the-cluster/364)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 2\ **Last updated:** [28 June 2023 13:46 UTC](https://forum.kavli.tudelft.nl/t/parallelising-a-qutip-for-loop-over-the-cluster/364 "2023-06-28T13:46:00Z")
Hi all, We have been running some code that basically runs QuTiP’s steadystate() for different input parameters. Because of a need for an increased Hilbert space size, each of these is now taking 4 hours on our laptop c… --- ## [Cluster maintenance weekend](https://forum.kavli.tudelft.nl/t/cluster-maintenance-weekend/177)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 0\ **Last updated:** [8 December 2022 11:43 UTC](https://forum.kavli.tudelft.nl/t/cluster-maintenance-weekend/177 "2022-12-08T11:43:19Z")
Hi cluster users! Dec 17–18 there will be a maintenance weekend, where all the cluster nodes will be restarted to receive the latest updates. Please plan accordingly and don’t run important calculations that should not … --- ## [Problems with tensorflow/keras/hyperas within the cluster](https://forum.kavli.tudelft.nl/t/problems-with-tensorflow-keras-hyperas-within-the-cluster/175)
**Author:** [@vgualtieri](https://forum.kavli.tudelft.nl/u/vgualtieri)\ **Replies:** 8\ **Last updated:** [1 August 2022 12:55 UTC](https://forum.kavli.tudelft.nl/t/problems-with-tensorflow-keras-hyperas-within-the-cluster/175 "2022-08-01T12:55:15Z")
Hi everyone, I have been trying for more than a week now to set up a conda virtual environmnet to run my code. Unfortunately, I keep running in errors due to incompatibilities between TensorFlow packages and Keras packa… --- ## [Cluster restart Nov 2](https://forum.kavli.tudelft.nl/t/cluster-restart-nov-2/170)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 0\ **Last updated:** [28 October 2021 16:10 UTC](https://forum.kavli.tudelft.nl/t/cluster-restart-nov-2/170 "2021-10-28T16:10:10Z")
Dear cluster users, Due to an OS update the cluster will be restarted morning Nov 2, please plan your computations accordingly. --- ## [Security policy!](https://forum.kavli.tudelft.nl/t/security-policy/169)
**Author:** [@jost](https://forum.kavli.tudelft.nl/u/jost)\ **Replies:** 0\ **Last updated:** [19 October 2021 12:34 UTC](https://forum.kavli.tudelft.nl/t/security-policy/169 "2021-10-19T12:34:43Z")
I received the following message, which is relevant to users logging in from outside the TU: In accordance with our security policy the hpc clusters and servers will be placed behind a firewall. This means that a direct… --- ## [Publons and ORCID ID](https://forum.kavli.tudelft.nl/t/publons-and-orcid-id/166)
**Author:** [@AlvaroGI](https://forum.kavli.tudelft.nl/u/AlvaroGI)\ **Replies:** 2\ **Last updated:** [18 May 2021 10:29 UTC](https://forum.kavli.tudelft.nl/t/publons-and-orcid-id/166 "2021-05-18T10:29:49Z")
Hi everyone, I recently did my first peer review for a journal (I am a first year PhD student) and, when submitting my review, I was asked: if I wanted to get recognition for the review on Publons, and if I wanted to … --- ## [How to tell the difference between cores used and cores reserved](https://forum.kavli.tudelft.nl/t/how-to-tell-the-difference-between-cores-used-and-cores-reserved/163)
**Author:** [@mdepken](https://forum.kavli.tudelft.nl/u/mdepken)\ **Replies:** 3\ **Last updated:** [29 April 2021 09:40 UTC](https://forum.kavli.tudelft.nl/t/how-to-tell-the-difference-between-cores-used-and-cores-reserved/163 "2021-04-29T09:40:22Z")
Hi All, We (depken group BN) have had a few instances where it turns out we are using many more cores than what we reserved and thought we were using. We think we have fixed the problem, but is there an easy way to fin… --- ## ["saving" / "loading" object data in python](https://forum.kavli.tudelft.nl/t/saving-loading-object-data-in-python/161)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 9\ **Last updated:** [5 April 2021 09:02 UTC](https://forum.kavli.tudelft.nl/t/saving-loading-object-data-in-python/161 "2021-04-05T09:02:49Z")
Hi all, I’d like to be able to “save the settings” of an object and reload them later. The attributes I want to save/load are small and pretty simple data formats (nothing fancy: int, float, dict, strings, lists of tho… --- ## ["linking" widgets to class attributes and class attributes to actions](https://forum.kavli.tudelft.nl/t/linking-widgets-to-class-attributes-and-class-attributes-to-actions/160)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 2\ **Last updated:** [31 March 2021 14:03 UTC](https://forum.kavli.tudelft.nl/t/linking-widgets-to-class-attributes-and-class-attributes-to-actions/160 "2021-03-31T14:03:25Z")
Hi all, A bit related to my previous question Python question: “observer pattern” actions for dictionary?: I would like to build an interaction of a class with an ipywidget. Currently, I do this with a painful piece of… --- ## ["Scripting" vs. "Programming" in python, and the relation to Jupyter Notebooks](https://forum.kavli.tudelft.nl/t/scripting-vs-programming-in-python-and-the-relation-to-jupyter-notebooks/131)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 2\ **Last updated:** [17 March 2021 11:16 UTC](https://forum.kavli.tudelft.nl/t/scripting-vs-programming-in-python-and-the-relation-to-jupyter-notebooks/131 "2021-03-17T11:16:11Z")
Hi all, I’ve been teaching now for several years with Jupyter notebooks, and also using them myself. In my efforts to convince more people to use notebooks, I have encountered a lot of confusion about when / how to u… --- ## [How do you calculate your charge stability diagrams?](https://forum.kavli.tudelft.nl/t/how-do-you-calculate-your-charge-stability-diagrams/159)
**Author:** [@eliska](https://forum.kavli.tudelft.nl/u/eliska)\ **Replies:** 4\ **Last updated:** [15 March 2021 11:15 UTC](https://forum.kavli.tudelft.nl/t/how-do-you-calculate-your-charge-stability-diagrams/159 "2021-03-15T11:15:28Z")
I have a question for quantum dot people: I realized there is a discrepancy in the QD community on how to evaluate a current derivative for charge stability diagrams. When I calculate this derivative, say my axes are vo… --- ## [Contribution Statements as a figure](https://forum.kavli.tudelft.nl/t/contribution-statements-as-a-figure/156)
**Author:** [@nemoandrea](https://forum.kavli.tudelft.nl/u/nemoandrea)\ **Replies:** 3\ **Last updated:** [9 March 2021 14:40 UTC](https://forum.kavli.tudelft.nl/t/contribution-statements-as-a-figure/156 "2021-03-09T14:40:25Z")
Hello All, I have been working on a little hobby project inspired by the following tweet: by Nick Steinmetz (@SteinmetzNeuro) I figured it would be interesting to see if this could actually be practical. So I decided t… --- ## [Python question: "observer pattern" actions for dictionary?](https://forum.kavli.tudelft.nl/t/python-question-observer-pattern-actions-for-dictionary/149)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 7\ **Last updated:** [19 February 2021 21:21 UTC](https://forum.kavli.tudelft.nl/t/python-question-observer-pattern-actions-for-dictionary/149 "2021-02-19T21:21:32Z")
Hi all, I’m learning to write classes in python and am trying to understand better default actions: In particular, I’m working on a class for set of instruments. It turns out that this class of instruments has a help… --- ## [Best way to compile c++ code for the cluster?](https://forum.kavli.tudelft.nl/t/best-way-to-compile-c-code-for-the-cluster/153)
**Author:** [@rlos1](https://forum.kavli.tudelft.nl/u/rlos1)\ **Replies:** 3\ **Last updated:** [17 February 2021 15:23 UTC](https://forum.kavli.tudelft.nl/t/best-way-to-compile-c-code-for-the-cluster/153 "2021-02-17T15:23:15Z")
Hi everyone, I’m currently trying to get a piece of c++ code from my Macbook to run on the cluster, which means I have to compile it for linux first. However, there seem to be lots of ways to go about that and I’m not f… --- ## [Bug on building the example from Jupyter Book](https://forum.kavli.tudelft.nl/t/bug-on-building-the-example-from-jupyter-book/69)
**Author:** [@Leila](https://forum.kavli.tudelft.nl/u/Leila)\ **Replies:** 20\ **Last updated:** [27 January 2021 13:40 UTC](https://forum.kavli.tudelft.nl/t/bug-on-building-the-example-from-jupyter-book/69 "2021-01-27T13:40:59Z")
Hi all, I was trying to test Jupyter Books to convert my notebooks and my .md files into a nice readable piece, but I am failing on installing it, and so far I havent found why. I am following the steps provided in htt… --- ## [Cluster shutdown February 4th](https://forum.kavli.tudelft.nl/t/cluster-shutdown-february-4th/148)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 0\ **Last updated:** [24 January 2021 16:33 UTC](https://forum.kavli.tudelft.nl/t/cluster-shutdown-february-4th/148 "2021-01-24T16:33:16Z")
Hi all, Just got a note from TUD ICT that the hpc05 cluster will be shut down due to migration for the whole day of February 4. Please plan your simulations accordingly and let your colleagues know if they aren’t on thi… --- ## [Saving cluster data on your own desktop](https://forum.kavli.tudelft.nl/t/saving-cluster-data-on-your-own-desktop/147)
**Author:** [@Emma](https://forum.kavli.tudelft.nl/u/Emma)\ **Replies:** 1\ **Last updated:** [12 January 2021 21:20 UTC](https://forum.kavli.tudelft.nl/t/saving-cluster-data-on-your-own-desktop/147 "2021-01-12T21:20:03Z")
Hi there, I am using the cluster for the first time now, and I would like to save the data on from the cluster to my own computer. I know there should be a command that synchronizes the cluster folder with a folder on m… --- ## [TU Delft COMSOL licence?](https://forum.kavli.tudelft.nl/t/tu-delft-comsol-licence/145)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 2\ **Last updated:** [29 December 2020 20:45 UTC](https://forum.kavli.tudelft.nl/t/tu-delft-comsol-licence/145 "2020-12-29T20:45:04Z")
Hi all, I’m trying to learn to use COMSOL (never too old to learn!) but have run into a curious problem: to create any kind of model (to even use the “create rectangle” button!) I need to have access to the DESIGN modul… --- ## [Using PuTTY and MobaXTerm](https://forum.kavli.tudelft.nl/t/using-putty-and-mobaxterm/137)
**Author:** [@milan\_lacassin](https://forum.kavli.tudelft.nl/u/milan_lacassin)\ **Replies:** 3\ **Last updated:** [11 November 2020 12:45 UTC](https://forum.kavli.tudelft.nl/t/using-putty-and-mobaxterm/137 "2020-11-11T12:45:44Z")
Hi, I’m Milan, BN PhD student. I’ve been now using the hpc05 cluster for a while. However, when connecting from home using PuTTY or MobaXterm, my connection expires after very short inactivity (a minute or so) which is … --- ## [Hpc05 do's and dont's](https://forum.kavli.tudelft.nl/t/hpc05-dos-and-donts/33)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 4\ **Last updated:** [11 May 2020 19:50 UTC](https://forum.kavli.tudelft.nl/t/hpc05-dos-and-donts/33 "2020-05-11T19:50:38Z")
Let’s collect best practices for using the cluster: it’s a shared resource, and its proper use requires coordination between users (the alternative—implementing strict usage limits—would be inefficient). This post is a … --- ## [Interesting article: who pays to maintain open source software?](https://forum.kavli.tudelft.nl/t/interesting-article-who-pays-to-maintain-open-source-software/135)
**Author:** [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)\ **Replies:** 3\ **Last updated:** [29 October 2020 19:38 UTC](https://forum.kavli.tudelft.nl/t/interesting-article-who-pays-to-maintain-open-source-software/135 "2020-10-29T19:38:37Z")
I thought it was interesting: https://onezero.medium.com/the-internet-relies-on-people-working-for-free-a79104a68bcc --- ## [Casimir Programming course](https://forum.kavli.tudelft.nl/t/casimir-programming-course/133)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 4\ **Last updated:** [8 October 2020 16:14 UTC](https://forum.kavli.tudelft.nl/t/casimir-programming-course/133 "2020-10-08T16:14:07Z")
tl;dr: we’re planning the quarantine version of Casimir programming course, and we need your help in planning and running it. UPDATE: The course will take place online second half of January. Sign up here! About the co… --- ## [You are invited to give a talk!](https://forum.kavli.tudelft.nl/t/you-are-invited-to-give-a-talk/134)
**Author:** [@anton-akhmerov](https://forum.kavli.tudelft.nl/u/anton-akhmerov)\ **Replies:** 0\ **Last updated:** [30 September 2020 09:30 UTC](https://forum.kavli.tudelft.nl/t/you-are-invited-to-give-a-talk/134 "2020-09-30T09:30:10Z")
tl;dr we launched a seminar series where you can present your research any time, and I invite you check it out and apply here. Online seminars now Thanks to the lockdown, in the past months we learned that onine talk… [Next page](https://forum.kavli.tudelft.nl/latest.md?page=1)