# Latest **URL:** https://swan-community.web.cern.ch/latest.md [Latest](https://swan-community.web.cern.ch/latest.md) · [Categories](https://swan-community.web.cern.ch/categories.md) --- ## [Welcome to Swan Community](https://swan-community.web.cern.ch/t/welcome-to-swan-community/8)
**Author:** [@system](https://swan-community.web.cern.ch/u/system)\ **Replies:** 0\ **Last updated:** [January 18, 2019, 10:27am UTC](https://swan-community.web.cern.ch/t/welcome-to-swan-community/8 "2019-01-18T10:27:28Z")
This forum is for bringing together users, collaborators and developers around the world. Here, they will be able to exchange ideas, tips and to help each other in an easy and user-friendly way. If you want to know mor… --- ## [Xilinx tools available?](https://swan-community.web.cern.ch/t/xilinx-tools-available/882)
**Author:** [@damazio](https://swan-community.web.cern.ch/u/damazio)\ **Replies:** 0\ **Last updated:** [July 31, 2026, 12:31pm UTC](https://swan-community.web.cern.ch/t/xilinx-tools-available/882 "2026-07-31T12:31:17Z")
Hello, Has anyone ever tried to run with Vitis in swan? We do not need an FPGA, but we would like to simulate and FPGA firmware to test different configuration in a shear able mode… Best Denis --- ## [Streamlit](https://swan-community.web.cern.ch/t/streamlit/881)
**Author:** [@dmetin](https://swan-community.web.cern.ch/u/dmetin)\ **Replies:** 0\ **Last updated:** [July 22, 2026, 12:42pm UTC](https://swan-community.web.cern.ch/t/streamlit/881 "2026-07-22T12:42:09Z")
Hello, I’m writing to ask about the possibility of setting up Streamlit in SWAN. Streamlit would allow users to: Develop dashboards quickly using Python reducing the need for repetitive scripting Share robust dashboa… --- ## [Running athena in swan? ATLAS software/Swan](https://swan-community.web.cern.ch/t/running-athena-in-swan-atlas-software-swan/879)
**Author:** [@damazio](https://swan-community.web.cern.ch/u/damazio)\ **Replies:** 7\ **Last updated:** [July 4, 2026, 8:49am UTC](https://swan-community.web.cern.ch/t/running-athena-in-swan-atlas-software-swan/879 "2026-07-04T08:49:53Z")
Hello, I am trying to make a simple example of running the atlas software framework athena. There are many things not working, but, as a start, I have the impression that part of the problem is a mismatch between the r… --- ## [Sqlite3 library on swan missing sqlite3\_deserialize symbol](https://swan-community.web.cern.ch/t/sqlite3-library-on-swan-missing-sqlite3-deserialize-symbol/878)
**Author:** [@will](https://swan-community.web.cern.ch/u/will)\ **Replies:** 0\ **Last updated:** [June 10, 2026, 3:29pm UTC](https://swan-community.web.cern.ch/t/sqlite3-library-on-swan-missing-sqlite3-deserialize-symbol/878 "2026-06-10T15:29:00Z")
Hello, A software stack I have been using on SWAN has recently stopped working for me. I’ve traced the issue to the software stack now being built against a version of sqlite3 library that includes sqlite3\_deserialize s… --- ## [Cannot access SWAN Jupyter notebooks](https://swan-community.web.cern.ch/t/cannot-access-swan-jupyter-notebooks/877)
**Author:** [@ekhazaie](https://swan-community.web.cern.ch/u/ekhazaie)\ **Replies:** 0\ **Last updated:** [May 27, 2026, 6:13pm UTC](https://swan-community.web.cern.ch/t/cannot-access-swan-jupyter-notebooks/877 "2026-05-27T18:13:38Z")
Dear SWAN team, I can access SWAN (https://swan.cern.ch), but I am unable to open my Jupyter SWAN sessions/workspace (https://swan-k8s.cern.ch). My analysis notebooks are stored there, and I currently cannot connect to … --- ## [Server error: Unhandled error](https://swan-community.web.cern.ch/t/server-error-unhandled-error/874)
**Author:** [@asbrooks](https://swan-community.web.cern.ch/u/asbrooks)\ **Replies:** 0\ **Last updated:** [May 11, 2026, 11:55am UTC](https://swan-community.web.cern.ch/t/server-error-unhandled-error/874 "2026-05-11T11:55:35Z")
Hello, I am trying to get access to a shared swan file but I get the following error \`\`Server error: Unhandled error. Do you have any solutions on how to get around this problem? Thank you in advance for the help -… --- ## [XRootD \[3011\] No servers have read access error in SWAN (Coffea + DaskExecutor with HTCondor)](https://swan-community.web.cern.ch/t/xrootd-3011-no-servers-have-read-access-error-in-swan-coffea-daskexecutor-with-htcondor/873)
**Author:** [@sasahoo](https://swan-community.web.cern.ch/u/sasahoo)\ **Replies:** 0\ **Last updated:** [April 21, 2026, 6:47am UTC](https://swan-community.web.cern.ch/t/xrootd-3011-no-servers-have-read-access-error-in-swan-coffea-daskexecutor-with-htcondor/873 "2026-04-21T06:47:12Z")
Hi, I am running a Coffea-based analysis on CERN SWAN (JupyterLab) using Dask + HTCondor workers, and I’m encountering persistent XRootD access issues. Setup Platform: CERN SWAN Executor: coffea.processor.DaskExe… --- ## [Cannot open swan notebooks](https://swan-community.web.cern.ch/t/cannot-open-swan-notebooks/469)
**Author:** [@vekirseb](https://swan-community.web.cern.ch/u/vekirseb)\ **Replies:** 5\ **Last updated:** [January 25, 2026, 12:01pm UTC](https://swan-community.web.cern.ch/t/cannot-open-swan-notebooks/469 "2026-01-25T12:01:28Z")
Hi, This morning I am not able to log in to Swan (from here: The Swan Service | SWAN). I tried to do this several times from Safari and Firefox browsers. I get the message “An internal server error has occurred”. Is … --- ## [Can't get Dask to work with Bleeding Edge](https://swan-community.web.cern.ch/t/cant-get-dask-to-work-with-bleeding-edge/861)
**Author:** [@staider](https://swan-community.web.cern.ch/u/staider)\ **Replies:** 3\ **Last updated:** [September 22, 2025, 1:08pm UTC](https://swan-community.web.cern.ch/t/cant-get-dask-to-work-with-bleeding-edge/861 "2025-09-22T13:08:03Z")
Hello SWAN team, I’m trying to start a Dask cluster on the HTCondor pool using the “Bleeding Edge” software stack, and it’ won’t start: when I click on “new” I get this “Cluster Start Error” that says “Unhandled error”. … --- ## [Open xAOD file in SWAN](https://swan-community.web.cern.ch/t/open-xaod-file-in-swan/863)
**Author:** [@gtarna](https://swan-community.web.cern.ch/u/gtarna)\ **Replies:** 3\ **Last updated:** [September 9, 2025, 7:48pm UTC](https://swan-community.web.cern.ch/t/open-xaod-file-in-swan/863 "2025-09-09T19:48:27Z")
Hello, Does anyone know if it’s possible to open xAOD files in SWAN? Thanks --- ## [HTCondor and coffea](https://swan-community.web.cern.ch/t/htcondor-and-coffea/858)
**Author:** [@amgogia](https://swan-community.web.cern.ch/u/amgogia)\ **Replies:** 6\ **Last updated:** [August 25, 2025, 5:13am UTC](https://swan-community.web.cern.ch/t/htcondor-and-coffea/858 "2025-08-25T05:13:22Z")
Hello! I’m a newbie to SWAN, and I’m also new to coffee and HTCondor. I’m trying to analyze some Run3 files on the cluster using a CMS analysis (event selection). I’m curious if there are any great resources out there t… --- ## [Syntax Highlighting and Intellisense](https://swan-community.web.cern.ch/t/syntax-highlighting-and-intellisense/856)
**Author:** [@hramm](https://swan-community.web.cern.ch/u/hramm)\ **Replies:** 3\ **Last updated:** [August 25, 2025, 4:53am UTC](https://swan-community.web.cern.ch/t/syntax-highlighting-and-intellisense/856 "2025-08-25T04:53:10Z")
Hey all! :smiley: Using SWAN so that I don’t hit my memory ceiling in Jupyter as quickly as I do on my local device. However, I’m really missing the syntax highlighting/autocomplete/intellisense from my local VSCode env… --- ## [Swan 503 Service Temporarily Unavailable](https://swan-community.web.cern.ch/t/swan-503-service-temporarily-unavailable/855)
**Author:** [@elos](https://swan-community.web.cern.ch/u/elos)\ **Replies:** 0\ **Last updated:** [August 17, 2025, 1:26pm UTC](https://swan-community.web.cern.ch/t/swan-503-service-temporarily-unavailable/855 "2025-08-17T13:26:47Z")
I’ve been using SWAN without issues for a couple of months but today it no longer loads: I get the error 503 Service Temporarily Unavailable. --- ## [SWAN session not starting](https://swan-community.web.cern.ch/t/swan-session-not-starting/849)
**Author:** [@tmenezes](https://swan-community.web.cern.ch/u/tmenezes)\ **Replies:** 1\ **Last updated:** [June 17, 2025, 2:07pm UTC](https://swan-community.web.cern.ch/t/swan-session-not-starting/849 "2025-06-17T14:07:24Z")
Dear experts, When trying to create a new SWAN session, with Software Stack 104a and Cent0S7 platform, the session could not be started (Firefox and Google Chrome). I wonder if this problem happened for someone else a… --- ## [Connection to kernel failed](https://swan-community.web.cern.ch/t/connection-to-kernel-failed/845)
**Author:** [@pagej](https://swan-community.web.cern.ch/u/pagej)\ **Replies:** 0\ **Last updated:** [June 5, 2025, 9:21am UTC](https://swan-community.web.cern.ch/t/connection-to-kernel-failed/845 "2025-06-05T09:21:29Z")
Dear SWAN team, over the past few weeks I have been having connectivity issues while using SWAN. When I run a cell, my notebook inevitably loses connection to the notebook server and the following error message is disp… --- ## [XRootD Authentication Issues When Using HTCondor Cluster](https://swan-community.web.cern.ch/t/xrootd-authentication-issues-when-using-htcondor-cluster/842)
**Author:** [@msahraei](https://swan-community.web.cern.ch/u/msahraei)\ **Replies:** 4\ **Last updated:** [May 27, 2025, 2:18pm UTC](https://swan-community.web.cern.ch/t/xrootd-authentication-issues-when-using-htcondor-cluster/842 "2025-05-27T14:18:14Z")
Dear Experts, I am currently using pocket-coffea and coffea 7.25.0 on the software stack 107 for my analysis. When running locally without the HTCondor cluster, everything works correctly - I can access remote files usi… --- ## [Tensorboard access](https://swan-community.web.cern.ch/t/tensorboard-access/441)
**Author:** [@alobanov](https://swan-community.web.cern.ch/u/alobanov)\ **Replies:** 12\ **Last updated:** [May 2, 2025, 11:54am UTC](https://swan-community.web.cern.ch/t/tensorboard-access/441 "2025-05-02T11:54:37Z")
Tensorflow offers a nice visualisation tool for the model parameters: TensorBoard | TensorFlow It can be launched directly from a notebook (or from the CLI), but then one needs to access it on another port. Is there a… --- ## [IOPub data rate exceeded](https://swan-community.web.cern.ch/t/iopub-data-rate-exceeded/837)
**Author:** [@asbrooks](https://swan-community.web.cern.ch/u/asbrooks)\ **Replies:** 2\ **Last updated:** [April 17, 2025, 1:01pm UTC](https://swan-community.web.cern.ch/t/iopub-data-rate-exceeded/837 "2025-04-17T13:01:41Z")
Hello, How can I increase the data rate. I have tried generate a config file jupyter notebook --generate-config Then increased the limit from this # Default: 1000000 c.NotebookApp.iopub\_data\_rate\_limit = 10000000 … --- ## [Error creating proxy certificate: No route to host](https://swan-community.web.cern.ch/t/error-creating-proxy-certificate-no-route-to-host/835)
**Author:** [@vsedighz](https://swan-community.web.cern.ch/u/vsedighz)\ **Replies:** 4\ **Last updated:** [April 15, 2025, 9:37am UTC](https://swan-community.web.cern.ch/t/error-creating-proxy-certificate-no-route-to-host/835 "2025-04-15T09:37:56Z")
Hello all, I’m encountering an issue when trying to create a proxy on SWAN terminal. The VOMS server is contacted successfully, but the proxy creation fails with a “No route to host” error. Here’s the command and outpu… --- ## [Accessing swan software stack from lxplus](https://swan-community.web.cern.ch/t/accessing-swan-software-stack-from-lxplus/832)
**Author:** [@hahamdao](https://swan-community.web.cern.ch/u/hahamdao)\ **Replies:** 3\ **Last updated:** [March 28, 2025, 4:11pm UTC](https://swan-community.web.cern.ch/t/accessing-swan-software-stack-from-lxplus/832 "2025-03-28T16:11:09Z")
I know someone have asked about offering better IDE like VSCode on the web as a complement to SWAN. But my question is there a way to just specify one of SWAN software stacks like python2 or cuda as kernel or a jupyter s… --- ## [What happened to the memory usage tracker in the top?](https://swan-community.web.cern.ch/t/what-happened-to-the-memory-usage-tracker-in-the-top/829)
**Author:** [@lgolino](https://swan-community.web.cern.ch/u/lgolino)\ **Replies:** 6\ **Last updated:** [March 19, 2025, 1:36pm UTC](https://swan-community.web.cern.ch/t/what-happened-to-the-memory-usage-tracker-in-the-top/829 "2025-03-19T13:36:24Z")
The notebooks used to track the memory usage of the kernel. This was useful when working with big dataframes to see how much memory I am using to load them. Why was this removed? Can I bring it back? --- ## [Stop incorrect script path from silently failing](https://swan-community.web.cern.ch/t/stop-incorrect-script-path-from-silently-failing/828)
**Author:** [@smazenou](https://swan-community.web.cern.ch/u/smazenou)\ **Replies:** 1\ **Last updated:** [March 17, 2025, 4:06pm UTC](https://swan-community.web.cern.ch/t/stop-incorrect-script-path-from-silently-failing/828 "2025-03-17T16:06:16Z")
Hello, As a maintainer of the Sigmon analysis notebooks, we rely on our user to pass /eos/project/l/lhcsm/public/packages\_notebooks.sh as an environment script when logging into SWAN. However, on multiple occasions, use… --- ## [Local modules](https://swan-community.web.cern.ch/t/local-modules/825)
**Author:** [@rrossi](https://swan-community.web.cern.ch/u/rrossi)\ **Replies:** 6\ **Last updated:** [February 12, 2025, 8:16am UTC](https://swan-community.web.cern.ch/t/local-modules/825 "2025-02-12T08:16:50Z")
Hello there, I have recently moved some work from my local machine to SWAN. I’m having some issues with importing some local modules containing functions I have wrote in the years. Importing modules from a folder seem… --- ## [Always start with this configuration option](https://swan-community.web.cern.ch/t/always-start-with-this-configuration-option/823)
**Author:** [@hahamdao](https://swan-community.web.cern.ch/u/hahamdao)\ **Replies:** 2\ **Last updated:** [February 3, 2025, 2:03pm UTC](https://swan-community.web.cern.ch/t/always-start-with-this-configuration-option/823 "2025-02-03T14:03:10Z")
Hi community , I don’t see the Always start with this configuration option mentioned in help unless I need more coffee :smile: Could you please point me to it or let me know if its not available. --- ## [Kernel Error using 104a CentOS 7 (gcc11)](https://swan-community.web.cern.ch/t/kernel-error-using-104a-centos-7-gcc11/820)
**Author:** [@tmenezes](https://swan-community.web.cern.ch/u/tmenezes)\ **Replies:** 2\ **Last updated:** [January 28, 2025, 8:34pm UTC](https://swan-community.web.cern.ch/t/kernel-error-using-104a-centos-7-gcc11/820 "2025-01-28T20:34:47Z")
Dear experts, I was recently developing a Jupyter Notebook in the configuration: Software Stack: 104a Platform: CentOS 7 (gcc11) However, since yesterday, I’m getting a Kernel Error with the comment “XSRF cookie does… --- ## [Python talk this Thursday: Combining Jupyter and blender for 3d visualisation](https://swan-community.web.cern.ch/t/python-talk-this-thursday-combining-jupyter-and-blender-for-3d-visualisation/817)
**Author:** [@pelson](https://swan-community.web.cern.ch/u/pelson)\ **Replies:** 1\ **Last updated:** [January 17, 2025, 8:38am UTC](https://swan-community.web.cern.ch/t/python-talk-this-thursday-combining-jupyter-and-blender-for-3d-visualisation/817 "2025-01-17T08:38:19Z")
Dear SWAN community, This Thursday afternoon (14:00 in 6/2-024), there will be a CERN Computing Seminars and Colloquia from external speaker Jan-Hendrik Müller (@kolibril13.bsky.social on Bluesky), an enthusiast of Pyth… --- ## [CUDA Kernel Error with PyTorch - Mismatched CUDA Versions?](https://swan-community.web.cern.ch/t/cuda-kernel-error-with-pytorch-mismatched-cuda-versions/813)
**Author:** [@zhenliu](https://swan-community.web.cern.ch/u/zhenliu)\ **Replies:** 3\ **Last updated:** [December 19, 2024, 4:06pm UTC](https://swan-community.web.cern.ch/t/cuda-kernel-error-with-pytorch-mismatched-cuda-versions/813 "2024-12-19T16:06:43Z")
Hi, I’m encountering an issue when running PyTorch on NVIDIA A100 GPU using the “106a CUDA 12.3 (GPU)” software stack. Below is the test code I used: import torch print(f"PyTorch version: {torch.version}“) print(f"… --- ## [Using Helvetica font?](https://swan-community.web.cern.ch/t/using-helvetica-font/811)
**Author:** [@lgolino](https://swan-community.web.cern.ch/u/lgolino)\ **Replies:** 3\ **Last updated:** [December 16, 2024, 2:32pm UTC](https://swan-community.web.cern.ch/t/using-helvetica-font/811 "2024-12-16T14:32:52Z")
Is there really no way? Shouldn’t this just be installed? I tried directing to a .ttf but I just get ‘findfont: Font family ‘Helvetica’ not found.’ because the font file is still not finding it… --- ## [Ultralytics](https://swan-community.web.cern.ch/t/ultralytics/809)
**Author:** [@mdacunha](https://swan-community.web.cern.ch/u/mdacunha)\ **Replies:** 3\ **Last updated:** [December 11, 2024, 10:41am UTC](https://swan-community.web.cern.ch/t/ultralytics/809 "2024-12-11T10:41:33Z")
Dear all. I am trying to run yolov ultralytics package with GPU for training pattern recognition of images that uses tensorflow. This is for ATLAS phase-II upgrade of ITk-Pixels I did this already in the past. But appa… [Next page](https://swan-community.web.cern.ch/latest.md?page=1)