Welcome to the ICML 2021 virtual conference!


Latest News

Keep up to date on the latest conference news at the ICML Blog

Getting Started

A icml.cc login and an ICML 2021 registration are required to access the content. Everyone is expected to follow the Code of Conduct. To jump right into the conference program, once you are registered, we recommend that you go to the conference schedule and read on below to learn more about how to use all elements of the virtual conference site. View the Welcome Video from Nina Balcan, General Chair and the Welcome Address Video from the Program Chairs. Thank you to all the organizers who made ICML 2021 possible.

If you can not find answers here use the help links at the bottom of the page.

System Requirements

JavaScript must be enabled in your browser. A 10 mb of inbound bandwidth is recommended.  A Chromium browser is recommended.

Navigating the Website

All of ICML 2021 will be accessed through the main webpage. You may access all parts of the conference using the top menu bar. Check the Schedule to get an overview of when the live sessions for all events are taking place. You may navigate all the papers in the Papers section. You may search for titles and authors or look through all papers by skimming titles and bookmarking them. You can bookmark other sessions as well. If you go to your name in the top right corner and click on My Bookmarks in the dropdown menu, you can Download the schedule with all sessions you bookmarked and you can import it in your calendar. You can take a break and socialize in the ICML Café any time during the conference. 

Poster Sessions

The poster sessions will be held in GatherTown. You can access the poster in GatherTown by clicking "Visit Poster at Spot XX in Virtual World" on the paper's page. Note that the first part of the poster session, up to 30 minutes, may be overlapping with the extended Q&A time for the Invited talk in the same time block. During this period of overlap, poster presenters are not required to be at their posters. Attendees can stay at the Q&A or enter the poster session. We recommend that all poster presenters are present at their poster at the beginning of the second hour of the poster session, to maximize the chance of engaging with the attendees.


We encourage everyone to visit the sponsor hall just like you would at the physical conference. The sponsors have job listings, demonstrations, and chats ready for you.  

Some sponsors have a Topia virtual (spatial) world. Topia only supports Chromium browsers.  When authenticating choose "Sign in with Email" in red rather than authenticating with Facebook or Google, and use your icml.cc email address.


All attendees with registration will automatically have access to Rocket.Chat, a separate Rocket.Chat account is not needed. If you have problems with Rocket.Chat try refreshing the page. If that does not work try logging out and then logging back in.

Each session has a Rocket.Chat channel. Questions for the speakers should be posted there. Other participants that are also interested in the question can comment or put emoji on the post to increase its visibility. Eventually, the moderator will select questions to ask the speaker. Speakers will be able to continue answering questions on Rocket.Chat after the end of their talk for approximately one hour.

  • HelpDesk
    There is a #HelpDesk channel in Rocket.Chat where you can post any conference support questions. If you are not able to access Rocket.Chat, send an email to helpdesk@icml.cc.
  • Full Screen Mode
    You can run Rocket.Chat in Full-Screen Mode which lists all the channels you've visited. To go to Full-Screen Mode click on the Full [ ] icon in the top right corner. When prompted select Authenticate with OAuth and then click the blue Authorize button in the Authorize Rocket.Chat window
  • Desktop Client
    You can also use the desktop client which provides better notification. You can download the desktop client for your platform here. When you run it enter the server URL: https://chat.icml.cc. You may be prompted to log into icml.cc. After you log in, select Authenticate with OAuth and then click the blue Authorize button in the Authorize Rocket.Chat window


  • Each event has a live stream on the top of the page that you can watch during and after the presentation.
  • Finished videos will be available after the conference.


  • Watch the video on how to use GatherTown.
  • GatherTown can be used on a laptop or desktop using Google Chrome, Microsoft Edge, Brave, or Firefox.
  • In each town, there will be a user named "Helpdesk - Firstname". If you need help, find them or write in the #HelpDesk channel.
  • For internet speeds, we recommend 10 Mbps download and 3 Mbps upload.
  • To get all advantages of GatherTown, you should have a camera and microphone on.
  • You may be asked to log into "gathertown.eventhosts.cc" the first time you access GatherTown.
  • Join the ICML Café to hang out and chat with others! 


  • Some Sponsors have booths in Topia
  • Topia requires a Chrome, Edge, Brave, or another Chromium-based browser
  • Topia requires access to your camera and microphone
  • The first time you access Topia you will need to login using the same email that you use for icml.cc
  • How to use Topia


This is a cautionary tale about timezones. Several attendees have noticed that the times shown on the virtual website appeared incorrect.   The problem was that they chose a timezone that did not adjust for daylight savings time.   We highly recommend picking a timezone based on a nearby city, especially if your area observes daylight savings time. Timezones are political and complex and thus confusing. Please check your timezone, and preferably choose a zone based on a city.   Note that we are currently in Daylight Savings Time rather than Standard time in most, but not all of the US and Europe. 

Your current timezone: . (Note: the paper browser uses your system timezone.)

Getting Help

  • For technical difficulties, please contact #HelpDesk on Rocket.Chat. Schedule and Papers pages may be a bit slower to load the first time you access them.
  • If you have problems with Rocket.Chat try refreshing the page and if that does not work try logging out and then logging back in. If you still can't access it, send an email to helpdesk@icml.cc.
  • If you have concerns related to your inclusion at that conference, or observe someone else's difficulties, or have any other concerns related to inclusion, please use this form.