The easiest way to get to EPFL by public transport is to arrive in Renens train station, then take the metro M1 in direction Lausanne – Flon. The M1 leaves from Renens next to platform 1. You take the M1 until the stop EPFL, the ride takes about 9 min from Renens. When you exit the metro at the stop EPFL turn to the left, walk down the ramp and turn to the left when you are in the underground passage. Walk up the stairs which you see after turning left, and down the wide corridor in between buildings until you see the venue (at your right) and signs for the SSCr2025 meeting.

Travelling through Lausanne train station, along with other options, is described here.