I am doing some machine learning and need to run unity on linux but didn't come across the stable release, if anyone is working on unity on linux, please point me towards a stable release.
No. At this time the Unity site still refers to the Linux editor as an "experimental" Beta feature. There is not a stable release. The latest Linux builds, release notes, and known issues are documented in this Unity forum thread.
In future, please direct this type of software query to the makers of that software. Because it's time-sensitive (maybe in two months there will be a stable Linux build released), handling it through our Q&A here risks leaving misleading signposts for future users.
(So, if you're a future user reading this after May 2018: don't take my word for it — check the manufacturer's website for the most up to date information)