To avoid responding with "that's what Andrew NG said" when asked about the reason behind choosing an 80% training and 20% validation split, consider this explanation.
Read it!A story about the first year of working at Stack Overflow after transitioning from academia.
Read it!"Even though I’m one of the beneficiary of this AI craze, I can’t help but thinking this will burst. I don’t know how and when, but I have this belief that the system is currently being rigged in favor of people whose resumes dotted with fancy keywords like mine, and a rigged system can’t be sustainable."
Read it!