trial and error

It has taken time, trial and error to get that right.

The men understand nothing of their new situation and must learn the rules through trial and error.

It took a whole mess of trial and error, seeing what worked for me in terms of outlining everything, but then a few years ago, I felt like a little switch went on.

So was the technique that evolved through trial and error.

He says the algorithms use “reinforcement learning” - a method where AI systems learn by trial and error - and train themselves to detect behaviour towards different videos.