This has been discussed a few times:

The link in this post does not work.
2020 Subject: AI investing post "I posted on the MD board some observations about AI and investing, and I used to post here and it relates to Mechanical Investing, I'll reference for friends here rather than double-post:"
http://www.datahelper.com/mi/search.phtml?nofool=y...

2017 Subject: Reinforcement Learning AI & Ln() "I'm building some reinforcement learning (RL) AI code (in Python)."
http://www.datahelper.com/mi/search.phtml?nofool=y...

2016 Subject: AI "Given the tools and principles already at hand, might it not be possible to autonomically mine available databases for ever more consistently successful strategies? "
http://www.datahelper.com/mi/search.phtml?nofool=y...

2011 Subject: OT:Could AI lead to a perfectly efficient market "Seems like science fiction and fantasy, but as the years tick by we're getting closer and closer."
http://www.datahelper.com/mi/search.phtml?nofool=y...

2002 Subject: an AI Raltive Strength Screen... "I am 100% scientifically convinced that the AI mode works better then Relative strength, and gives an added value. Secondly i am 100% scientifically convinced there is no need for monthly retraining the prove will follow."
http://www.datahelper.com/mi/search.phtml?nofool=y...

2002 Subject: An 1970-2001 AI Backtest "the matrix was fully 1970-2001 trained"
http://www.datahelper.com/mi/search.phtml?nofool=y...

2001 Subject: Jamie its time for some AI paraphrased: "Take the TOP 10 from a screen, look at the ranks (Valueline, Rank, etc.). Calculate average and standard deviation. Define TT = Average / Standard deviation. Rank the properties on TT and pick TOP TT"
http://www.datahelper.com/mi/search.phtml?nofool=y...