Has anyone used machine learning to trade?
Keyframe: of course, get MetaTrader4, open up a demo account on FXCM, Alpari, dbFX or whatever and write your own software and backtest it without losing any money. Boston Technologies has a free expert advisor, maybe you can build up on it - http://www.bostontechnologies.com/expertadvisors.html . I am not keen on automated trading though, since I do a bit of TA and FA, no software I know can do this - and where is the fun in it.