and I explicitly mention two in my comment . One is just the price of the unit minus the costThat is not a profit margin . Nobody pretends it is . Only a complete idiot would even think that was a profit margin . <| sep |> Not that I ' m aware of <| sep |> I am a fairly knowledgable machine learning hobbyist and would like to say very emphatically that AlphaGo is in fact written by humans . The program is trained both from historical matches and from selfplay , but it does not change its source code . It changes a large number of parameters which it does by a simple algorithm , probably a variant of something called stochastic gradient descent , written by humans . <| sep |> The funny thing , is that in a crash like that , no amount of protective gear will save you . Not that I advocate against protective gear , of course . But I feel like a lot of motorcyclists allow themselves to be lured into a false sense of security when they are fully geared . A dude in shorts who rides within his limits is safer than a fully geared power ranger who treats a public road like a race track .