A visitor speaks to Baidu's robot Xiaodu at the 2015 Baidu World Conference in Beijing, China, September 8, 2015. REUTERS/Kim Kyung-Hoon Wall Street's excitement for AI could be tiring out, according to Bank of America. Investors just sold off $2 billion in tech shares, the largest outflow in 10 weeks. Previously, the bank called AI a "baby bubble," comparing it to the 2000s dot-com craze. Tech stocks just saw their biggest outflow in 10 weeks – a sign that the "baby bubble" in artificial intelligence stocks could be bursting. Investors sold off $2 billion in tech shares in the week...