Baidu's  (BIDU) - Get Report shares were down more than 1% premarket after Andrew Ng, the company's chief scientist, announced that he will be resigning next month after leaving Alphabet  (GOOGL) - Get Report to join the company in 2014. 

The move is a blow for Baidu which has been making a push into machine intelligence as it looks to get back on sure footing. 

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