China’s relentless campaign to be the dominant country in AI continues to escalate and create the world’s most valuable startups in the field with several worth over $1 billion now. Top of the list comes SenseTime, which specializes in facial recognition technology and has just raised $600 million in a new funding round led by Alibaba, China’s answer to Amazon. This takes SenseTime’s value up to $4.5 billion by some counts, while rivals are also ratcheting up, with Shanghai based Yitu Technology now ranked as the second biggest AI start-up at $2.4 billion. While SenseTime is China’s biggest start-up dedicated to AI, Didi Chuxing, the ride hailing company that bought out Uber in the country with 450 million users across…