Smart case: matching is case-insensitive unless the pattern contains
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There’s a special case here: if the map contains a register at the given key, but the register contains null, the map is considered to not contain the key.，推荐阅读PDF资料获取更多信息
Vinod Khosla has been thinking about artificial intelligence longer than most, and betting on it longer than almost anyone. The legendary venture capitalist who scored a 2,500x return with Juniper Networks and became the first institutional investor in OpenAI—wiring in $50 million at a $1 billion valuation—has a message for anyone fretting about AI taking their job: That’s probably going to happen, but it ultimately can be a good thing.，详情可参考电影
This is a density function which peaks sharply in the centre and falls off smoothly to zero at the boundaries. It’s defined as: