1. 什么是激活函数，为什么需要激活函数
They started out in the NFL as tenants at Wrigley Field, sharing the baseball cathedral with the Cubs for 50 seasons before the league insisted all teams play in a stadium with a capacity of at least 50,000. So in 1971, the Bears decamped to Soldier Field, where they’ve been ever since – save for a season-long “road trip” in 2002 to the University of Illinois’ Memorial Stadium during renovations. Soldier Field is prime football real estate: neoclassical, on the downtown lakefront, with sweeping views of one of America’s most sumptuous skylines. But the lease terms are crazy, the city park district (which owns the stadium) is a borderline slumlord, and the Bears – star-crossed to play in the league’s oldest and smallest stadium while representing its third-largest market – have outgrown the place.
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看脱贫地区，“产业普遍搞起来了，但技术、资金、人才、市场等支撑还不强”。
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