Hibernation usually takes place October/November to March/April.
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优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Brewster has a clear picture of the typical SpeedPro franchisee: midcareer, corporate and ready for a change. They are around 45 to 55 years old, and they have worked for a corporation and hit middle management. “What they do is they step back and say, ‘I’m gonna bet on myself,’” Brewster says.