A good power bank is essential. Between my phone, headphones, tablet, and smartwatch, I feel like I always have one device or another begging me to plug it in. I actually carry around a power bank with me everywhere due to my chaotic, spontaneous lifestyle and refusal to charge my devices when they aren't actively dying. I purchased my favorite from our extensive list of the Best Power Banks, which features hand-tested picks from my fellow WIRED Reviews gadget experts. Several of their (and my) top picks are on sale right now.
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为什么需要非线性？ 想象一下，如果网络里每一层都是线性的（比如 y=Wx+b），无论堆叠多少层，最终网络都只是一条线性映射。深度堆叠就没有意义了，网络的表达能力非常有限。
这类并购之所以相对成功，在于潍柴背后有完整的发动机与动力系统产业链支撑，而不是单纯的财务投资冲动。