identity function for slices that are already allocated in the heap.
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，详情可参考safew官方版本下载
Most surprisingly, the Uncharted is the first front-wheel-drive Subaru sold in the United States since the Impreza switched to all-wheel-drive for model year 1997. The base FWD Uncharted will therefore offer a class-leading range estimate of 308 miles (496 km), while the Sport AWD trim can do 287 miles (462 km). Subaru has reportedly partnered with Panasonic to develop solid-state batteries for a Solterra replacement, but that project is still in development.，推荐阅读旺商聊官方下载获取更多信息
优点： 更平滑、更稳定，效果普遍优于 ReLU。