Learn how to use a seam ripper properly to remove unwanted stitches and fix sewing mistakes quickly and safely while keeping your fabric clean and ready for your next sewing step #sewing #sewingtutori ...

// 1. 返回前面的thread向后面的thread要的数据，比如__shfl_down_sync(0xffffffff, sum, 16)那就是返回16号线程，17号线程的数据 // 2. 使用 ...