Deep Patch Visual Odometry

注意Track的建立的过程，可以人为随机选取一些稀疏的patch，用这些稀疏的patch和上一帧去匹配（类似预raft）

To summarize, we contribute Deep Patch Visual Odometry, a new method for tracking camera motion from video. DPVO uses a novel recurrent network designed for sparse patch-based correspondence. DPVO outperforms all prior work across several evaluation datasets, while running 3x faster than the previous state-of-art using less than a third of the memory.