e pipeline was contributed by AndyShih12. ❤️  Tips This pipeline improves sampling speed by running denoising steps in parallel, at the cost of increased total FLOPs.
Therefore, it is better to call this pipeline when running on multiple GPUs. Otherwise, without enough GPU bandwidth
sampling may be even slower than sequential sampling. The two parameters to play with are parallel (batch size) and tolerance. If it fits in memory, for a 1000-step