Speed up inference There are several ways to optimize 🤗 Diffusers for inference speed. As a general rule of thumb, we recommend using either xFormers or torch.nn.functional.scaled_dot_product_attention in PyTorch 2.0 for their memory-efficient attention. In many cases, optimizing for speed or memory leads to improved performance in the other, so you should try to optimize for both whenever you can. This guide focuses on inference speed, but you can learn more about preserving memory in the Reduce memory usage guide. The results below are obtained from generating a single 512x512 image from the prompt a photo of an astronaut riding a horse on mars with 50 DDIM steps on a Nvidia Titan RTX, demonstrating the speed-up you can expect.  latency speed-up original 9.50s x1 fp16 3.61s x2.63 channels last 3.30s x2.88 traced UNet 3.21s x2.96 memory efficient attention 2.63s x3.61  Use TensorFloat-32 On Ampere and later CUDA devices, matrix multiplications and convolutions can use the TensorFloat-32 (TF32) mode for faster, but slightly less accurate computations. By default, PyTorch enables TF32 mode for convolutions but not matrix multiplications. Unless your network requires full float32 precision, we recommend enabling TF32 for matrix multiplications. It can significantly speeds up computations with typically negligible loss in numerical accuracy.   Copied import torch