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ultralytics / yolov5

YOLOv5 🚀 in PyTorch > ONNX > CoreML > TFLite
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Why is the inference time with a batchsize of 32 less than that with a batchsize of 1? #12207

Closed arkerman closed 10 months ago

arkerman commented 1 year ago

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Question

Why is the inference time with a batchsize of 32 less than that with a batchsize of 1?

Additional

Any suggestion will be appreciated.

glenn-jocher commented 1 year ago

@arkerman in general, increasing the batch size in YOLOv5 can improve inference time due to the parallelization of computations across multiple inputs. This is because the GPU can process multiple images simultaneously, thereby reducing the overall time required for inference.

However, the actual improvement in inference time can depend on various factors such as the hardware setup, model architecture, and input image size. In some cases, increasing the batch size may lead to diminishing returns or even slower inference times, particularly if the GPU memory becomes a bottleneck.

It's worth noting that the benefits of larger batch sizes are typically more pronounced when processing a large number of images in parallel, like in training, as compared to single-image inference scenarios. Therefore, the exact performance difference between batch sizes of 1 and 32 can vary based on your specific use case and hardware configuration.

Please remember that the YOLO community and the Ultralytics team have contributed significantly to the development and optimization of YOLOv5. Many of the improvements in inference speed are a result of their collective efforts.

If you have any further questions or need additional assistance, feel free to ask.

arkerman commented 1 year ago

@glenn-jocher Thanks for your reply! I really appreciate it!

glenn-jocher commented 1 year ago

@arkerman you're welcome! I'm glad I could help. However, any credit should go to the amazing YOLO community and the dedicated team at Ultralytics who have contributed to the development and optimization of YOLOv5. Let me know if there's anything else I can assist you with.

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