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I have six gopro in an spherical arrangement and each one produces 960p video at 120fps, this renders a spherical 4k video.

From what I read they can process Yolo 6fps on multiple GPUs. Is a 20x speedup with more gpu possible based on their architecture?

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Well for training attention-cnn model I think it.would speed it up, but as they note in the paper, running the pipeline they experienced worker saturation on their dataset (see figure 12). Looks like saturation occurs after 7 parallel workers with their hardware.

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