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For anyone using this implementation, be aware the hierarchical sampling implementation used here is very slow compared to others.
A faster one can be found here (~20x faster in my benchmark):
https://github.com/yenchenlin/nerf-pytorch/blob/63a5a630c9abd62b0f21c08703d0ac2ea7d4b9dd/run_nerf_helpers.py#L196
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