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Add PyTorch backends: first pass #821

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merged 3 commits into from Aug 30, 2019

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@lewfish
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commented Aug 30, 2019

This PR adds chip classification and semantic segmentation backends based on PyTorch and fastai, along with a lot of infrastructure to simultaneously support the existing TF backends. Initially, I tried to create a single Docker image containing everything, but that approach was problematic. The existing version of Tensorflow in RV wasn't compatible with the latest PyTorch/Fastai because of a conflict in the versions of numpy and cuda. I could have tried to upgrade the three backends to use the latest version of Tensorflow, but I thought that was risky and not worth the effort if we're sunsetting the TF backends. So, I decided to just have separate images, which was quite a bit of work in and of itself.

Notes

A subsequent PR will add the following:

  • a lengthy changelog entry
  • integration tests for PyTorch backends
  • change the name of the backends from Fastai* to Pytorch* since we might end up going the pure pytorch route in the future
  • update docs

Related PRs: azavea/raster-vision-aws#26 and azavea/raster-vision-examples#66

@lewfish lewfish force-pushed the lf/fastai-backends2 branch from abbd91d to 5234606 Aug 30, 2019
@lewfish lewfish changed the title WIP: add pytorch backends Add PyTorch backends Aug 30, 2019
@lewfish lewfish changed the title Add PyTorch backends Add PyTorch backends: first pass Aug 30, 2019
@lewfish lewfish merged commit 1720647 into master Aug 30, 2019
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@lewfish lewfish deleted the lf/fastai-backends2 branch Aug 30, 2019
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