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Add PixelUnshuffle (#49334)

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Summary:
Adds an implementation of `torch.nn.PixelUnshuffle` as the inverse operation of `torch.nn.PixelShuffle`. This addresses https://github.com/pytorch/pytorch/issues/2456

Pull Request resolved: https://github.com/pytorch/pytorch/pull/49334

Test Plan:
```
# Unit tests.
python test/test_nn.py TestNN.test_pixel_shuffle_unshuffle

# Module test.
python test/test_nn.py TestNN.test_PixelUnshuffle

# C++ API tests.
build/bin/test_api

# C++ / python parity tests.
python test/test_cpp_api_parity.py

# JIT test.
python test/test_jit.py TestJitGeneratedFunctional.test_nn_pixel_unshuffle

# Override tests.
python test/test_overrides.py

# Type hint tests.
python test/test_type_hints.py
```

Screenshots of rendered docs:
<img width="876" alt="Screen Shot 2020-12-18 at 12 19 05 PM" src="https://user-images.githubusercontent.com/75754324/102642255-6b07bb00-412b-11eb-88fa-e53e7e8ba720.png">
<img width="984" alt="Screen Shot 2020-12-18 at 12 19 26 PM" src="https://user-images.githubusercontent.com/75754324/102642276-70fd9c00-412b-11eb-8548-445082a2db02.png">
<img width="932" alt="Screen Shot 2020-12-18 at 12 19 34 PM" src="https://user-images.githubusercontent.com/75754324/102642704-19abfb80-412c-11eb-9546-95bdd1c3cf22.png">
<img width="876" alt="Screen Shot 2020-12-22 at 12 51 36 PM" src="https://user-images.githubusercontent.com/75754324/102918259-986aa680-4454-11eb-99e7-a0b4c8b3e283.png">
<img width="869" alt="Screen Shot 2020-12-22 at 12 51 44 PM" src="https://user-images.githubusercontent.com/75754324/102918274-9ef91e00-4454-11eb-94bb-91b58aff47d3.png">

Reviewed By: mruberry

Differential Revision: D25401439

Pulled By: jbschlosser

fbshipit-source-id: 209d92ce7295e51699e83616d0c62170a7ce75c8
This commit is contained in:
Joel Schlosser
2020-12-22 20:12:40 -08:00
committed by Facebook GitHub Bot
parent 461aafe389
commit 68d438c9da
20 changed files with 371 additions and 56 deletions
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test/cpp_api_parity/parity-tracker.md
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@ -125,6 +125,7 @@ torch::nn::CosineEmbeddingLoss|Yes|No
torch::nn::MultiMarginLoss|Yes|No
torch::nn::TripletMarginLoss|Yes|No
torch::nn::PixelShuffle|Yes|No
torch::nn::PixelUnshuffle|Yes|No
torch::nn::Upsample|Yes|No
torch::nn::DataParallel|No|No
torch::nn::parallel::DistributedDataParallel|No|No