PyTorch 1.7でtorch-scatterをインストール

#環境

• Windows 10
• python 3.6.11
• Pytorch 1.7.0
• torch-scatter 2.0.5

#取り急ぎ成功したので急いでメモ。

$ pip install torch-scatter -f https://pytorch-geometric.com/whl/torch-1.7.0.html
Looking in links: https://pytorch-geometric.com/whl/torch-1.7.0.html
Collecting torch-scatter
  Downloading https://pytorch-geometric.com/whl/torch-1.7.0/torch_scatter-2.0.5%2Bcu110-cp36-cp36m-win_amd64.whl (2.4
MB)
     |████████████████████████████████| 2.4 MB 544 kB/s
Installing collected packages: torch-scatter
Successfully installed torch-scatter-2.0.5

#しかし動かそうとすると失敗

$ python natura/bin/pytorch_sample.py
Traceback (most recent call last):
  File "natura/bin/pytorch_sample.py", line 9, in <module>
    from torch_scatter import scatter_max
  File "C:\Users\dff40\.conda\envs\pytorch04gpu\lib\site-packages\torch_scatter\__init__.py", line 12, in <module>
    library, [osp.dirname(__file__)]).origin)
  File "C:\Users\dff40\.conda\envs\pytorch04gpu\lib\site-packages\torch\_ops.py", line 105, in load_library
    ctypes.CDLL(path)
  File "C:\Users\dff40\.conda\envs\pytorch04gpu\lib\ctypes\__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] 指定されたモジュールが見つかりません。
(pytorch04gpu)

#あきらめず
エラー内容はGPU関連っぽい。CPU版をインストールすればよいかも。そこでアンインストールして以下を実行

$ pip install torch-scatter==latest+cpu -f https://pytorch-geometric.com/whl/torch-1.7.0.html
Looking in links: https://pytorch-geometric.com/whl/torch-1.7.0.html
Collecting torch-scatter==latest+cpu
  Downloading https://pytorch-geometric.com/whl/torch-1.7.0/torch_scatter-latest%2Bcpu-cp36-cp36m-win_amd64.whl (289 k
B)
     |████████████████████████████████| 289 kB 364 kB/s
Installing collected packages: torch-scatter
Successfully installed torch-scatter-2.0.5

これでさっきのコマンドを動かすと無事動いた！