[skip ci] build pytorch 1.9.0

Author: rusty1s

.github/workflows/building.yml

@@ -10,10 +10,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # os: [ubuntu-18.04, macos-10.15, windows-latest]
-        os: [windows-latest]
-        python-version: [3.6, 3.7, 3.8, 3.9]
-        torch-version: [1.9.0]
+        os: [ubuntu-18.04, macos-10.15, windows-latest]
+        python-version: [3.9]
+        torch-version: [1.8.0]
         cuda-version: ['cpu', 'cu101', 'cu102', 'cu111']
         exclude:
           - torch-version: 1.9.0