[Fix] Update the version limitation of mmcv-full and pytorch in CI. (#7133)

* Update

* Update build.yml

* Update build.yml

.github/workflows/build.yml

@@ -37,19 +37,19 @@ jobs:
         include:
           - torch: 1.5.1
             torchvision: 0.6.1
-            mmcv: 1.5.0
+            mmcv: 1.5
           - torch: 1.6.0
             torchvision: 0.7.0
-            mmcv: 1.6.0
+            mmcv: 1.6
           - torch: 1.7.0
             torchvision: 0.8.1
-            mmcv: 1.7.0
+            mmcv: 1.7
           - torch: 1.8.0
             torchvision: 0.9.0
-            mmcv: 1.8.0
+            mmcv: 1.8
           - torch: 1.9.0
             torchvision: 0.10.0
-            mmcv: 1.9.0
+            mmcv: 1.9
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
@@ -91,19 +91,19 @@ jobs:
           - torch: 1.5.1+cu101
             torch_version: torch1.5.1
             torchvision: 0.6.1+cu101
-            mmcv: 1.5.0
+            mmcv: 1.5
           - torch: 1.6.0+cu101
             torch_version: torch1.6.0
             torchvision: 0.7.0+cu101
-            mmcv: 1.6.0
+            mmcv: 1.6
           - torch: 1.7.0+cu101
             torch_version: torch1.7.0
             torchvision: 0.8.1+cu101
-            mmcv: 1.7.0
+            mmcv: 1.7
           - torch: 1.8.0+cu101
             torch_version: torch1.8.0
             torchvision: 0.9.0+cu101
-            mmcv: 1.8.0
+            mmcv: 1.8
 
     steps:
       - uses: actions/checkout@v2
@@ -165,7 +165,7 @@ jobs:
           - torch: 1.9.0+cu102
             torch_version: torch1.9.0
             torchvision: 0.10.0+cu102
-            mmcv: 1.9.0
+            mmcv: 1.9
 
     steps:
       - uses: actions/checkout@v2

docs/en/get_started.md

@@ -107,6 +107,13 @@ Or you can still install MMDetection manually:
 
     Optionally you can compile mmcv from source if you need to develop both mmcv and mmdet. Refer to the [guide](https://github.com/open-mmlab/mmcv#installation) for details.
 
+    mmcv-full is only compiled on PyTorch 1.x.0 because the compatibility usually holds between 1.x.0 and 1.x.1. If your PyTorch version is 1.x.1, you can install mmcv-full compiled with PyTorch 1.x.0 and it usually works well.
+
+    ```
+    # We can ignore the micro version of PyTorch
+    pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu110/torch1.7/index.html
+    ```
+
 2. Install MMDetection.
 
     You can simply install mmdetection with the following command:

docs/zh_cn/get_started.md

@@ -115,6 +115,13 @@ MIM 能够自动地安装 OpenMMLab 的项目以及对应的依赖包。
     pip install mmcv-full
     ```
 
+    PyTorch 在 1.x.0 和 1.x.1 之间通常是兼容的，故 mmcv-full 只提供 1.x.0 的编译包。如果你的 PyTorch 版本是 1.x.1，你可以放心地安装在 1.x.0 版本编译的 mmcv-full。
+
+    ```
+    # 我们可以忽略 PyTorch 的小版本号
+    pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu110/torch1.7/index.html
+    ```
+
 2. 安装 MMDetection：
 
     你可以直接通过如下命令从 pip 安装使用 mmdetection: