[Docs] Relax mmcv version requirement (#775)

* update ci and readme

* Update docs/en/install.md

* Update docs/zh_cn/install.md

Co-authored-by: Tong Gao <gaotongxiao@gmail.com>

.github/workflows/build.yml

@@ -87,24 +87,24 @@ jobs:
         torch: [1.6.0+cu101, 1.7.0+cu101, 1.8.0+cu101]
         include:
           - torch: 1.6.0+cu101
-            torch_version: 1.6.0
+            torch_version: 1.6
             torchvision: 0.7.0+cu101
           - torch: 1.7.0+cu101
-            torch_version: 1.7.0
+            torch_version: 1.7
             torchvision: 0.8.1+cu101
           - torch: 1.8.0+cu101
-            torch_version: 1.8.0
+            torch_version: 1.8
             torchvision: 0.9.0+cu101
           - torch: 1.8.0+cu101
-            torch_version: 1.8.0
+            torch_version: 1.8
             torchvision: 0.9.0+cu101
             python-version: 3.6
           - torch: 1.8.0+cu101
-            torch_version: 1.8.0
+            torch_version: 1.8
             torchvision: 0.9.0+cu101
             python-version: 3.8
           - torch: 1.8.0+cu101
-            torch_version: 1.8.0
+            torch_version: 1.8
             torchvision: 0.9.0+cu101
             python-version: 3.9
     steps:
@@ -176,14 +176,14 @@ jobs:
         torch: [1.9.0+cu102]
         include:
           - torch: 1.9.0+cu102
-            torch_version: 1.9.0
+            torch_version: 1.9
             torchvision: 0.10.0+cu102
           - torch: 1.9.0+cu102
-            torch_version: 1.9.0
+            torch_version: 1.9
             torchvision: 0.10.0+cu102
             python-version: 3.8
           - torch: 1.9.0+cu102
-            torch_version: 1.9.0
+            torch_version: 1.9
             torchvision: 0.10.0+cu102
             python-version: 3.9
     steps:

docs/en/install.md

@@ -57,6 +57,14 @@ Please replace ``{cu_version}`` and ``{torch_version}`` in the url with your des
 pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu110/torch1.7.0/index.html
 ```
 :::{note}
+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
+    ```
+:::
+:::{note}
 Note that mmocr 0.2.1 or later requires mmcv 1.3.8 or later.
 
 If it compiles during installation, then please check that the CUDA version and PyTorch version **exactly** matches the version in the `mmcv-full` installation command. For example, PyTorch 1.7.0 and 1.7.1 are treated differently.

docs/zh_cn/install.md

@@ -55,6 +55,14 @@ pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/{cu_version}/{
 pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu110/torch1.7.0/index.html
 ```
 :::{note}
+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
+```
+:::
+:::{note}
 使用 mmocr 0.2.0 及更高版本需要安装 mmcv 1.3.4 或更高版本。
 
 如果安装时进行了编译过程，请再次确认安装的 `mmcv-full` 版本与环境中 CUDA 和 PyTorch 的版本匹配。即使是 PyTorch 1.7.0 和 1.7.1，`mmcv-full` 的安装版本也是有区别的。