[Fix] Fix colab mmcv installation (#1779)

* fix mmcv installation

* add torch version and mmcv version

* fix typo

demo/MMSegmentation_Tutorial.ipynb

@@ -67,9 +67,10 @@
    "outputs": [],
    "source": [
     "# Install PyTorch\n",
-    "!conda install pytorch=1.10.0 torchvision cudatoolkit=11.1 -c pytorch\n",
+    "!pip install torch==1.12.0 torchvision --extra-index-url https://download.pytorch.org/whl/cu113\n",
     "# Install MMCV\n",
-    "!pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu111/torch1.10/index.html"
+    "!pip install openmim\n",
+    "!mim install mmcv-full==1.6.0"
    ]
   },
   {
@@ -439,6 +440,7 @@
    "outputs": [],
    "source": [
     "from mmseg.apis import set_random_seed\n",
+    "from mmseg.utils import get_device\n",
     "\n",
     "# Since we use only one GPU, BN is used instead of SyncBN\n",
     "cfg.norm_cfg = dict(type='BN', requires_grad=True)\n",
@@ -526,6 +528,7 @@
     "cfg.seed = 0\n",
     "set_random_seed(0, deterministic=False)\n",
     "cfg.gpu_ids = range(1)\n",
+    "cfg.device = get_device()\n",
     "\n",
     "# Let's have a look at the final config used for training\n",
     "print(f'Config:\\n{cfg.pretty_text}')"
@@ -618,7 +621,7 @@
    "provenance": []
   },
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3.10.4 ('colab')",
    "language": "python",
    "name": "python3"
   },
@@ -632,7 +635,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.10.4"
   },
   "pycharm": {
    "stem_cell": {
@@ -642,6 +645,11 @@
     },
     "source": []
    }
+  },
+  "vscode": {
+   "interpreter": {
+    "hash": "407d2a53ddc3f8f7c4edd35e4d9b95b1c1ccdf5b3711df67dd21487022baf36e"
+   }
   }
  },
  "nbformat": 4,