Update pip install info for tutorials. (#5236)

* update pip install info.

* update

* clarify the version

* blabla

* blabl

---------
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

notebooks/sparse/gcn.ipynb

@@ -36,9 +36,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "# TODO(Steve): change to stable version.\n",
-        "# Uncomment below to install required packages.\n",
-        "#!pip install --pre dgl -f https://data.dgl.ai/wheels-test/repo.html > /dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
         "\n",
         "try:\n",
         "    import dgl\n",

notebooks/sparse/graph_diffusion.ipynb

@@ -55,9 +55,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "# TODO(Steve): change to stable version.\n",
-        "# Uncomment below to install required packages.\n",
-        "#!pip install --pre dgl -f https://data.dgl.ai/wheels-test/repo.html > /dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
         "#!pip install --upgrade scipy networkx > /dev/null\n",
         "\n",
         "try:\n",

notebooks/sparse/graph_transformer.ipynb

@@ -24,9 +24,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "# TODO(Steve): change to stable version.\n",
-        "# Uncomment below to install required packages.\n",
-        "#!pip install --pre dgl -f https://data.dgl.ai/wheels-test/repo.html >/dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
         "#!pip install ogb >/dev/null\n",
         "\n",
         "try:\n",

notebooks/sparse/hgnn.ipynb

@@ -38,9 +38,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "# TODO(Steve): change to stable version.\n",
-        "# Uncomment below to install required packages.\n",
-        "#!pip install --pre dgl -f https://data.dgl.ai/wheels-test/repo.html > /dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
         "#!pip install torchmetrics > /dev/null\n",
         "\n",
         "try:\n",

notebooks/sparse/quickstart.ipynb

@@ -40,9 +40,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "# TODO(Steve): change to stable version.\n",
-        "# Uncomment below to install the required packages.\n",
-        "#!pip install --pre dgl -f https://data.dgl.ai/wheels-test/repo.html > /dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
         "\n",
         "try:\n",
         "    import dgl.sparse as dglsp\n",