fuse the install into app.py

app.py

@@ -1,3 +1,10 @@
+import subprocess
+
+# a workaround for gradio SDK
+# git clone https://github.com/yuanze1024/Pointnet2_PyTorch.git && cd Pointnet2_PyTorch/pointnet2_ops_lib && pip install .
+subprocess.call(["git", "clone", "https://github.com/yuanze1024/Pointnet2_PyTorch.git"])
+subprocess.call(["pip", "install", "."], cwd="Pointnet2_PyTorch/pointnet2_ops_lib")
+
 import os
 import random
 import gradio as gr