move git clone repo

app.py

@@ -16,8 +16,6 @@ from huggingface_hub import hf_hub_download
 def main(input_file_path, species):
     
     # clone and cd into UCE repo
-    os.system('git clone https://github.com/minwoosun/UCE.git')
-    os.chdir('UCE')
 
     ##############
     #     UCE    #
@@ -83,6 +81,9 @@ def main(input_file_path, species):
 
     
 if __name__ == "__main__":   
+    
+    os.system('git clone https://github.com/minwoosun/UCE.git')
+    os.chdir('UCE')
 
     # Define Gradio inputs and outputs
     file_input = gr.File(label="Upload a .h5ad single cell gene expression file")