Update app.py

app.py

@@ -1,3 +1,6 @@
+import os   # to check if file exists
+import sys  # to flush stdout
+
 import gradio as gr
 #import transformers
 #from transformers import pipeline
@@ -12,10 +15,17 @@ model_filename="nous-hermes-13b.ggmlv3.q4_K_S.bin"
 
 def download_model():
     # See https://github.com/OpenAccess-AI-Collective/ggml-webui/blob/main/tabbed.py
-    file = hf_hub_download(
-            repo_id=model_repo, filename=model_filename
-    )
-    return file
+    file_path=/home/user/.cache/huggingface/hub/models--TheBloke--Nous-Hermes-13B-GGML/snapshots/f1a48f90a07550e1ba30e347b2be69d4fa5e393b/nous-hermes-13b.ggmlv3.q4_K_S.bin
+    if os.path.exists(file_path):
+        return file_path
+    else:
+        print("Downloading model...")
+        sys.stdout.flush()
+        file = hf_hub_download(
+                repo_id=model_repo, filename=model_filename
+        )
+        print("Downloaded " + file)
+        return file
 
 def question_answer(context, question):
     mfile=download_model()