Update app.py

app.py

@@ -20,7 +20,7 @@ def start_train():
         os.system(f"echo 'Requested hardware is {hardware}'")
         curr_runtime = API.get_space_runtime(repo_id=REPO_ID)
         os.system(f"echo 'Current hardware is {curr_runtime}'")
-        if curr_runtime['hardware'] != hardware:
+        if curr_runtime.hardware != hardware:
             os.system("echo 'Trying to switch.'")
             API.request_space_hardware(repo_id=REPO_ID, hardware=hardware)
         for model in model_file: