Update app.py

app.py

@@ -318,7 +318,7 @@ def start_training(
         toolkit_src = os.path.join(dataset_folder, "ai-toolkit")
         if not os.path.exists(toolkit_src):
             subprocess.run(
-                f"git clone https://github.com/ostris/ai-toolkit.git {toolkit_src}", # ai-toolkit && cd ai-toolkit && git submodule update --init --recursive
+                f"git clone --depth 1 --filter=blob:none --sparse https://github.com/ostris/ai-toolkit.git {toolkit_src}", # ai-toolkit && cd ai-toolkit && git submodule update --init --recursive
                 shell=True,
                 check=True
             )