add zerogpu decorator

app.py

@@ -11,6 +11,12 @@ import soundfile as sf
 import librosa
 import gradio as gr
 
+try:
+    import spaces
+    def gpu_decorator(func): return spaces.GPU(func)
+except ImportError:
+    def gpu_decorator(func): return func
+
 from pymixconsole.parameter import Parameter
 from pymixconsole.parameter_list import ParameterList
 from pyharp import ModelCard, build_endpoint
@@ -211,6 +217,7 @@ model_card = ModelCard(
 )
 
 
+@gpu_decorator
 def process_fn(vocals_path, bass_path, drums_path, other_path):
     paths = {'vocals': vocals_path, 'bass': bass_path, 'drums': drums_path, 'other': other_path}