Update app.py

app.py

@@ -31,6 +31,21 @@ import matplotlib.ticker as mticker
 from scipy import signal
 import gradio as gr
 
+# This app is CPU-only (librosa/scipy/matplotlib). The `spaces` import is only
+# needed if this Space is ever configured with ZeroGPU hardware, which requires
+# at least one @spaces.GPU-decorated function to exist at startup. Recommended
+# setting is "CPU basic" under Space Settings → Hardware, in which case `spaces`
+# won't even be installed and the block below is simply skipped.
+try:
+    import spaces
+
+    @spaces.GPU(duration=1)
+    def _zerogpu_keepalive():
+        """No-op so ZeroGPU Spaces pass their startup check. Not used on CPU."""
+        return None
+except ImportError:
+    pass
+
 # ──────────────────────────────────────────────────────────────────────────────
 # Constants
 # ──────────────────────────────────────────────────────────────────────────────