Update app.py

app.py

@@ -7,6 +7,7 @@ from numpy.core.multiarray import scalar
 import numpy
 
 # Add NumPy scalar and dtype to safe globals to fix UnpicklingError
+# This allowlists numpy.dtype to cover specific instances like numpy.dtype[float64]
 torch.serialization.add_safe_globals([scalar, numpy.dtype])
 
 # Preload the models at startup