Print bias filename

mgr_biases.py

@@ -246,6 +246,7 @@ def loadCustomBiasSpec(filename: str):
 # Get predefined bias spec by name
 def loadPredefinedBiasSpec(filename: str):
   global PREDEFINED_BIASES_DIR
+  print(f"Loading predefined bias spec: {filename}")
   return get_bias_json(os.path.join(PREDEFINED_BIASES_DIR, filename))
 
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