Update scores/bsseval.py

scores/bsseval.py

@@ -12,7 +12,7 @@ class BSSEval(ScoreBasis):
         bss_hop = np.inf
         from museval.metrics import bss_eval
         if len(audios) != 2:
-            raise ValueError('BSSEval needs a reference and a test signals.')
+            return None
         
         result = bss_eval(reference_sources=audios[1][None,...], # shape: [nsrc, nsample, nchannels]
                         estimated_sources=audios[0][None,...],