Update sonogram_utility.py

sonogram_utility.py

@@ -296,7 +296,7 @@ def calcCategories(myAnnotation,categories):
             categorySlots.append([])
             extraCategories.append(speaker)
             
-        for timeSegment in myAnnotation.subset[(speaker]).itersegments():
+        for timeSegment in myAnnotation.subset([speaker]).itersegments():
             categorySlots[targetCategory].append((speaker,timeSegment))
     # Clean up categories
     cleanCategories = []