Change sum() to ndarray.sum()

Author: kotamatsuoka

pandas/core/algorithms.py

@@ -724,7 +724,7 @@ def value_counts(
         result = result.sort_values(ascending=ascending)
 
     if normalize:
-        result = result / float(sum(counts))
+        result = result / float(counts.to_numpy().sum())
 
     return result