fix

map.py

@@ -73,8 +73,7 @@ class map(evaluate.Metric):
             # This defines the format of each prediction and reference
             features=datasets.Features({
                 'predictions':  datasets.Value("string"),
-                'references':  datasets.Value("string"),
-                'k': datasets.Value("int32")    
+                'references':  datasets.Value("string")
             }),
             # Homepage of the module for documentation
             reference_urls=["https://amenra.github.io/ranx/"]