Update NQ_squad_format.py

NQ_squad_format.py

@@ -98,6 +98,8 @@ class Squad(datasets.GeneratorBasedBuilder):
         with open(filepath, 'rb') as f:
             data = json.load(f)
         print("example data: ", data[0])
+        print("number of data: ", len(data))
+        print("data keys: ", data[0].keys())
         for line in data:
             yield key, {
                 "context": line['context'],