Update helper.py

helper.py

@@ -61,14 +61,17 @@ def summarize_predictions_natural_language(predictions):
     result_string = "In this image, there are "
     for i, (label, count) in enumerate(summary.items()):
         count_string = p.number_to_words(count)
-        result_string += f"{count_string} {label}"
+        if i == 0 or i != len(summary) - 2:
+            result_string += f"{count_string} {label}"
+        else:
+            result_string += f",{count_string} {label}"
         if count > 1:
           result_string += "s"
 
         result_string += " "
 
         if i == len(summary) - 2:
-          result_string += "and "
+          result_string += ", and "
 
     # Remove the trailing comma and space
     result_string = result_string.rstrip(', ') + "."