updates check answer logic

README.md

@@ -96,19 +96,24 @@ To check the answer, we use an exact match criteria:
 ```python
 import re
 
-
-def check_answer(
-    generation: str,
-    ground_truth: List[str]
-    ):
+def check_answer(generation: str, ground_truth: str) -> bool:
+    """
+    Args:
+        generation: model response, expected to contain "Answer: ..."
+        ground_truth: comma-separated string of correct answers
+
+    Returns: bool, whether the prediction matches the ground truth
+    """
     preds = generation.split("\n")[-1]
     preds = re.sub("Answer:", "", preds)
     preds = preds.split(",")
     preds = [p.strip() for p in preds]
     preds = sorted(preds, key=lambda x: x[0])
-    
-    ground_truth = sorted(ground_truth)
-    return preds == ground_truth
+
+    # split into a list
+    ground_truth_list = [a.strip() for a in ground_truth.split(",")]
+    ground_truth_list = sorted(ground_truth_list)
+    return preds == ground_truth_list
 ```