replace assertion with warning

jer.py

@@ -19,6 +19,9 @@ from typing import Callable, Iterable, Union
 import evaluate
 import datasets
 import numpy as np
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 # TODO: Add BibTeX citation
@@ -102,7 +105,8 @@ class jer(evaluate.Metric):
             eq_fn: Callable[[Triplet, Triplet], bool],
         ):
         reference_set = set(reference)
-        assert len(reference) == len(reference_set), f"Duplicates found in the reference list {reference}"
+        if len(reference) != len(reference_set):
+            logger.warn(f"Duplicates found in the reference list {reference}")
         prediction_set = set(prediction)
 
         tp = sum(int(is_in(item, prediction, eq_fn=eq_fn)) for item in reference)