fix typo

logscoremetric.py

@@ -108,7 +108,7 @@ class LogScoreMetric(evaluate.Metric):
         
         # replace all digits in the reference timestamp (first timestamp) with '/d' to get
         # a regex that describes the format  
-        pred_timestring_pattern = re.sub(r'\d', r'\\d', re.escape(pred_timestrings[0])) if (len(pred_timestrings > 0)) else ""
+        pred_timestring_pattern = re.sub(r'\d', r'\\d', re.escape(pred_timestrings[0])) if (len(pred_timestrings) > 0) else ""
         
         # A variable to save the previous timestamp (as datetime obj) to check monotonicity
         prev_datetime = None