add encoding='utf-8'

brat.py

@@ -235,7 +235,7 @@ class Brat(datasets.GeneratorBasedBuilder):
             "notes": [],
         }
 
-        with open(filename) as file:
+        with open(filename, encoding="utf-8") as file:
             for i, line in enumerate(file):
                 if len(line.strip()) == 0:
                     continue
@@ -299,7 +299,7 @@ class Brat(datasets.GeneratorBasedBuilder):
             brat_annotations = Brat._read_annotation_file(ann_fn)
 
             txt_fn = f"{filename}.{self.config.txt_file_extension}"
-            txt_content = open(txt_fn).read()
+            txt_content = open(txt_fn, encoding="utf-8").read()
             brat_annotations["context"] = txt_content
             brat_annotations["file_name"] = basename