fix bigbio imports

chia.py

@@ -26,6 +26,8 @@ import datasets
 from .bigbiohub import kb_features
 from .bigbiohub import BigBioConfig
 from .bigbiohub import Tasks
+from .bigbiohub import remove_prefix
+
 
 _LANGUAGES = ['English']
 _PUBMED = False
@@ -549,7 +551,7 @@ def parse_brat_file(txt_file: Path, annotation_file_suffixes: List[str] = None)
             ann["text"] = [fields[2]]
             ann["type"] = fields[1].split()[0]
             ann["offsets"] = []
-            span_str = parsing.remove_prefix(fields[1], (ann["type"] + " "))
+            span_str = remove_prefix(fields[1], (ann["type"] + " "))
             for span in span_str.split(";"):
                 start, end = span.split()
                 ann["offsets"].append([int(start), int(end)])