fix: join directroy / files with base_dir

brat.py

@@ -18,7 +18,7 @@ class BratConfig(BuilderConfig):
     description: Optional[str] = None
     citation: Optional[str] = None
     homepage: Optional[str] = None
-    
+
     # paths to directories or files per split (relative to url or data_dir)
     split_paths: Optional[Dict[str, Union[str, List[str]]]] = None
     file_name_blacklist: Optional[List[str]] = None
@@ -276,10 +276,15 @@ class Brat(datasets.GeneratorBasedBuilder):
         if files is None:
             if directory is None:
                 raise ValueError("Either files or directory has to be provided.")
-            _files = glob.glob(f"{directory}/*.{self.config.ann_file_extension}")
+            _directory = path.join(base_dir, directory)
+            _files = glob.glob(f"{_directory}/*.{self.config.ann_file_extension}")
             files = sorted(path.splitext(fn)[0] for fn in _files)
-        elif directory is not None:
-            raise ValueError("Only one of files or directory can be provided.")
+            if len(files) == 0:
+                raise ValueError(f"No files found in directory: {_directory}")
+        else:
+            if directory is not None:
+                raise ValueError("Only one of files or directory can be provided.")
+            files = [path.join(base_dir, fn) for fn in files]
 
         for filename in files:
             basename = path.basename(filename)