Sequence labeling refactoring

CONTRIBUTING.md

@@ -64,7 +64,7 @@ In general, it is recommended to ensure all basic tests are running through befo
 To ensure a standardized code style we use the formatter [black](https://github.com/ambv/black) and for standardizing imports we use [isort](https://github.com/PyCQA/isort).
 If your code is not formatted properly, the tests will fail.
 simply execute
-You can automatically format the code via `black . && isort .`
+You can automatically format the code via `black --config pyproject.toml flair/ && isort flair/` in the flair root folder.
 
 ### pre-commit hook
 

flair/data.py

@@ -116,6 +116,16 @@ def __len__(self) -> int:
     def get_item_for_index(self, idx):
         return self.idx2item[idx].decode("UTF-8")
 
+    def set_start_stop_tags(self):
+        self.add_item("<START>")
+        self.add_item("<STOP>")
+
+    def start_stop_tags_are_set(self):
+        if {"<START>".encode(), "<STOP>".encode()}.issubset(self.item2idx.keys()):
+            return True
+        else:
+            return False
+
     def save(self, savefile):
         import pickle