Fix get labels (#834)

* black style

* fixing label loading

* multilabel -> label

* fixing

* fixing nit

* getting rid of one hot vectorization

* fixing all_labels function callk

* delete get_all_labels

Author: Yada Pruksachatkun

jiant/tasks/tasks.py

@@ -2263,7 +2263,6 @@ def __init__(
         self._iters_by_split = None
 
         self.label_file = os.path.join(path, label_file)
-        self.all_labels = None
         self.n_classes = None
         self._label_namespace = self.name + "_labels"
 
@@ -2350,9 +2349,6 @@ def _map_fn(r, idx):
 
         return map(_map_fn, records, itertools.count())
 
-    def get_all_labels(self) -> List[str]:
-        return self.all_labels
-
     def get_sentences(self) -> Iterable[Sequence[str]]:
         """ Yield sentences, used to compute vocabulary. """
         for split, iter in self._iters_by_split.items():