Manage impossible examples SQuAD v2

src/transformers/data/processors/squad.py

@@ -242,6 +242,7 @@ def squad_convert_example_to_features(example, max_seq_length, doc_stride, max_q
                 token_to_orig_map=span["token_to_orig_map"],
                 start_position=start_position,
                 end_position=end_position,
+                is_impossible=span_is_impossible
             )
         )
     return features
@@ -332,6 +333,7 @@ def squad_convert_examples_to_features(
         all_token_type_ids = torch.tensor([f.token_type_ids for f in features], dtype=torch.long)
         all_cls_index = torch.tensor([f.cls_index for f in features], dtype=torch.long)
         all_p_mask = torch.tensor([f.p_mask for f in features], dtype=torch.float)
+        all_is_impossible = torch.tensor([f.is_impossible for f in features], dtype=torch.float)
 
         if not is_training:
             all_example_index = torch.arange(all_input_ids.size(0), dtype=torch.long)
@@ -349,6 +351,7 @@ def squad_convert_examples_to_features(
                 all_end_positions,
                 all_cls_index,
                 all_p_mask,
+                all_is_impossible
             )
 
         return features, dataset
@@ -369,6 +372,7 @@ def squad_convert_examples_to_features(
                         "end_position": ex.end_position,
                         "cls_index": ex.cls_index,
                         "p_mask": ex.p_mask,
+                        "is_impossible": ex.is_impossible
                     },
                 )
 
@@ -376,7 +380,7 @@ def squad_convert_examples_to_features(
             gen,
             (
                 {"input_ids": tf.int32, "attention_mask": tf.int32, "token_type_ids": tf.int32},
-                {"start_position": tf.int64, "end_position": tf.int64, "cls_index": tf.int64, "p_mask": tf.int32},
+                {"start_position": tf.int64, "end_position": tf.int64, "cls_index": tf.int64, "p_mask": tf.int32, "is_impossible": tf.int32},
             ),
             (
                 {
@@ -389,6 +393,7 @@ def squad_convert_examples_to_features(
                     "end_position": tf.TensorShape([]),
                     "cls_index": tf.TensorShape([]),
                     "p_mask": tf.TensorShape([None]),
+                    "is_impossible": tf.TensorShape([])
                 },
             ),
         )
@@ -658,6 +663,7 @@ class SquadFeatures(object):
         token_to_orig_map,
         start_position,
         end_position,
+        is_impossible
     ):
         self.input_ids = input_ids
         self.attention_mask = attention_mask
@@ -674,7 +680,7 @@ class SquadFeatures(object):
 
         self.start_position = start_position
         self.end_position = end_position
-
+        self.is_impossible = is_impossible
 
 class SquadResult(object):
     """