electra is added to onnx supported model (#15084)

* electra is added to onnx supported model

* add google/electra-base-generator for test onnx module
Co-authored-by: Lewis Tunstall <lewis.c.tunstall@gmail.com>

docs/source/serialization.mdx

@@ -50,6 +50,7 @@ Ready-made configurations include the following architectures:
 - BERT
 - CamemBERT
 - DistilBERT
+- ELECTRA
 - GPT Neo
 - I-BERT
 - LayoutLM

src/transformers/models/electra/__init__.py

@@ -22,7 +22,7 @@ from ...file_utils import _LazyModule, is_flax_available, is_tf_available, is_to
 
 
 _import_structure = {
-    "configuration_electra": ["ELECTRA_PRETRAINED_CONFIG_ARCHIVE_MAP", "ElectraConfig"],
+    "configuration_electra": ["ELECTRA_PRETRAINED_CONFIG_ARCHIVE_MAP", "ElectraConfig", "ElectraOnnxConfig"],
     "tokenization_electra": ["ElectraTokenizer"],
 }
 
@@ -71,7 +71,7 @@ if is_flax_available():
 
 
 if TYPE_CHECKING:
-    from .configuration_electra import ELECTRA_PRETRAINED_CONFIG_ARCHIVE_MAP, ElectraConfig
+    from .configuration_electra import ELECTRA_PRETRAINED_CONFIG_ARCHIVE_MAP, ElectraConfig, ElectraOnnxConfig
     from .tokenization_electra import ElectraTokenizer
 
     if is_tokenizers_available():

src/transformers/models/electra/configuration_electra.py

@@ -15,7 +15,11 @@
 # limitations under the License.
 """ ELECTRA model configuration"""
 
+from collections import OrderedDict
+from typing import Mapping
+
 from ...configuration_utils import PretrainedConfig
+from ...onnx import OnnxConfig
 from ...utils import logging
 
 
@@ -170,3 +174,15 @@ class ElectraConfig(PretrainedConfig):
         self.position_embedding_type = position_embedding_type
         self.use_cache = use_cache
         self.classifier_dropout = classifier_dropout
+
+
+class ElectraOnnxConfig(OnnxConfig):
+    @property
+    def inputs(self) -> Mapping[str, Mapping[int, str]]:
+        return OrderedDict(
+            [
+                ("input_ids", {0: "batch", 1: "sequence"}),
+                ("attention_mask", {0: "batch", 1: "sequence"}),
+                ("token_type_ids", {0: "batch", 1: "sequence"}),
+            ]
+        )

src/transformers/onnx/features.py

@@ -7,6 +7,7 @@ from ..models.bart import BartOnnxConfig
 from ..models.bert import BertOnnxConfig
 from ..models.camembert import CamembertOnnxConfig
 from ..models.distilbert import DistilBertOnnxConfig
+from ..models.electra import ElectraOnnxConfig
 from ..models.gpt2 import GPT2OnnxConfig
 from ..models.gpt_neo import GPTNeoOnnxConfig
 from ..models.ibert import IBertOnnxConfig
@@ -209,6 +210,15 @@ class FeaturesManager:
             "token-classification",
             onnx_config_cls=LayoutLMOnnxConfig,
         ),
+        "electra": supported_features_mapping(
+            "default",
+            "masked-lm",
+            "causal-lm",
+            "sequence-classification",
+            "token-classification",
+            "question-answering",
+            onnx_config_cls=ElectraOnnxConfig,
+        ),
     }
 
     AVAILABLE_FEATURES = sorted(reduce(lambda s1, s2: s1 | s2, (v.keys() for v in _SUPPORTED_MODEL_TYPE.values())))

tests/test_onnx_v2.py

@@ -174,6 +174,7 @@ PYTORCH_EXPORT_MODELS = {
     ("ibert", "kssteven/ibert-roberta-base"),
     ("camembert", "camembert-base"),
     ("distilbert", "distilbert-base-cased"),
+    ("electra", "google/electra-base-generator"),
     ("roberta", "roberta-base"),
     ("xlm-roberta", "xlm-roberta-base"),
     ("layoutlm", "microsoft/layoutlm-base-uncased"),