Add OnnxConfig for ConvBERT (#16859)

* add OnnxConfig for ConvBert
Co-authored-by: ChainYo <t.chaigneau.tc@gmail.com>

docs/source/en/serialization.mdx

@@ -53,6 +53,7 @@ Ready-made configurations include the following architectures:
 - Blenderbot
 - BlenderbotSmall
 - CamemBERT
+- ConvBERT
 - Data2VecText
 - Data2VecVision
 - DistilBERT

src/transformers/models/convbert/__init__.py

@@ -21,7 +21,7 @@ from ...utils import _LazyModule, is_tf_available, is_tokenizers_available, is_t
 
 
 _import_structure = {
-    "configuration_convbert": ["CONVBERT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ConvBertConfig"],
+    "configuration_convbert": ["CONVBERT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ConvBertConfig", "ConvBertOnnxConfig"],
     "tokenization_convbert": ["ConvBertTokenizer"],
 }
 
@@ -58,7 +58,7 @@ if is_tf_available():
 
 
 if TYPE_CHECKING:
-    from .configuration_convbert import CONVBERT_PRETRAINED_CONFIG_ARCHIVE_MAP, ConvBertConfig
+    from .configuration_convbert import CONVBERT_PRETRAINED_CONFIG_ARCHIVE_MAP, ConvBertConfig, ConvBertOnnxConfig
     from .tokenization_convbert import ConvBertTokenizer
 
     if is_tokenizers_available():

src/transformers/models/convbert/configuration_convbert.py

@@ -14,7 +14,11 @@
 # limitations under the License.
 """ ConvBERT model configuration"""
 
+from collections import OrderedDict
+from typing import Mapping
+
 from ...configuration_utils import PretrainedConfig
+from ...onnx import OnnxConfig
 from ...utils import logging
 
 
@@ -138,3 +142,20 @@ class ConvBertConfig(PretrainedConfig):
         self.conv_kernel_size = conv_kernel_size
         self.num_groups = num_groups
         self.classifier_dropout = classifier_dropout
+
+
+# Copied from transformers.models.bert.configuration_bert.BertOnnxConfig
+class ConvBertOnnxConfig(OnnxConfig):
+    @property
+    def inputs(self) -> Mapping[str, Mapping[int, str]]:
+        if self.task == "multiple-choice":
+            dynamic_axis = {0: "batch", 1: "choice", 2: "sequence"}
+        else:
+            dynamic_axis = {0: "batch", 1: "sequence"}
+        return OrderedDict(
+            [
+                ("input_ids", dynamic_axis),
+                ("attention_mask", dynamic_axis),
+                ("token_type_ids", dynamic_axis),
+            ]
+        )

src/transformers/onnx/features.py

@@ -10,6 +10,7 @@ from ..models.big_bird import BigBirdOnnxConfig
 from ..models.blenderbot import BlenderbotOnnxConfig
 from ..models.blenderbot_small import BlenderbotSmallOnnxConfig
 from ..models.camembert import CamembertOnnxConfig
+from ..models.convbert import ConvBertOnnxConfig
 from ..models.data2vec import Data2VecTextOnnxConfig
 from ..models.distilbert import DistilBertOnnxConfig
 from ..models.electra import ElectraOnnxConfig
@@ -187,6 +188,15 @@ class FeaturesManager:
             "question-answering",
             onnx_config_cls=CamembertOnnxConfig,
         ),
+        "convbert": supported_features_mapping(
+            "default",
+            "masked-lm",
+            "sequence-classification",
+            "multiple-choice",
+            "token-classification",
+            "question-answering",
+            onnx_config_cls=ConvBertOnnxConfig,
+        ),
         "distilbert": supported_features_mapping(
             "default",
             "masked-lm",

tests/onnx/test_onnx_v2.py

@@ -175,6 +175,7 @@ PYTORCH_EXPORT_MODELS = {
     ("bigbird", "google/bigbird-roberta-base"),
     ("ibert", "kssteven/ibert-roberta-base"),
     ("camembert", "camembert-base"),
+    ("convbert", "YituTech/conv-bert-base"),
     ("distilbert", "distilbert-base-cased"),
     ("electra", "google/electra-base-generator"),
     ("roberta", "roberta-base"),