Add ONNX export for ViT (#15658)

* Add ONNX support for ViT

* Refactor to use generic preprocessor

* Add vision dep to tests

* Extend ONNX slow tests to ViT

* Add dummy image generator

* Use model_type to determine modality

* Add deprecation warnings for tokenizer argument

* Add warning when overwriting the preprocessor

* Add optional args to docstrings

* Add minimum PyTorch version to OnnxConfig

* Refactor OnnxConfig class variables from CONSTANT_NAME to snake_case

* Add reasonable value for default atol

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

.circleci/config.yml

@@ -783,7 +783,7 @@ jobs:
                       - v0.4-torch-{{ checksum "setup.py" }}
                       - v0.4-{{ checksum "setup.py" }}
             - run: pip install --upgrade pip
-            - run: pip install .[torch,testing,sentencepiece,onnxruntime]
+            - run: pip install .[torch,testing,sentencepiece,onnxruntime,vision]
             - save_cache:
                   key: v0.4-onnx-{{ checksum "setup.py" }}
                   paths:
@@ -816,7 +816,7 @@ jobs:
                       - v0.4-torch-{{ checksum "setup.py" }}
                       - v0.4-{{ checksum "setup.py" }}
             - run: pip install --upgrade pip
-            - run: pip install .[torch,testing,sentencepiece,onnxruntime]
+            - run: pip install .[torch,testing,sentencepiece,onnxruntime,vision]
             - save_cache:
                   key: v0.4-onnx-{{ checksum "setup.py" }}
                   paths:

docs/source/serialization.mdx

@@ -62,6 +62,7 @@ Ready-made configurations include the following architectures:
 - PLBart
 - RoBERTa
 - T5
+- ViT
 - XLM-RoBERTa
 - XLM-RoBERTa-XL
 

src/transformers/models/bart/configuration_bart.py

@@ -358,13 +358,13 @@ class BartOnnxConfig(OnnxSeq2SeqConfigWithPast):
         # Did not use super(OnnxConfigWithPast, self).generate_dummy_inputs for code clarity.
         # If dynamic axis (-1) we forward with a fixed dimension of 2 samples to avoid optimizations made by ONNX
         batch_size = compute_effective_axis_dimension(
-            batch_size, fixed_dimension=OnnxConfig.DEFAULT_FIXED_BATCH, num_token_to_add=0
+            batch_size, fixed_dimension=OnnxConfig.default_fixed_batch, num_token_to_add=0
         )
 
         # If dynamic axis (-1) we forward with a fixed dimension of 8 tokens to avoid optimizations made by ONNX
         token_to_add = tokenizer.num_special_tokens_to_add(is_pair)
         seq_length = compute_effective_axis_dimension(
-            seq_length, fixed_dimension=OnnxConfig.DEFAULT_FIXED_SEQUENCE, num_token_to_add=token_to_add
+            seq_length, fixed_dimension=OnnxConfig.default_fixed_sequence, num_token_to_add=token_to_add
         )
 
         # Generate dummy inputs according to compute batch and sequence

src/transformers/models/marian/configuration_marian.py

@@ -346,13 +346,13 @@ class MarianOnnxConfig(OnnxSeq2SeqConfigWithPast):
         # Did not use super(OnnxConfigWithPast, self).generate_dummy_inputs for code clarity.
         # If dynamic axis (-1) we forward with a fixed dimension of 2 samples to avoid optimizations made by ONNX
         batch_size = compute_effective_axis_dimension(
-            batch_size, fixed_dimension=OnnxConfig.DEFAULT_FIXED_BATCH, num_token_to_add=0
+            batch_size, fixed_dimension=OnnxConfig.default_fixed_batch, num_token_to_add=0
         )
 
         # If dynamic axis (-1) we forward with a fixed dimension of 8 tokens to avoid optimizations made by ONNX
         token_to_add = tokenizer.num_special_tokens_to_add(is_pair)
         seq_length = compute_effective_axis_dimension(
-            seq_length, fixed_dimension=OnnxConfig.DEFAULT_FIXED_SEQUENCE, num_token_to_add=token_to_add
+            seq_length, fixed_dimension=OnnxConfig.default_fixed_sequence, num_token_to_add=token_to_add
         )
 
         # Generate dummy inputs according to compute batch and sequence

src/transformers/models/mbart/configuration_mbart.py

@@ -343,13 +343,13 @@ class MBartOnnxConfig(OnnxSeq2SeqConfigWithPast):
         # Did not use super(OnnxConfigWithPast, self).generate_dummy_inputs for code clarity.
         # If dynamic axis (-1) we forward with a fixed dimension of 2 samples to avoid optimizations made by ONNX
         batch_size = compute_effective_axis_dimension(
-            batch_size, fixed_dimension=OnnxConfig.DEFAULT_FIXED_BATCH, num_token_to_add=0
+            batch_size, fixed_dimension=OnnxConfig.default_fixed_batch, num_token_to_add=0
         )
 
         # If dynamic axis (-1) we forward with a fixed dimension of 8 tokens to avoid optimizations made by ONNX
         token_to_add = tokenizer.num_special_tokens_to_add(is_pair)
         seq_length = compute_effective_axis_dimension(
-            seq_length, fixed_dimension=OnnxConfig.DEFAULT_FIXED_SEQUENCE, num_token_to_add=token_to_add
+            seq_length, fixed_dimension=OnnxConfig.default_fixed_sequence, num_token_to_add=token_to_add
         )
 
         # Generate dummy inputs according to compute batch and sequence

src/transformers/models/vit/__init__.py

@@ -21,7 +21,7 @@ from ...file_utils import _LazyModule, is_flax_available, is_tf_available, is_to
 
 
 _import_structure = {
-    "configuration_vit": ["VIT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ViTConfig"],
+    "configuration_vit": ["VIT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ViTConfig", "ViTOnnxConfig"],
 }
 
 if is_vision_available():
@@ -51,7 +51,7 @@ if is_flax_available():
     ]
 
 if TYPE_CHECKING:
-    from .configuration_vit import VIT_PRETRAINED_CONFIG_ARCHIVE_MAP, ViTConfig
+    from .configuration_vit import VIT_PRETRAINED_CONFIG_ARCHIVE_MAP, ViTConfig, ViTOnnxConfig
 
     if is_vision_available():
         from .feature_extraction_vit import ViTFeatureExtractor

src/transformers/models/vit/configuration_vit.py

@@ -14,7 +14,13 @@
 # limitations under the License.
 """ ViT model configuration"""
 
+from collections import OrderedDict
+from typing import Mapping
+
+from packaging import version
+
 from ...configuration_utils import PretrainedConfig
+from ...onnx import OnnxConfig
 from ...utils import logging
 
 
@@ -119,3 +125,20 @@ class ViTConfig(PretrainedConfig):
         self.num_channels = num_channels
         self.qkv_bias = qkv_bias
         self.encoder_stride = encoder_stride
+
+
+class ViTOnnxConfig(OnnxConfig):
+
+    torch_onnx_minimum_version = version.parse("1.11")
+
+    @property
+    def inputs(self) -> Mapping[str, Mapping[int, str]]:
+        return OrderedDict(
+            [
+                ("pixel_values", {0: "batch", 1: "sequence"}),
+            ]
+        )
+
+    @property
+    def atol_for_validation(self) -> float:
+        return 1e-4

src/transformers/onnx/__main__.py

@@ -15,8 +15,9 @@
 from argparse import ArgumentParser
 from pathlib import Path
 
-from transformers.models.auto import AutoTokenizer
-
+from ..models.auto import AutoConfig, AutoFeatureExtractor, AutoTokenizer
+from ..models.auto.feature_extraction_auto import FEATURE_EXTRACTOR_MAPPING_NAMES
+from ..models.auto.tokenization_auto import TOKENIZER_MAPPING_NAMES
 from ..utils import logging
 from .convert import export, validate_model_outputs
 from .features import FeaturesManager
@@ -46,8 +47,17 @@ def main():
     if not args.output.parent.exists():
         args.output.parent.mkdir(parents=True)
 
+    # Check the modality of the inputs and instantiate the appropriate preprocessor
+    # TODO(lewtun): Refactor this as a function if we need to check modalities elsewhere as well
+    config = AutoConfig.from_pretrained(args.model)
+    if config.model_type in TOKENIZER_MAPPING_NAMES:
+        preprocessor = AutoTokenizer.from_pretrained(args.model)
+    elif config.model_type in FEATURE_EXTRACTOR_MAPPING_NAMES:
+        preprocessor = AutoFeatureExtractor.from_pretrained(args.model)
+    else:
+        raise ValueError(f"Unsupported model type: {config.model_type}")
+
     # Allocate the model
-    tokenizer = AutoTokenizer.from_pretrained(args.model)
     model = FeaturesManager.get_model_from_feature(args.feature, args.model)
     model_kind, model_onnx_config = FeaturesManager.check_supported_model_or_raise(model, feature=args.feature)
     onnx_config = model_onnx_config(model.config)
@@ -62,12 +72,18 @@ def main():
             f"At least  {onnx_config.default_onnx_opset} is required."
         )
 
-    onnx_inputs, onnx_outputs = export(tokenizer, model, onnx_config, args.opset, args.output)
+    onnx_inputs, onnx_outputs = export(
+        preprocessor,
+        model,
+        onnx_config,
+        args.opset,
+        args.output,
+    )
 
     if args.atol is None:
         args.atol = onnx_config.atol_for_validation
 
-    validate_model_outputs(onnx_config, tokenizer, model, args.output, onnx_outputs, args.atol)
+    validate_model_outputs(onnx_config, preprocessor, model, args.output, onnx_outputs, args.atol)
     logger.info(f"All good, model saved at: {args.output.as_posix()}")
 
 

src/transformers/onnx/config.py

@@ -13,15 +13,31 @@
 # limitations under the License.
 import copy
 import dataclasses
+import warnings
 from abc import ABC, abstractmethod
 from collections import OrderedDict
-from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Callable, Dict, Iterable, List, Mapping, Optional, Tuple, Union
 
-from transformers import PretrainedConfig, PreTrainedTokenizer, TensorType, is_torch_available
+import numpy as np
+from packaging import version
 
+from ..file_utils import TensorType, is_torch_available, is_vision_available
+from ..utils import logging
 from .utils import ParameterFormat, compute_effective_axis_dimension, compute_serialized_parameters_size
 
 
+if TYPE_CHECKING:
+    from ..configuration_utils import PretrainedConfig
+    from ..feature_extraction_utils import FeatureExtractionMixin
+    from ..tokenization_utils_base import PreTrainedTokenizerBase
+
+
+if is_vision_available():
+    from PIL import Image
+
+logger = logging.get_logger(__name__)
+
+
 DEFAULT_ONNX_OPSET = 11
 
 # 2 Gb
@@ -54,10 +70,10 @@ class OnnxConfig(ABC):
     Base class for ONNX exportable model describing metadata on how to export the model through the ONNX format.
     """
 
-    DEFAULT_FIXED_BATCH = 2
-    DEFAULT_FIXED_SEQUENCE = 8
-
-    _TASKS_TO_COMMON_OUTPUTS = {
+    default_fixed_batch = 2
+    default_fixed_sequence = 8
+    torch_onnx_minimum_version = version.parse("1.8")
+    _tasks_to_common_outputs = {
         "default": OrderedDict({"last_hidden_state": {0: "batch", 1: "sequence"}}),
         "masked-lm": OrderedDict({"logits": {0: "batch", 1: "sequence"}}),
         "causal-lm": OrderedDict({"logits": {0: "batch", 1: "sequence"}}),
@@ -71,14 +87,15 @@ class OnnxConfig(ABC):
                 "end_logits": {0: "batch", 1: "sequence"},
             }
         ),
+        "image-classification": OrderedDict({"logits": {0: "batch", 1: "sequence"}}),
     }
 
-    def __init__(self, config: PretrainedConfig, task: str = "default", patching_specs: List[PatchingSpec] = None):
+    def __init__(self, config: "PretrainedConfig", task: str = "default", patching_specs: List[PatchingSpec] = None):
         self._config = config
 
-        if task not in self._TASKS_TO_COMMON_OUTPUTS:
+        if task not in self._tasks_to_common_outputs:
             raise ValueError(
-                f"{task} is not a supported task, supported tasks: {self._TASKS_TO_COMMON_OUTPUTS.keys()}"
+                f"{task} is not a supported task, supported tasks: {self._tasks_to_common_outputs.keys()}"
             )
         self.task = task
 
@@ -90,7 +107,7 @@ class OnnxConfig(ABC):
             self._patching_specs.append(final_spec)
 
     @classmethod
-    def from_model_config(cls, config: PretrainedConfig, task: str = "default") -> "OnnxConfig":
+    def from_model_config(cls, config: "PretrainedConfig", task: str = "default") -> "OnnxConfig":
         """
         Instantiate a OnnxConfig for a specific model
 
@@ -121,7 +138,7 @@ class OnnxConfig(ABC):
         Returns:
             For each output: its name associated to the axes symbolic name and the axis position within the tensor
         """
-        common_outputs = self._TASKS_TO_COMMON_OUTPUTS[self.task]
+        common_outputs = self._tasks_to_common_outputs[self.task]
         return copy.deepcopy(common_outputs)
 
     @property
@@ -146,7 +163,7 @@ class OnnxConfig(ABC):
             Integer > 0
         """
         # Using 2 avoid ONNX making assumption about single sample batch
-        return OnnxConfig.DEFAULT_FIXED_BATCH
+        return OnnxConfig.default_fixed_batch
 
     @property
     def default_sequence_length(self) -> int:
@@ -156,7 +173,7 @@ class OnnxConfig(ABC):
         Returns:
             Integer > 0
         """
-        return OnnxConfig.DEFAULT_FIXED_SEQUENCE
+        return OnnxConfig.default_fixed_sequence
 
     @property
     def default_onnx_opset(self) -> int:
@@ -178,6 +195,21 @@ class OnnxConfig(ABC):
         """
         return 1e-5
 
+    @property
+    def is_torch_support_available(self) -> bool:
+        """
+        The minimum PyTorch version required to export the model.
+
+        Returns:
+            `bool`: Whether the installed version of PyTorch is compatible with the model.
+        """
+        if is_torch_available():
+            from transformers.file_utils import torch_version
+
+            return torch_version >= self.torch_onnx_minimum_version
+        else:
+            return False
+
     @staticmethod
     def use_external_data_format(num_parameters: int) -> bool:
         """
@@ -195,42 +227,85 @@ class OnnxConfig(ABC):
             >= EXTERNAL_DATA_FORMAT_SIZE_LIMIT
         )
 
+    def _generate_dummy_images(
+        self, batch_size: int = 2, num_channels: int = 3, image_height: int = 40, image_width: int = 40
+    ):
+        images = []
+        for _ in range(batch_size):
+            data = np.random.rand(image_height, image_width, num_channels) * 255
+            images.append(Image.fromarray(data.astype("uint8")).convert("RGB"))
+        return images
+
     def generate_dummy_inputs(
         self,
-        tokenizer: PreTrainedTokenizer,
+        preprocessor: Union["PreTrainedTokenizerBase", "FeatureExtractionMixin"],
         batch_size: int = -1,
         seq_length: int = -1,
         is_pair: bool = False,
         framework: Optional[TensorType] = None,
+        num_channels: int = 3,
+        image_width: int = 40,
+        image_height: int = 40,
+        tokenizer: "PreTrainedTokenizerBase" = None,
     ) -> Mapping[str, Any]:
         """
         Generate inputs to provide to the ONNX exporter for the specific framework
 
         Args:
-            tokenizer: The tokenizer associated with this model configuration
-            batch_size: The batch size (int) to export the model for (-1 means dynamic axis)
-            seq_length: The sequence length (int) to export the model for (-1 means dynamic axis)
-            is_pair: Indicate if the input is a pair (sentence 1, sentence 2)
-            framework: The framework (optional) the tokenizer will generate tensor for
+            preprocessor: ([`PreTrainedTokenizerBase`] or [`FeatureExtractionMixin`]):
+                The preprocessor associated with this model configuration.
+            batch_size (`int`, *optional*, defaults to -1):
+                The batch size to export the model for (-1 means dynamic axis).
+            seq_length (`int`, *optional*, defaults to -1):
+                The sequence length to export the model for (-1 means dynamic axis).
+            is_pair (`bool`, *optional*, defaults to `False`):
+                Indicate if the input is a pair (sentence 1, sentence 2)
+            framework (`TensorType`, *optional*, defaults to `None`):
+                The framework (PyTorch or TensorFlow) that the tokenizer will generate tensors for.
+            num_channels (`int`, *optional*, defaults to 3):
+                The number of channels of the generated images.
+            image_width (`int`, *optional*, defaults to 40):
+                The width of the generated images.
+            image_height (`int`, *optional*, defaults to 40):
+                The height of the generated images.
 
         Returns:
             Mapping[str, Tensor] holding the kwargs to provide to the model's forward function
         """
+        from ..feature_extraction_utils import FeatureExtractionMixin
+        from ..tokenization_utils_base import PreTrainedTokenizerBase
 
+        if isinstance(preprocessor, PreTrainedTokenizerBase) and tokenizer is not None:
+            raise ValueError("You cannot provide both a tokenizer and a preprocessor to generate dummy inputs.")
+        if tokenizer is not None:
+            warnings.warn(
+                "The `tokenizer` argument is deprecated and will be removed in version 5 of Transformers. Use `preprocessor` instead.",
+                FutureWarning,
+            )
+            logger.warning("Overwriting the `preprocessor` argument with `tokenizer` to generate dummmy inputs.")
+            preprocessor = tokenizer
+        if isinstance(preprocessor, PreTrainedTokenizerBase):
             # If dynamic axis (-1) we forward with a fixed dimension of 2 samples to avoid optimizations made by ONNX
             batch_size = compute_effective_axis_dimension(
-            batch_size, fixed_dimension=OnnxConfig.DEFAULT_FIXED_BATCH, num_token_to_add=0
+                batch_size, fixed_dimension=OnnxConfig.default_fixed_batch, num_token_to_add=0
             )
-
             # If dynamic axis (-1) we forward with a fixed dimension of 8 tokens to avoid optimizations made by ONNX
-        token_to_add = tokenizer.num_special_tokens_to_add(is_pair)
+            token_to_add = preprocessor.num_special_tokens_to_add(is_pair)
             seq_length = compute_effective_axis_dimension(
-            seq_length, fixed_dimension=OnnxConfig.DEFAULT_FIXED_SEQUENCE, num_token_to_add=token_to_add
+                seq_length, fixed_dimension=OnnxConfig.default_fixed_sequence, num_token_to_add=token_to_add
             )
-
             # Generate dummy inputs according to compute batch and sequence
-        dummy_input = [" ".join([tokenizer.unk_token]) * seq_length] * batch_size
-        return dict(tokenizer(dummy_input, return_tensors=framework))
+            dummy_input = [" ".join([preprocessor.unk_token]) * seq_length] * batch_size
+            return dict(preprocessor(dummy_input, return_tensors=framework))
+        elif isinstance(preprocessor, FeatureExtractionMixin) and preprocessor.model_input_names[0] == "pixel_values":
+            # If dynamic axis (-1) we forward with a fixed dimension of 2 samples to avoid optimizations made by ONNX
+            batch_size = compute_effective_axis_dimension(batch_size, fixed_dimension=OnnxConfig.default_fixed_batch)
+            dummy_input = self._generate_dummy_images(batch_size, num_channels, image_height, image_width)
+            return dict(preprocessor(images=dummy_input, return_tensors=framework))
+        else:
+            raise ValueError(
+                "Unable to generate dummy inputs for the model. Please provide a tokenizer or a preprocessor."
+            )
 
     def patch_ops(self):
         for spec in self._patching_specs:
@@ -264,7 +339,7 @@ class OnnxConfig(ABC):
 class OnnxConfigWithPast(OnnxConfig, ABC):
     def __init__(
         self,
-        config: PretrainedConfig,
+        config: "PretrainedConfig",
         task: str = "default",
         patching_specs: List[PatchingSpec] = None,
         use_past: bool = False,
@@ -273,7 +348,7 @@ class OnnxConfigWithPast(OnnxConfig, ABC):
         self.use_past = use_past
 
     @classmethod
-    def with_past(cls, config: PretrainedConfig, task: str = "default") -> "OnnxConfigWithPast":
+    def with_past(cls, config: "PretrainedConfig", task: str = "default") -> "OnnxConfigWithPast":
         """
         Instantiate a OnnxConfig with `use_past` attribute set to True
 
@@ -326,7 +401,7 @@ class OnnxConfigWithPast(OnnxConfig, ABC):
 
     def generate_dummy_inputs(
         self,
-        tokenizer: PreTrainedTokenizer,
+        tokenizer: "PreTrainedTokenizerBase",
         batch_size: int = -1,
         seq_length: int = -1,
         is_pair: bool = False,
@@ -445,7 +520,7 @@ class OnnxSeq2SeqConfigWithPast(OnnxConfigWithPast):
 
     def generate_dummy_inputs(
         self,
-        tokenizer: PreTrainedTokenizer,
+        tokenizer: "PreTrainedTokenizerBase",
         batch_size: int = -1,
         seq_length: int = -1,
         is_pair: bool = False,

src/transformers/onnx/convert.py

@@ -12,18 +12,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import warnings
 from inspect import signature
 from itertools import chain
 from pathlib import Path
-from typing import Iterable, List, Tuple, Union
+from typing import TYPE_CHECKING, Iterable, List, Tuple, Union
 
 import numpy as np
 from packaging.version import Version, parse
 
-from transformers import PreTrainedModel, PreTrainedTokenizer, TensorType, TFPreTrainedModel, is_torch_available
-from transformers.file_utils import is_tf_available, is_torch_onnx_dict_inputs_support_available
-from transformers.onnx.config import OnnxConfig
-from transformers.utils import logging
+from ..file_utils import TensorType, is_tf_available, is_torch_available, is_torch_onnx_dict_inputs_support_available
+from ..utils import logging
+from .config import OnnxConfig
+
+
+if is_torch_available():
+    from ..modeling_utils import PreTrainedModel
+
+if is_tf_available():
+    from ..modeling_tf_utils import TFPreTrainedModel
+
+if TYPE_CHECKING:
+    from ..feature_extraction_utils import FeatureExtractionMixin
+    from ..tokenization_utils import PreTrainedTokenizer
 
 
 logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
@@ -63,18 +74,19 @@ def check_onnxruntime_requirements(minimum_version: Version):
 
 
 def export_pytorch(
-    tokenizer: PreTrainedTokenizer,
-    model: PreTrainedModel,
+    preprocessor: Union["PreTrainedTokenizer", "FeatureExtractionMixin"],
+    model: "PreTrainedModel",
     config: OnnxConfig,
     opset: int,
     output: Path,
+    tokenizer: "PreTrainedTokenizer" = None,
 ) -> Tuple[List[str], List[str]]:
     """
     Export a PyTorch model to an ONNX Intermediate Representation (IR)
 
     Args:
-        tokenizer ([`PreTrainedTokenizer`]):
-            The tokenizer used for encoding the data.
+        preprocessor: ([`PreTrainedTokenizer`] or [`FeatureExtractionMixin`]):
+            The preprocessor used for encoding the data.
         model ([`PreTrainedModel`]):
             The model to export.
         config ([`~onnx.config.OnnxConfig`]):
@@ -88,6 +100,11 @@ def export_pytorch(
         `Tuple[List[str], List[str]]`: A tuple with an ordered list of the model's inputs, and the named inputs from
         the ONNX configuration.
     """
+    if tokenizer is not None:
+        warnings.warn(
+            "The `tokenizer` argument is deprecated and will be removed in version 5 of Transformers. Use `preprocessor` instead.",
+            FutureWarning,
+        )
     if issubclass(type(model), PreTrainedModel):
         import torch
         from torch.onnx import export as onnx_export
@@ -106,7 +123,9 @@ def export_pytorch(
 
             # Ensure inputs match
             # TODO: Check when exporting QA we provide "is_pair=True"
-            model_inputs = config.generate_dummy_inputs(tokenizer, framework=TensorType.PYTORCH)
+            model_inputs = config.generate_dummy_inputs(
+                preprocessor, tokenizer=tokenizer, framework=TensorType.PYTORCH
+            )
             inputs_match, matched_inputs = ensure_model_and_config_inputs_match(model, model_inputs.keys())
             onnx_outputs = list(config.outputs.keys())
 
@@ -163,18 +182,19 @@ def export_pytorch(
 
 
 def export_tensorflow(
-    tokenizer: PreTrainedTokenizer,
-    model: TFPreTrainedModel,
+    preprocessor: Union["PreTrainedTokenizer", "FeatureExtractionMixin"],
+    model: "TFPreTrainedModel",
     config: OnnxConfig,
     opset: int,
     output: Path,
+    tokenizer: "PreTrainedTokenizer" = None,
 ) -> Tuple[List[str], List[str]]:
     """
     Export a TensorFlow model to an ONNX Intermediate Representation (IR)
 
     Args:
-        tokenizer ([`PreTrainedTokenizer`]):
-            The tokenizer used for encoding the data.
+        preprocessor: ([`PreTrainedTokenizer`] or [`FeatureExtractionMixin`]):
+            The preprocessor used for encoding the data.
         model ([`TFPreTrainedModel`]):
             The model to export.
         config ([`~onnx.config.OnnxConfig`]):
@@ -193,6 +213,12 @@ def export_tensorflow(
     import onnx
     import tf2onnx
 
+    if tokenizer is not None:
+        warnings.warn(
+            "The `tokenizer` argument is deprecated and will be removed in version 5 of Transformers. Use `preprocessor` instead.",
+            FutureWarning,
+        )
+
     model.config.return_dict = True
 
     # Check if we need to override certain configuration item
@@ -203,7 +229,7 @@ def export_tensorflow(
             setattr(model.config, override_config_key, override_config_value)
 
     # Ensure inputs match
-    model_inputs = config.generate_dummy_inputs(tokenizer, framework=TensorType.TENSORFLOW)
+    model_inputs = config.generate_dummy_inputs(preprocessor, tokenizer=tokenizer, framework=TensorType.TENSORFLOW)
     inputs_match, matched_inputs = ensure_model_and_config_inputs_match(model, model_inputs.keys())
     onnx_outputs = list(config.outputs.keys())
 
@@ -216,18 +242,19 @@ def export_tensorflow(
 
 
 def export(
-    tokenizer: PreTrainedTokenizer,
-    model: Union[PreTrainedModel, TFPreTrainedModel],
+    preprocessor: Union["PreTrainedTokenizer", "FeatureExtractionMixin"],
+    model: Union["PreTrainedModel", "TFPreTrainedModel"],
     config: OnnxConfig,
     opset: int,
     output: Path,
+    tokenizer: "PreTrainedTokenizer" = None,
 ) -> Tuple[List[str], List[str]]:
     """
     Export a Pytorch or TensorFlow model to an ONNX Intermediate Representation (IR)
 
     Args:
-        tokenizer ([`PreTrainedTokenizer`]):
-            The tokenizer used for encoding the data.
+        preprocessor: ([`PreTrainedTokenizer`] or [`FeatureExtractionMixin`]):
+            The preprocessor used for encoding the data.
         model ([`PreTrainedModel`] or [`TFPreTrainedModel`]):
             The model to export.
         config ([`~onnx.config.OnnxConfig`]):
@@ -246,26 +273,37 @@ def export(
             "Cannot convert because neither PyTorch nor TensorFlow are not installed. "
             "Please install torch or tensorflow first."
         )
+    if tokenizer is not None:
+        warnings.warn(
+            "The `tokenizer` argument is deprecated and will be removed in version 5 of Transformers. Use `preprocessor` instead.",
+            FutureWarning,
+        )
 
     if is_torch_available():
-        from transformers.file_utils import torch_version
+        from ..file_utils import torch_version
 
         if not is_torch_onnx_dict_inputs_support_available():
             raise AssertionError(f"Unsupported PyTorch version, minimum required is 1.8.0, got: {torch_version}")
 
+        if not config.is_torch_support_available:
+            logger.warning(
+                f"Unsupported PyTorch version for this model. Minimum required is {config.torch_onnx_minimum_version}, got: {torch_version}"
+            )
+
     if is_torch_available() and issubclass(type(model), PreTrainedModel):
-        return export_pytorch(tokenizer, model, config, opset, output)
+        return export_pytorch(preprocessor, model, config, opset, output, tokenizer=tokenizer)
     elif is_tf_available() and issubclass(type(model), TFPreTrainedModel):
-        return export_tensorflow(tokenizer, model, config, opset, output)
+        return export_tensorflow(preprocessor, model, config, opset, output, tokenizer=tokenizer)
 
 
 def validate_model_outputs(
     config: OnnxConfig,
-    tokenizer: PreTrainedTokenizer,
-    reference_model: Union[PreTrainedModel, TFPreTrainedModel],
+    preprocessor: Union["PreTrainedTokenizer", "FeatureExtractionMixin"],
+    reference_model: Union["PreTrainedModel", "TFPreTrainedModel"],
     onnx_model: Path,
     onnx_named_outputs: List[str],
     atol: float,
+    tokenizer: "PreTrainedTokenizer" = None,
 ):
     from onnxruntime import InferenceSession, SessionOptions
 
@@ -274,9 +312,13 @@ def validate_model_outputs(
     # TODO: generate inputs with a different batch_size and seq_len that was used for conversion to properly test
     # dynamic input shapes.
     if issubclass(type(reference_model), PreTrainedModel):
-        reference_model_inputs = config.generate_dummy_inputs(tokenizer, framework=TensorType.PYTORCH)
+        reference_model_inputs = config.generate_dummy_inputs(
+            preprocessor, tokenizer=tokenizer, framework=TensorType.PYTORCH
+        )
     else:
-        reference_model_inputs = config.generate_dummy_inputs(tokenizer, framework=TensorType.TENSORFLOW)
+        reference_model_inputs = config.generate_dummy_inputs(
+            preprocessor, tokenizer=tokenizer, framework=TensorType.TENSORFLOW
+        )
 
     # Create ONNX Runtime session
     options = SessionOptions()
@@ -354,7 +396,7 @@ def validate_model_outputs(
 
 
 def ensure_model_and_config_inputs_match(
-    model: Union[PreTrainedModel, TFPreTrainedModel], model_inputs: Iterable[str]
+    model: Union["PreTrainedModel", "TFPreTrainedModel"], model_inputs: Iterable[str]
 ) -> Tuple[bool, List[str]]:
     """
 

src/transformers/onnx/features.py

@@ -17,6 +17,7 @@ from ..models.marian import MarianOnnxConfig
 from ..models.mbart import MBartOnnxConfig
 from ..models.roberta import RobertaOnnxConfig
 from ..models.t5 import T5OnnxConfig
+from ..models.vit import ViTOnnxConfig
 from ..models.xlm_roberta import XLMRobertaOnnxConfig
 from ..utils import logging
 from .config import OnnxConfig
@@ -28,6 +29,7 @@ if is_torch_available():
     from transformers.models.auto import (
         AutoModel,
         AutoModelForCausalLM,
+        AutoModelForImageClassification,
         AutoModelForMaskedLM,
         AutoModelForMultipleChoice,
         AutoModelForQuestionAnswering,
@@ -90,6 +92,7 @@ class FeaturesManager:
             "token-classification": AutoModelForTokenClassification,
             "multiple-choice": AutoModelForMultipleChoice,
             "question-answering": AutoModelForQuestionAnswering,
+            "image-classification": AutoModelForImageClassification,
         }
     elif is_tf_available():
         _TASKS_TO_AUTOMODELS = {
@@ -244,6 +247,7 @@ class FeaturesManager:
             "question-answering",
             onnx_config_cls=ElectraOnnxConfig,
         ),
+        "vit": supported_features_mapping("default", "image-classification", onnx_config_cls=ViTOnnxConfig),
     }
 
     AVAILABLE_FEATURES = sorted(reduce(lambda s1, s2: s1 | s2, (v.keys() for v in _SUPPORTED_MODEL_TYPE.values())))

tests/onnx/test_onnx_v2.py

@@ -3,23 +3,25 @@ from tempfile import NamedTemporaryFile
 from unittest import TestCase
 from unittest.mock import patch
 
+import pytest
+
 from parameterized import parameterized
-from transformers import AutoConfig, AutoTokenizer, is_tf_available, is_torch_available
+from transformers import AutoConfig, AutoFeatureExtractor, AutoTokenizer, is_tf_available, is_torch_available
 from transformers.onnx import (
     EXTERNAL_DATA_FORMAT_SIZE_LIMIT,
     OnnxConfig,
+    OnnxConfigWithPast,
     ParameterFormat,
     export,
     validate_model_outputs,
 )
-from transformers.onnx.config import OnnxConfigWithPast
 
 
 if is_torch_available() or is_tf_available():
     from transformers.onnx.features import FeaturesManager
 
 from transformers.onnx.utils import compute_effective_axis_dimension, compute_serialized_parameters_size
-from transformers.testing_utils import require_onnx, require_tf, require_torch, slow
+from transformers.testing_utils import require_onnx, require_tf, require_torch, require_vision, slow
 
 
 @require_onnx
@@ -178,6 +180,7 @@ PYTORCH_EXPORT_MODELS = {
     ("roberta", "roberta-base"),
     ("xlm-roberta", "xlm-roberta-base"),
     ("layoutlm", "microsoft/layoutlm-base-uncased"),
+    ("vit", "google/vit-base-patch16-224"),
 }
 
 PYTORCH_EXPORT_WITH_PAST_MODELS = {
@@ -241,25 +244,38 @@ class OnnxExportTestCaseV2(TestCase):
     def _onnx_export(self, test_name, name, model_name, feature, onnx_config_class_constructor):
         from transformers.onnx import export
 
-        tokenizer = AutoTokenizer.from_pretrained(model_name)
-        config = AutoConfig.from_pretrained(model_name)
-
-        # Useful for causal lm models that do not use pad tokens.
-        if not getattr(config, "pad_token_id", None):
-            config.pad_token_id = tokenizer.eos_token_id
-
         model_class = FeaturesManager.get_model_class_for_feature(feature)
+        config = AutoConfig.from_pretrained(model_name)
         model = model_class.from_config(config)
         onnx_config = onnx_config_class_constructor(model.config)
 
+        if is_torch_available():
+            from transformers.file_utils import torch_version
+
+            if torch_version < onnx_config.torch_onnx_minimum_version:
+                pytest.skip(
+                    f"Skipping due to incompatible PyTorch version. Minimum required is {onnx_config.torch_onnx_minimum_version}, got: {torch_version}"
+                )
+
+        # Check the modality of the inputs and instantiate the appropriate preprocessor
+        if model.main_input_name == "input_ids":
+            preprocessor = AutoTokenizer.from_pretrained(model_name)
+            # Useful for causal lm models that do not use pad tokens.
+            if not getattr(config, "pad_token_id", None):
+                config.pad_token_id = preprocessor.eos_token_id
+        elif model.main_input_name == "pixel_values":
+            preprocessor = AutoFeatureExtractor.from_pretrained(model_name)
+        else:
+            raise ValueError(f"Unsupported model input name: {model.main_input_name}")
+
         with NamedTemporaryFile("w") as output:
             try:
                 onnx_inputs, onnx_outputs = export(
-                    tokenizer, model, onnx_config, onnx_config.default_onnx_opset, Path(output.name)
+                    preprocessor, model, onnx_config, onnx_config.default_onnx_opset, Path(output.name)
                 )
                 validate_model_outputs(
                     onnx_config,
-                    tokenizer,
+                    preprocessor,
                     model,
                     Path(output.name),
                     onnx_outputs,
@@ -271,6 +287,7 @@ class OnnxExportTestCaseV2(TestCase):
     @parameterized.expand(_get_models_to_test(PYTORCH_EXPORT_MODELS))
     @slow
     @require_torch
+    @require_vision
     def test_pytorch_export(self, test_name, name, model_name, feature, onnx_config_class_constructor):
         self._onnx_export(test_name, name, model_name, feature, onnx_config_class_constructor)
 
@@ -291,6 +308,7 @@ class OnnxExportTestCaseV2(TestCase):
     @parameterized.expand(_get_models_to_test(TENSORFLOW_EXPORT_DEFAULT_MODELS))
     @slow
     @require_tf
+    @require_vision
     def test_tensorflow_export(self, test_name, name, model_name, feature, onnx_config_class_constructor):
         self._onnx_export(test_name, name, model_name, feature, onnx_config_class_constructor)