Add Onnx Config for ImageGPT (#19868)

* add Onnx Config for ImageGPT

* add generate_dummy_inputs for onnx config

* add TYPE_CHECKING clause

* Update doc for generate_dummy_inputs
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

docs/source/en/serialization.mdx

@@ -74,6 +74,7 @@ Ready-made configurations include the following architectures:
 - GPT-J
 - GroupViT
 - I-BERT
+- ImageGPT
 - LayoutLM
 - LayoutLMv3
 - LeViT

src/transformers/models/imagegpt/__init__.py

@@ -21,7 +21,9 @@ from typing import TYPE_CHECKING
 from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available, is_vision_available
 
 
-_import_structure = {"configuration_imagegpt": ["IMAGEGPT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ImageGPTConfig"]}
+_import_structure = {
+    "configuration_imagegpt": ["IMAGEGPT_PRETRAINED_CONFIG_ARCHIVE_MAP", "ImageGPTConfig", "ImageGPTOnnxConfig"]
+}
 
 try:
     if not is_vision_available():
@@ -48,7 +50,7 @@ else:
 
 
 if TYPE_CHECKING:
-    from .configuration_imagegpt import IMAGEGPT_PRETRAINED_CONFIG_ARCHIVE_MAP, ImageGPTConfig
+    from .configuration_imagegpt import IMAGEGPT_PRETRAINED_CONFIG_ARCHIVE_MAP, ImageGPTConfig, ImageGPTOnnxConfig
 
     try:
         if not is_vision_available():

src/transformers/models/imagegpt/configuration_imagegpt.py

@@ -14,10 +14,17 @@
 # limitations under the License.
 """ OpenAI ImageGPT configuration"""
 
+from collections import OrderedDict
+from typing import TYPE_CHECKING, Any, Mapping, Optional
+
 from ...configuration_utils import PretrainedConfig
+from ...onnx import OnnxConfig
 from ...utils import logging
 
 
+if TYPE_CHECKING:
+    from ... import FeatureExtractionMixin, TensorType
+
 logger = logging.get_logger(__name__)
 
 IMAGEGPT_PRETRAINED_CONFIG_ARCHIVE_MAP = {
@@ -140,3 +147,56 @@ class ImageGPTConfig(PretrainedConfig):
         self.tie_word_embeddings = tie_word_embeddings
 
         super().__init__(tie_word_embeddings=tie_word_embeddings, **kwargs)
+
+
+class ImageGPTOnnxConfig(OnnxConfig):
+    @property
+    def inputs(self) -> Mapping[str, Mapping[int, str]]:
+        return OrderedDict(
+            [
+                ("input_ids", {0: "batch", 1: "sequence"}),
+            ]
+        )
+
+    def generate_dummy_inputs(
+        self,
+        preprocessor: "FeatureExtractionMixin",
+        batch_size: int = 1,
+        seq_length: int = -1,
+        is_pair: bool = False,
+        framework: Optional["TensorType"] = None,
+        num_channels: int = 3,
+        image_width: int = 32,
+        image_height: int = 32,
+    ) -> Mapping[str, Any]:
+        """
+        Generate inputs to provide to the ONNX exporter for the specific framework
+
+        Args:
+            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).
+            num_choices (`int`, *optional*, defaults to -1):
+                The number of candidate answers provided for multiple choice task (-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
+        """
+
+        input_image = self._generate_dummy_images(batch_size, num_channels, image_height, image_width)
+        inputs = dict(preprocessor(input_image, framework))
+
+        return inputs

src/transformers/onnx/features.py

@@ -341,6 +341,9 @@ class FeaturesManager:
             "question-answering",
             onnx_config_cls="models.ibert.IBertOnnxConfig",
         ),
+        "imagegpt": supported_features_mapping(
+            "default", "image-classification", onnx_config_cls="models.imagegpt.ImageGPTOnnxConfig"
+        ),
         "layoutlm": supported_features_mapping(
             "default",
             "masked-lm",

tests/onnx/test_onnx_v2.py

@@ -193,6 +193,7 @@ PYTORCH_EXPORT_MODELS = {
     ("detr", "facebook/detr-resnet-50"),
     ("distilbert", "distilbert-base-cased"),
     ("electra", "google/electra-base-generator"),
+    ("imagegpt", "openai/imagegpt-small"),
     ("resnet", "microsoft/resnet-50"),
     ("roberta", "roberta-base"),
     ("roformer", "junnyu/roformer_chinese_base"),