Object detection pipeline (#12886)

* Implement object-detection pipeline

* Define threshold const

* Add `threshold` argument

* Refactor

* Uncomment test inputs

* `rm

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* Fix typo

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* Fix typo

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* Chore better doc

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* Rm unnecessary lines

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* Chore better naming

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* Update src/transformers/pipelines/object_detection.py

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* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Fix typo

* Add `detr-tiny` for tests

* Add `ObjectDetectionPipeline` to `trnsfrmrs/init`

* Implement new bbox format

* Update detr post_process

* Update `load_img` method obj det pipeline

* make style

* Implement new testing format for obj det pipeln

* Add guard pytorch specific code in pipeline

* Add doc

* Make pipeline_obj_tet tests deterministic

* Revert some changes to `post_process` COCO api

* Chore

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Update src/transformers/pipelines/object_detection.py

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Rm timm requirement

* make fixup

* Add timm requirement to test

* Make fixup

* Guard torch.Tensor

* Chore

* Delete unnecessary comment

Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

docs/source/main_classes/pipelines.rst

@@ -29,6 +29,7 @@ There are two categories of pipeline abstractions to be aware about:
     - :class:`~transformers.FeatureExtractionPipeline`
     - :class:`~transformers.FillMaskPipeline`
     - :class:`~transformers.ImageClassificationPipeline`
+    - :class:`~transformers.ObjectDetectionPipeline`
     - :class:`~transformers.QuestionAnsweringPipeline`
     - :class:`~transformers.SummarizationPipeline`
     - :class:`~transformers.TableQuestionAnsweringPipeline`
@@ -102,6 +103,13 @@ NerPipeline
 
 See :class:`~transformers.TokenClassificationPipeline` for all details.
 
+ObjectDetectionPipeline
+=======================================================================================================================
+
+.. autoclass:: transformers.ObjectDetectionPipeline
+    :special-members: __call__
+    :members:
+
 QuestionAnsweringPipeline
 =======================================================================================================================