Add Swinv2 backbone (#27742)

* First draft

* More improvements

* More improvements

* Make all tests pass

* Remove script

* Update image processor

* Address comments

* Use new gradient checkpointing method

* Convert checkpoints, add integration test

* Do not keep aspect ratio for now

* Set keep_aspect_ratio=False for beit, add integration test

* Remove print statement

tests/models/dpt/test_image_processing_dpt.py

@@ -126,3 +126,13 @@ class DPTImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
         ).pixel_values
         self.assertTrue(pixel_values.shape[2] % 4 == 0)
         self.assertTrue(pixel_values.shape[3] % 4 == 0)
+
+    def test_keep_aspect_ratio(self):
+        size = {"height": 512, "width": 512}
+        image_processor = DPTImageProcessor(size=size, keep_aspect_ratio=True, ensure_multiple_of=32)
+
+        image = np.zeros((489, 640, 3))
+
+        pixel_values = image_processor(image, return_tensors="pt").pixel_values
+
+        self.assertEqual(list(pixel_values.shape), [1, 3, 512, 672])