Enable dynamic resolution input for Beit (#31053)

* Initial attempt

* Updates: PR suggestions

* Interpolate the relative position bias when interpolate_pos_encoding is True

* Add slow tag for the added tests

* Add in DATA2VEC_VISION_INPUTS_DOCSTRING

tests/models/beit/test_modeling_beit.py

@@ -545,6 +545,31 @@ class BeitModelIntegrationTest(unittest.TestCase):
         expected_shape = torch.Size((160, 160))
         self.assertEqual(segmentation[0].shape, expected_shape)
 
+    @slow
+    def test_inference_interpolate_pos_encoding(self):
+        model_name = "microsoft/beit-base-patch16-224-pt22k"
+        model = BeitModel.from_pretrained(model_name, **{"use_absolute_position_embeddings": True}).to(torch_device)
+
+        image = Image.open("./tests/fixtures/tests_samples/COCO/000000039769.png")
+        processor = BeitImageProcessor.from_pretrained(model_name)
+        inputs = processor(images=image, return_tensors="pt", size={"height": 480, "width": 480})
+        pixel_values = inputs.pixel_values.to(torch_device)
+
+        # with interpolate_pos_encoding being False an exception should be raised with higher resolution
+        # images than what the model supports.
+        self.assertFalse(processor.do_center_crop)
+        with torch.no_grad():
+            with self.assertRaises(ValueError, msg="doesn't match model"):
+                model(pixel_values, interpolate_pos_encoding=False)
+
+        # with interpolate_pos_encoding being True the model should process the higher resolution image
+        # successfully and produce the expected output.
+        with torch.no_grad():
+            outputs = model(pixel_values, interpolate_pos_encoding=True)
+
+        expected_shape = torch.Size((1, 1801, 768))
+        self.assertEqual(outputs.last_hidden_state.shape, expected_shape)
+
 
 @require_torch
 class BeitBackboneTest(unittest.TestCase, BackboneTesterMixin):