Input data format (#25464)

* Add copied from statements for image processors

* Move out rescale and normalize to base image processor

* Remove rescale and normalize from vit (post rebase)

* Update docstrings and tidy up

* PR comments

* Add input_data_format as preprocess argument

* Resolve tests and tidy up

* Remove num_channels argument

* Update doc strings -> default ints not in code formatting

tests/models/flava/test_image_processing_flava.py

@@ -337,6 +337,11 @@ class FlavaImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
     def test_call_numpy(self):
         self._test_call_framework(np.ndarray, prepare_kwargs={"numpify": True})
 
+    def test_call_numpy_4_channels(self):
+        self.image_processing_class.num_channels = 4
+        self._test_call_framework(np.ndarray, prepare_kwargs={"numpify": True})
+        self.image_processing_class.num_channels = 3
+
     def test_call_pytorch(self):
         self._test_call_framework(torch.Tensor, prepare_kwargs={"torchify": True})