Update serving code to enable saved_model=True (#18153)

* Add serving_output and serving methods to some vision models

* Add serving outputs for DeiT

* Don't convert hidden states - differing shapes

* Make saveable

* Fix up

* Make swin saveable

* Add in tests

* Fix funnel tests (can't convert to tensor)

* Fix numpy call

* Tidy up a bit

* Add in hidden states - resnet

* Remove numpy

* Fix failing tests - tensor shape and skipping tests

* Remove duplicated function

* PR comments - formatting and var names

* PR comments
Add suggestions made by Joao Gante:
* Use tf.shape instead of shape_list
* Use @tooslow decorator on tests
* Simplify some of the logic

* PR comments
Address Yih-Dar Sheih comments - making tensor names consistent and make types float

* Types consistent with docs; disable test on swin (slow)

* CI trigger

* Change input_features to float32

* Add serving_output for segformer

* Fixup

Co-authored-by: Amy Roberts <amyeroberts@users.noreply.github.com>

tests/models/swin/test_modeling_tf_swin.py

@@ -21,7 +21,7 @@ import unittest
 import numpy as np
 
 from transformers import SwinConfig
-from transformers.testing_utils import require_tf, require_vision, slow, to_2tuple
+from transformers.testing_utils import require_tf, require_vision, slow, to_2tuple, tooslow
 from transformers.utils import cached_property, is_tf_available, is_vision_available
 
 from ...test_configuration_common import ConfigTester
@@ -225,6 +225,10 @@ class TFSwinModelTest(TFModelTesterMixin, unittest.TestCase):
     def test_inputs_embeds(self):
         pass
 
+    @tooslow
+    def test_saved_model_creation(self):
+        pass
+
     def test_model_common_attributes(self):
         config, _ = self.model_tester.prepare_config_and_inputs_for_common()