Add validate images and text inputs order util for processors and tes…

…t_processing_utils (#33285)

* Add validate images and test processing utils

* Remove encoded text from possible inputs in tests

* Removed encoded inputs as valid in processing_utils

* change text input check to be recursive

* change text check to all element of lists and not just the first one in recursive checks

src/transformers/processing_utils.py

@@ -27,7 +27,7 @@
 import numpy as np
 
 from .dynamic_module_utils import custom_object_save
-from .image_utils import ChannelDimension, is_vision_available
+from .image_utils import ChannelDimension, is_vision_available, valid_images
 
 
 if is_vision_available():
@@ -993,6 +993,50 @@ def apply_chat_template(
         )
 
 
+def _validate_images_text_input_order(images, text):
+    """
+    For backward compatibility: reverse the order of `images` and `text` inputs if they are swapped.
+    This method should only be called for processors where `images` and `text` have been swapped for uniformization purposes.
+    Note that this method assumes that two `None` inputs are valid inputs. If this is not the case, it should be handled
+    in the processor's `__call__` method before calling this method.
+    """
+
+    def _is_valid_text_input_for_processor(t):
+        if isinstance(t, str):
+            # Strings are fine
+            return True
+        elif isinstance(t, (list, tuple)):
+            # List are fine as long as they are...
+            if len(t) == 0:
+                # ... not empty
+                return False
+            for t_s in t:
+                return _is_valid_text_input_for_processor(t_s)
+        return False
+
+    def _is_valid(input, validator):
+        return validator(input) or input is None
+
+    images_is_valid = _is_valid(images, valid_images)
+    images_is_text = _is_valid_text_input_for_processor(images) if not images_is_valid else False
+
+    text_is_valid = _is_valid(text, _is_valid_text_input_for_processor)
+    text_is_images = valid_images(text) if not text_is_valid else False
+    # Handle cases where both inputs are valid
+    if images_is_valid and text_is_valid:
+        return images, text
+
+    # Handle cases where inputs need to and can be swapped
+    if (images is None and text_is_images) or (text is None and images_is_text) or (images_is_text and text_is_images):
+        logger.warning_once(
+            "You may have used the wrong order for inputs. `images` should be passed before `text`. "
+            "The `images` and `text` inputs will be swapped. This behavior will be deprecated in transformers v4.47."
+        )
+        return text, images
+
+    raise ValueError("Invalid input type. Check that `images` and/or `text` are valid inputs.")
+
+
 ProcessorMixin.push_to_hub = copy_func(ProcessorMixin.push_to_hub)
 if ProcessorMixin.push_to_hub.__doc__ is not None:
     ProcessorMixin.push_to_hub.__doc__ = ProcessorMixin.push_to_hub.__doc__.format(

tests/utils/test_processing_utils.py

@@ -0,0 +1,164 @@
+# coding=utf-8
+# Copyright 2024 HuggingFace Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+import numpy as np
+
+from transformers import is_torch_available, is_vision_available
+from transformers.processing_utils import _validate_images_text_input_order
+from transformers.testing_utils import require_torch, require_vision
+
+
+if is_vision_available():
+    import PIL
+
+if is_torch_available():
+    import torch
+
+
+@require_vision
+class ProcessingUtilTester(unittest.TestCase):
+    def test_validate_images_text_input_order(self):
+        # text string and PIL images inputs
+        images = PIL.Image.new("RGB", (224, 224))
+        text = "text"
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+
+        # text list of string and numpy images inputs
+        images = np.random.rand(224, 224, 3)
+        text = ["text1", "text2"]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertTrue(np.array_equal(valid_images, images))
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertTrue(np.array_equal(valid_images, images))
+        self.assertEqual(valid_text, text)
+
+        # text nested list of string and list of pil images inputs
+        images = [PIL.Image.new("RGB", (224, 224)), PIL.Image.new("RGB", (224, 224))]
+        text = [["text1", "text2, text3"], ["text3", "text4"]]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+
+        # list of strings and list of numpy images inputs
+        images = [np.random.rand(224, 224, 3), np.random.rand(224, 224, 3)]
+        text = ["text1", "text2"]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertTrue(np.array_equal(valid_images[0], images[0]))
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertTrue(np.array_equal(valid_images[0], images[0]))
+        self.assertEqual(valid_text, text)
+
+        # list of strings and nested list of numpy images inputs
+        images = [[np.random.rand(224, 224, 3), np.random.rand(224, 224, 3)], [np.random.rand(224, 224, 3)]]
+        text = ["text1", "text2"]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertTrue(np.array_equal(valid_images[0][0], images[0][0]))
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertTrue(np.array_equal(valid_images[0][0], images[0][0]))
+        self.assertEqual(valid_text, text)
+
+        # nested list of strings and nested list of PIL images inputs
+        images = [
+            [PIL.Image.new("RGB", (224, 224)), PIL.Image.new("RGB", (224, 224))],
+            [PIL.Image.new("RGB", (224, 224))],
+        ]
+        text = [["text1", "text2, text3"], ["text3", "text4"]]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertEqual(valid_images, images)
+        self.assertEqual(valid_text, text)
+
+        # None images
+        images = None
+        text = "text"
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertEqual(images, None)
+        self.assertEqual(text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertEqual(images, None)
+        self.assertEqual(text, text)
+
+        # None text
+        images = PIL.Image.new("RGB", (224, 224))
+        text = None
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertEqual(images, images)
+        self.assertEqual(text, None)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertEqual(images, images)
+        self.assertEqual(text, None)
+
+        # incorrect inputs
+        images = "text"
+        text = "text"
+        with self.assertRaises(ValueError):
+            _validate_images_text_input_order(images=images, text=text)
+
+    @require_torch
+    def test_validate_images_text_input_order_torch(self):
+        # text string and torch images inputs
+        images = torch.rand(224, 224, 3)
+        text = "text"
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertTrue(torch.equal(valid_images, images))
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertTrue(torch.equal(valid_images, images))
+        self.assertEqual(valid_text, text)
+
+        # text list of string and list of torch images inputs
+        images = [torch.rand(224, 224, 3), torch.rand(224, 224, 3)]
+        text = ["text1", "text2"]
+        # test correct text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=images, text=text)
+        self.assertTrue(torch.equal(valid_images[0], images[0]))
+        self.assertEqual(valid_text, text)
+        # test incorrect text and images order
+        valid_images, valid_text = _validate_images_text_input_order(images=text, text=images)
+        self.assertTrue(torch.equal(valid_images[0], images[0]))
+        self.assertEqual(valid_text, text)