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107 lines
5.1 KiB
Markdown
107 lines
5.1 KiB
Markdown
<!--Copyright 2026 The HuggingFace Team. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
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an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
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⚠️ Note that this file is in Markdown but contain specific syntax for our doc-builder (similar to MDX) that may not be
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rendered properly in your Markdown viewer.
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-->
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# Procesatoare multimodale
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Un procesator combină un tokenizer cu unul sau mai multe procesatoare de modalitate, cum ar fi un procesator de imagini, un procesator video sau un feature extractor. Expune o singură metodă `__call__` care direcționează fiecare input la componenta potrivită și îmbină ieșirile într-un singur dicționar.
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Unele modele multimodale intercalează textul cu imagini, videoclipuri sau audio. Pentru aceste modele, [`ProcessorMixin`] poate înlocui token-urile placeholder precum `<image>`, `<video>` și `<audio>` cu pattern-ul de token pe care îl așteaptă modelul.
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## Adăugarea unui procesator nou
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Definești o clasă de procesator creând `src/transformers/models/<model>/processing_<my_model_name>.py` și subclasând `ProcessorMixin`. Asigură-te că definești un obiect `TypedDict` cu valori implicite și îl atribui ca `cls.valid_processor_kwargs`.
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```python
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from ...processing_utils import ProcessorMixin, ProcessingKwargs, Unpack
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class MyModelProcessorKwargs(ProcessingKwargs, total=False):
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images_kwargs: MyModelImageProcessorKwargs
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_defaults = {
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"text_kwargs": {"padding": True},
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"images_kwargs": {"do_convert_rgb": True},
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}
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class MyModelProcessor(ProcessorMixin):
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valid_processor_kwargs = MyModelProcessorKwargs
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def __init__(self, image_processor, tokenizer, chat_template=None, **kwargs):
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self.image_token = tokenizer.image_token
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self.image_token_id = tokenizer.image_token_id
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super().__init__(
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image_processor=image_processor,
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tokenizer=tokenizer,
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chat_template=chat_template,
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**kwargs,
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)
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```
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Implementează `replace_<modality>_token` dacă e nevoie. Acesta primește dicționarul complet de ieșire de la subprocesator și indexul inputului curent, returnând șirul de înlocuire expandat pentru acel input. Șirul de înlocuire este ceea ce modelul așteaptă în secvența de input.
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Dacă modelul nu folosește deloc repetarea placeholder-ului (fără `image_token` definit), nu trebuie să suprascrii această metodă. Lasă `self.image_token` nesetat și clasa de bază sare peste înlocuire complet.
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```python
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def replace_image_token(self, image_inputs: dict, image_idx: int) -> str:
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num_crops = image_inputs["num_crops"][image_idx]
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return f"{self.boi_token}{self.image_token * self.num_image_tokens * num_crops}{self.eoi_token}"
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```
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Opțional, suprascrie metodele `prepare_inputs_layout` și `validate_inputs` dacă modelul necesită o structură specifică de input înainte ca procesarea să înceapă, precum reordonarea imaginilor ca o listă imbricată sau o validare specifică modelului pe lângă verificările comune.
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```python
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def prepare_inputs_layout(self, images=None, text=None, videos=None, audio=None, **kwargs):
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# Apelează `super()` ca să aplici mai întâi pașii comuni de pregătire
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images, text, videos, audio = super().prepare_inputs_layout(images, text, videos, audio)
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if images is not None:
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images = make_nested_list_of_images(images)
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return images, text, videos, audio
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def validate_inputs(self, images=None, text=None, videos=None, audio=None, **kwargs):
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super().validate_inputs(images=images, text=text, **kwargs)
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if text is not None and images is not None:
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n_tokens = [s.count(self.image_token) for s in text]
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n_images = [len(img_list) for img_list in images]
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if n_tokens != n_images:
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raise ValueError(
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f"Number of {self.image_token} tokens in text {n_tokens} does not match "
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f"number of images {n_images}."
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)
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```
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> [!TIP]
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> Vezi [`Gemma4Processor`] și [`Qwen2VLProcessor`] ca referință.
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## Testare
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Toate procesatoarele multimodale ar trebui să aibă o clasă de test care moștenește din [`ProcessorTesterMixin`]. Mixin-ul acesta oferă o suită standard care acoperă tokenizarea, procesarea imaginilor, batch-urile și codificarea round-trip.
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```python
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# tests/models/my_model_name/test_processor_<my_model_name>.py
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from transformers.testing_utils import require_vision
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from transformers.utils import is_vision_available
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from ...test_processing_common import ProcessorTesterMixin
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if is_vision_available():
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from transformers import MyModelProcessor
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@require_vision
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class MyModelProcessorTest(ProcessorTesterMixin, unittest.TestCase):
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processor_class = MyModelProcessor
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def get_processor(self):
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return MyModelProcessor.from_pretrained("hf-internal-testing/my-model-test")
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```
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