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processing_donut.py
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processing_donut.py
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# coding=utf-8
# Copyright 2022 The HuggingFace Inc. team.
#
# 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.
"""
Processor class for Donut.
"""
import re
import warnings
from contextlib import contextmanager
from ...processing_utils import ProcessorMixin
class DonutProcessor(ProcessorMixin):
r"""
Constructs a Donut processor which wraps a Donut image processor and an XLMRoBERTa tokenizer into a single
processor.
[`DonutProcessor`] offers all the functionalities of [`DonutImageProcessor`] and
[`XLMRobertaTokenizer`/`XLMRobertaTokenizerFast`]. See the [`~DonutProcessor.__call__`] and
[`~DonutProcessor.decode`] for more information.
Args:
image_processor ([`DonutImageProcessor`], *optional*):
An instance of [`DonutImageProcessor`]. The image processor is a required input.
tokenizer ([`XLMRobertaTokenizer`/`XLMRobertaTokenizerFast`], *optional*):
An instance of [`XLMRobertaTokenizer`/`XLMRobertaTokenizerFast`]. The tokenizer is a required input.
"""
attributes = ["image_processor", "tokenizer"]
image_processor_class = "AutoImageProcessor"
tokenizer_class = "AutoTokenizer"
def __init__(self, image_processor=None, tokenizer=None, **kwargs):
feature_extractor = None
if "feature_extractor" in kwargs:
warnings.warn(
"The `feature_extractor` argument is deprecated and will be removed in v5, use `image_processor`"
" instead.",
FutureWarning,
)
feature_extractor = kwargs.pop("feature_extractor")
image_processor = image_processor if image_processor is not None else feature_extractor
if image_processor is None:
raise ValueError("You need to specify an `image_processor`.")
if tokenizer is None:
raise ValueError("You need to specify a `tokenizer`.")
super().__init__(image_processor, tokenizer)
self.current_processor = self.image_processor
self._in_target_context_manager = False
def __call__(self, *args, **kwargs):
"""
When used in normal mode, this method forwards all its arguments to AutoImageProcessor's
[`~AutoImageProcessor.__call__`] and returns its output. If used in the context
[`~DonutProcessor.as_target_processor`] this method forwards all its arguments to DonutTokenizer's
[`~DonutTokenizer.__call__`]. Please refer to the doctsring of the above two methods for more information.
"""
# For backward compatibility
if self._in_target_context_manager:
return self.current_processor(*args, **kwargs)
images = kwargs.pop("images", None)
text = kwargs.pop("text", None)
if len(args) > 0:
images = args[0]
args = args[1:]
if images is None and text is None:
raise ValueError("You need to specify either an `images` or `text` input to process.")
if images is not None:
inputs = self.image_processor(images, *args, **kwargs)
if text is not None:
encodings = self.tokenizer(text, **kwargs)
if text is None:
return inputs
elif images is None:
return encodings
else:
inputs["labels"] = encodings["input_ids"]
return inputs
def batch_decode(self, *args, **kwargs):
"""
This method forwards all its arguments to DonutTokenizer's [`~PreTrainedTokenizer.batch_decode`]. Please refer
to the docstring of this method for more information.
"""
return self.tokenizer.batch_decode(*args, **kwargs)
def decode(self, *args, **kwargs):
"""
This method forwards all its arguments to DonutTokenizer's [`~PreTrainedTokenizer.decode`]. Please refer to the
docstring of this method for more information.
"""
return self.tokenizer.decode(*args, **kwargs)
@contextmanager
def as_target_processor(self):
"""
Temporarily sets the tokenizer for processing the input. Useful for encoding the labels when fine-tuning TrOCR.
"""
warnings.warn(
"`as_target_processor` is deprecated and will be removed in v5 of Transformers. You can process your "
"labels by using the argument `text` of the regular `__call__` method (either in the same call as "
"your images inputs, or in a separate call."
)
self._in_target_context_manager = True
self.current_processor = self.tokenizer
yield
self.current_processor = self.image_processor
self._in_target_context_manager = False
def token2json(self, tokens, is_inner_value=False, added_vocab=None):
"""
Convert a (generated) token sequence into an ordered JSON format.
"""
if added_vocab is None:
added_vocab = self.tokenizer.get_added_vocab()
output = {}
while tokens:
start_token = re.search(r"<s_(.*?)>", tokens, re.IGNORECASE)
if start_token is None:
break
key = start_token.group(1)
key_escaped = re.escape(key)
end_token = re.search(rf"</s_{key_escaped}>", tokens, re.IGNORECASE)
start_token = start_token.group()
if end_token is None:
tokens = tokens.replace(start_token, "")
else:
end_token = end_token.group()
start_token_escaped = re.escape(start_token)
end_token_escaped = re.escape(end_token)
content = re.search(
f"{start_token_escaped}(.*?){end_token_escaped}", tokens, re.IGNORECASE | re.DOTALL
)
if content is not None:
content = content.group(1).strip()
if r"<s_" in content and r"</s_" in content: # non-leaf node
value = self.token2json(content, is_inner_value=True, added_vocab=added_vocab)
if value:
if len(value) == 1:
value = value[0]
output[key] = value
else: # leaf nodes
output[key] = []
for leaf in content.split(r"<sep/>"):
leaf = leaf.strip()
if leaf in added_vocab and leaf[0] == "<" and leaf[-2:] == "/>":
leaf = leaf[1:-2] # for categorical special tokens
output[key].append(leaf)
if len(output[key]) == 1:
output[key] = output[key][0]
tokens = tokens[tokens.find(end_token) + len(end_token) :].strip()
if tokens[:6] == r"<sep/>": # non-leaf nodes
return [output] + self.token2json(tokens[6:], is_inner_value=True, added_vocab=added_vocab)
if len(output):
return [output] if is_inner_value else output
else:
return [] if is_inner_value else {"text_sequence": tokens}
@property
def feature_extractor_class(self):
warnings.warn(
"`feature_extractor_class` is deprecated and will be removed in v5. Use `image_processor_class` instead.",
FutureWarning,
)
return self.image_processor_class
@property
def feature_extractor(self):
warnings.warn(
"`feature_extractor` is deprecated and will be removed in v5. Use `image_processor` instead.",
FutureWarning,
)
return self.image_processor