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feat: [Beta] Extraction with schema (#2138)

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* Add DocumentConverter.extract and full extraction pipeline

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add DocumentConverter.extract template arg

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add NuExtract model

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add Extraction pipeline

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add proper test, support pydantic class types

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add qr bill example

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add base_extraction_pipeline

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add types

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update typing of ExtractionResult and inner fields

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Factor out extract to DocumentExtractor

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Address mypy issues

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add DocumentExtractor

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Resolve circular import issue

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Clean up imports, remove Optional for template arg

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Move new type definitions into datamodel

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update comments

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Respect page-range, disable test_extraction for CI

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

---------

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
This commit is contained in:
Christoph Auer
2025-09-01 16:09:48 +02:00
committed by GitHub
parent a283ccff25
commit 9f4bc5b2f1
14 changed files with 1171 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
docling/datamodel/base_models.py
View File

@@ -1,7 +1,7 @@
import math
from collections import defaultdict
from enum import Enum
from typing import TYPE_CHECKING, Dict, List, Optional, Union
from typing import TYPE_CHECKING, Dict, List, Optional, Type, Union
import numpy as np
from docling_core.types.doc import (
@@ -32,6 +32,18 @@ from pydantic import (
if TYPE_CHECKING:
from docling.backend.pdf_backend import PdfPageBackend
from docling.backend.abstract_backend import AbstractDocumentBackend
from docling.datamodel.pipeline_options import PipelineOptions
class BaseFormatOption(BaseModel):
"""Base class for format options used by _DocumentConversionInput."""
pipeline_options: Optional[PipelineOptions] = None
backend: Type[AbstractDocumentBackend]
model_config = ConfigDict(arbitrary_types_allowed=True)
class ConversionStatus(str, Enum):
PENDING = "pending"

8
docling/datamodel/document.py
View File

@@ -2,12 +2,13 @@ import csv
import logging
import re
import tarfile
from collections.abc import Iterable
from collections.abc import Iterable, Mapping
from enum import Enum
from io import BytesIO
from pathlib import Path, PurePath
from typing import (
TYPE_CHECKING,
Any,
Dict,
List,
Literal,
@@ -72,7 +73,7 @@ from docling.utils.profiling import ProfilingItem
from docling.utils.utils import create_file_hash
if TYPE_CHECKING:
from docling.document_converter import FormatOption
from docling.datamodel.base_models import BaseFormatOption
_log = logging.getLogger(__name__)
@@ -238,7 +239,8 @@ class _DocumentConversionInput(BaseModel):
limits: Optional[DocumentLimits] = DocumentLimits()
def docs(
self, format_options: Dict[InputFormat, "FormatOption"]
self,
format_options: Mapping[InputFormat, "BaseFormatOption"],
) -> Iterable[InputDocument]:
for item in self.path_or_stream_iterator:
obj = (

39
docling/datamodel/extraction.py Normal file
View File

@@ -0,0 +1,39 @@
"""Data models for document extraction functionality."""
from typing import Any, Dict, List, Optional, Type, Union
from pydantic import BaseModel, Field
from docling.datamodel.base_models import ConversionStatus, ErrorItem
from docling.datamodel.document import InputDocument
class ExtractedPageData(BaseModel):
"""Data model for extracted content from a single page."""
page_no: int = Field(..., description="1-indexed page number")
extracted_data: Optional[Dict[str, Any]] = Field(
None, description="Extracted structured data from the page"
)
raw_text: Optional[str] = Field(None, description="Raw extracted text")
errors: List[str] = Field(
default_factory=list,
description="Any errors encountered during extraction for this page",
)
class ExtractionResult(BaseModel):
"""Result of document extraction."""
input: InputDocument
status: ConversionStatus = ConversionStatus.PENDING
errors: List[ErrorItem] = []
# Pages field - always a list for consistency
pages: List[ExtractedPageData] = Field(
default_factory=list, description="Extracted data from each page"
)
# Type alias for template parameters that can be string, dict, or BaseModel
ExtractionTemplateType = Union[str, Dict[str, Any], BaseModel, Type[BaseModel]]

13
docling/datamodel/pipeline_options.py
View File

@@ -37,6 +37,7 @@ from docling.datamodel.pipeline_options_vlm_model import (
from docling.datamodel.vlm_model_specs import (
GRANITE_VISION_OLLAMA as granite_vision_vlm_ollama_conversion_options,
GRANITE_VISION_TRANSFORMERS as granite_vision_vlm_conversion_options,
NU_EXTRACT_2B_TRANSFORMERS,
SMOLDOCLING_MLX as smoldocling_vlm_mlx_conversion_options,
SMOLDOCLING_TRANSFORMERS as smoldocling_vlm_conversion_options,
VlmModelType,
@@ -247,12 +248,9 @@ class OcrEngine(str, Enum):
RAPIDOCR = "rapidocr"
class PipelineOptions(BaseModel):
class PipelineOptions(BaseOptions):
"""Base pipeline options."""
create_legacy_output: bool = (
True # This default will be set to False on a future version of docling
)
document_timeout: Optional[float] = None
accelerator_options: AcceleratorOptions = AcceleratorOptions()
enable_remote_services: bool = False
@@ -296,6 +294,13 @@ class AsrPipelineOptions(PipelineOptions):
artifacts_path: Optional[Union[Path, str]] = None
class VlmExtractionPipelineOptions(PipelineOptions):
"""Options for extraction pipeline."""
artifacts_path: Optional[Union[Path, str]] = None
vlm_options: Union[InlineVlmOptions] = NU_EXTRACT_2B_TRANSFORMERS
class PdfPipelineOptions(PaginatedPipelineOptions):
"""Options for the PDF pipeline."""

17
docling/datamodel/vlm_model_specs.py
View File

@@ -247,6 +247,23 @@ DOLPHIN_TRANSFORMERS = InlineVlmOptions(
temperature=0.0,
)
# NuExtract
NU_EXTRACT_2B_TRANSFORMERS = InlineVlmOptions(
repo_id="numind/NuExtract-2.0-2B",
prompt="", # This won't be used, template is passed separately
torch_dtype="bfloat16",
inference_framework=InferenceFramework.TRANSFORMERS,
transformers_model_type=TransformersModelType.AUTOMODEL_IMAGETEXTTOTEXT,
response_format=ResponseFormat.PLAINTEXT,
supported_devices=[
AcceleratorDevice.CPU,
AcceleratorDevice.CUDA,
AcceleratorDevice.MPS,
],
scale=2.0,
temperature=0.0,
)
class VlmModelType(str, Enum):
SMOLDOCLING = "smoldocling"

9
docling/document_converter.py
View File

@@ -28,6 +28,7 @@ from docling.backend.noop_backend import NoOpBackend
from docling.backend.xml.jats_backend import JatsDocumentBackend
from docling.backend.xml.uspto_backend import PatentUsptoDocumentBackend
from docling.datamodel.base_models import (
BaseFormatOption,
ConversionStatus,
DoclingComponentType,
DocumentStream,
@@ -57,12 +58,8 @@ _log = logging.getLogger(__name__)
_PIPELINE_CACHE_LOCK = threading.Lock()
class FormatOption(BaseModel):
class FormatOption(BaseFormatOption):
pipeline_cls: Type[BasePipeline]
pipeline_options: Optional[PipelineOptions] = None
backend: Type[AbstractDocumentBackend]
model_config = ConfigDict(arbitrary_types_allowed=True)
@model_validator(mode="after")
def set_optional_field_default(self) -> "FormatOption":
@@ -191,7 +188,7 @@ class DocumentConverter:
self.allowed_formats = (
allowed_formats if allowed_formats is not None else list(InputFormat)
)
self.format_to_options = {
self.format_to_options: Dict[InputFormat, FormatOption] = {
format: (
_get_default_option(format=format)
if (custom_option := (format_options or {}).get(format)) is None

325
docling/document_extractor.py Normal file
View File

@@ -0,0 +1,325 @@
import hashlib
import logging
import sys
import threading
import time
import warnings
from collections.abc import Iterable, Iterator
from concurrent.futures import ThreadPoolExecutor
from functools import partial
from pathlib import Path
from typing import Dict, List, Optional, Tuple, Type, Union
from pydantic import ConfigDict, model_validator, validate_call
from docling.backend.abstract_backend import AbstractDocumentBackend
from docling.backend.pypdfium2_backend import PyPdfiumDocumentBackend
from docling.datamodel.base_models import (
BaseFormatOption,
ConversionStatus,
DoclingComponentType,
DocumentStream,
ErrorItem,
InputFormat,
)
from docling.datamodel.document import (
InputDocument,
_DocumentConversionInput, # intentionally reused builder
)
from docling.datamodel.extraction import ExtractionResult, ExtractionTemplateType
from docling.datamodel.pipeline_options import PipelineOptions
from docling.datamodel.settings import (
DEFAULT_PAGE_RANGE,
DocumentLimits,
PageRange,
settings,
)
from docling.exceptions import ConversionError
from docling.pipeline.base_extraction_pipeline import BaseExtractionPipeline
from docling.pipeline.extraction_vlm_pipeline import ExtractionVlmPipeline
from docling.utils.utils import chunkify
_log = logging.getLogger(__name__)
_PIPELINE_CACHE_LOCK = threading.Lock()
class ExtractionFormatOption(BaseFormatOption):
"""Per-format configuration for extraction.
Notes:
- `pipeline_cls` must subclass `BaseExtractionPipeline`.
- `pipeline_options` is typed as `PipelineOptions` which MUST inherit from
`BaseOptions` (as used by `BaseExtractionPipeline`).
- `backend` is the document-opening backend used by `_DocumentConversionInput`.
"""
pipeline_cls: Type[BaseExtractionPipeline]
@model_validator(mode="after")
def set_optional_field_default(self) -> "ExtractionFormatOption":
if self.pipeline_options is None:
# `get_default_options` comes from BaseExtractionPipeline
self.pipeline_options = self.pipeline_cls.get_default_options() # type: ignore[assignment]
return self
def _get_default_extraction_option(fmt: InputFormat) -> ExtractionFormatOption:
"""Return the default extraction option for a given input format.
Defaults mirror the converter's *backend* choices, while the pipeline is
the VLM extractor. This duplication will be removed when we deduplicate
the format registry between convert/extract.
"""
format_to_default_backend: Dict[InputFormat, Type[AbstractDocumentBackend]] = {
InputFormat.IMAGE: PyPdfiumDocumentBackend,
InputFormat.PDF: PyPdfiumDocumentBackend,
}
backend = format_to_default_backend.get(fmt)
if backend is None:
raise RuntimeError(f"No default extraction backend configured for {fmt}")
return ExtractionFormatOption(
pipeline_cls=ExtractionVlmPipeline,
backend=backend,
)
class DocumentExtractor:
"""Standalone extractor class.
Public API:
- `extract(...) -> ExtractionResult`
- `extract_all(...) -> Iterator[ExtractionResult]`
Implementation intentionally reuses `_DocumentConversionInput` to build
`InputDocument` with the correct backend per format.
"""
def __init__(
self,
allowed_formats: Optional[List[InputFormat]] = None,
extraction_format_options: Optional[
Dict[InputFormat, ExtractionFormatOption]
] = None,
) -> None:
self.allowed_formats: List[InputFormat] = (
allowed_formats if allowed_formats is not None else list(InputFormat)
)
# Build per-format options with defaults, then apply any user overrides
overrides = extraction_format_options or {}
self.extraction_format_to_options: Dict[InputFormat, ExtractionFormatOption] = {
fmt: overrides.get(fmt, _get_default_extraction_option(fmt))
for fmt in self.allowed_formats
}
# Cache pipelines by (class, options-hash)
self._initialized_pipelines: Dict[
Tuple[Type[BaseExtractionPipeline], str], BaseExtractionPipeline
] = {}
# ---------------------------- Public API ---------------------------------
@validate_call(config=ConfigDict(strict=True))
def extract(
self,
source: Union[Path, str, DocumentStream],
template: ExtractionTemplateType,
headers: Optional[Dict[str, str]] = None,
raises_on_error: bool = True,
max_num_pages: int = sys.maxsize,
max_file_size: int = sys.maxsize,
page_range: PageRange = DEFAULT_PAGE_RANGE,
) -> ExtractionResult:
all_res = self.extract_all(
source=[source],
headers=headers,
raises_on_error=raises_on_error,
max_num_pages=max_num_pages,
max_file_size=max_file_size,
page_range=page_range,
template=template,
)
return next(all_res)
@validate_call(config=ConfigDict(strict=True))
def extract_all(
self,
source: Iterable[Union[Path, str, DocumentStream]],
template: ExtractionTemplateType,
headers: Optional[Dict[str, str]] = None,
raises_on_error: bool = True,
max_num_pages: int = sys.maxsize,
max_file_size: int = sys.maxsize,
page_range: PageRange = DEFAULT_PAGE_RANGE,
) -> Iterator[ExtractionResult]:
warnings.warn(
"The extract API is currently experimental and may change without prior notice.\n"
"Only PDF and image formats are supported.",
UserWarning,
stacklevel=2,
)
limits = DocumentLimits(
max_num_pages=max_num_pages,
max_file_size=max_file_size,
page_range=page_range,
)
conv_input = _DocumentConversionInput(
path_or_stream_iterator=source, limits=limits, headers=headers
)
ext_res_iter = self._extract(
conv_input, raises_on_error=raises_on_error, template=template
)
had_result = False
for ext_res in ext_res_iter:
had_result = True
if raises_on_error and ext_res.status not in {
ConversionStatus.SUCCESS,
ConversionStatus.PARTIAL_SUCCESS,
}:
raise ConversionError(
f"Extraction failed for: {ext_res.input.file} with status: {ext_res.status}"
)
else:
yield ext_res
if not had_result and raises_on_error:
raise ConversionError(
"Extraction failed because the provided file has no recognizable format or it wasn't in the list of allowed formats."
)
# --------------------------- Internal engine ------------------------------
def _extract(
self,
conv_input: _DocumentConversionInput,
raises_on_error: bool,
template: ExtractionTemplateType,
) -> Iterator[ExtractionResult]:
start_time = time.monotonic()
for input_batch in chunkify(
conv_input.docs(self.extraction_format_to_options),
settings.perf.doc_batch_size,
):
_log.info("Going to extract document batch...")
process_func = partial(
self._process_document_extraction,
raises_on_error=raises_on_error,
template=template,
)
if (
settings.perf.doc_batch_concurrency > 1
and settings.perf.doc_batch_size > 1
):
with ThreadPoolExecutor(
max_workers=settings.perf.doc_batch_concurrency
) as pool:
for item in pool.map(
process_func,
input_batch,
):
yield item
else:
for item in map(
process_func,
input_batch,
):
elapsed = time.monotonic() - start_time
start_time = time.monotonic()
_log.info(
f"Finished extracting document {item.input.file.name} in {elapsed:.2f} sec."
)
yield item
def _process_document_extraction(
self,
in_doc: InputDocument,
raises_on_error: bool,
template: ExtractionTemplateType,
) -> ExtractionResult:
valid = (
self.allowed_formats is not None and in_doc.format in self.allowed_formats
)
if valid:
return self._execute_extraction_pipeline(
in_doc, raises_on_error=raises_on_error, template=template
)
else:
error_message = f"File format not allowed: {in_doc.file}"
if raises_on_error:
raise ConversionError(error_message)
else:
error_item = ErrorItem(
component_type=DoclingComponentType.USER_INPUT,
module_name="",
error_message=error_message,
)
return ExtractionResult(
input=in_doc, status=ConversionStatus.SKIPPED, errors=[error_item]
)
def _execute_extraction_pipeline(
self,
in_doc: InputDocument,
raises_on_error: bool,
template: ExtractionTemplateType,
) -> ExtractionResult:
if not in_doc.valid:
if raises_on_error:
raise ConversionError(f"Input document {in_doc.file} is not valid.")
else:
return ExtractionResult(input=in_doc, status=ConversionStatus.FAILURE)
pipeline = self._get_pipeline(in_doc.format)
if pipeline is None:
if raises_on_error:
raise ConversionError(
f"No extraction pipeline could be initialized for {in_doc.file}."
)
else:
return ExtractionResult(input=in_doc, status=ConversionStatus.FAILURE)
return pipeline.execute(
in_doc, raises_on_error=raises_on_error, template=template
)
def _get_pipeline(
self, doc_format: InputFormat
) -> Optional[BaseExtractionPipeline]:
"""Retrieve or initialize a pipeline, reusing instances based on class and options."""
fopt = self.extraction_format_to_options.get(doc_format)
if fopt is None or fopt.pipeline_options is None:
return None
pipeline_class = fopt.pipeline_cls
pipeline_options = fopt.pipeline_options
options_hash = self._get_pipeline_options_hash(pipeline_options)
cache_key = (pipeline_class, options_hash)
with _PIPELINE_CACHE_LOCK:
if cache_key not in self._initialized_pipelines:
_log.info(
f"Initializing extraction pipeline for {pipeline_class.__name__} with options hash {options_hash}"
)
self._initialized_pipelines[cache_key] = pipeline_class(
pipeline_options=pipeline_options # type: ignore[arg-type]
)
else:
_log.debug(
f"Reusing cached extraction pipeline for {pipeline_class.__name__} with options hash {options_hash}"
)
return self._initialized_pipelines[cache_key]
@staticmethod
def _get_pipeline_options_hash(pipeline_options: PipelineOptions) -> str:
"""Generate a stable hash of pipeline options to use as part of the cache key."""
options_str = str(pipeline_options.model_dump())
return hashlib.md5(
options_str.encode("utf-8"), usedforsecurity=False
).hexdigest()

290
docling/models/vlm_models_inline/nuextract_transformers_model.py Normal file
View File

@@ -0,0 +1,290 @@
import logging
import time
from collections.abc import Iterable
from pathlib import Path
from typing import Any, Optional, Union
import numpy as np
from PIL.Image import Image
from transformers import AutoModelForImageTextToText, AutoProcessor, GenerationConfig
from docling.datamodel.accelerator_options import (
AcceleratorOptions,
)
from docling.datamodel.base_models import VlmPrediction
from docling.datamodel.pipeline_options_vlm_model import InlineVlmOptions
from docling.models.base_model import BaseVlmModel
from docling.models.utils.hf_model_download import (
HuggingFaceModelDownloadMixin,
)
from docling.utils.accelerator_utils import decide_device
_log = logging.getLogger(__name__)
# Source code from https://huggingface.co/numind/NuExtract-2.0-8B
def process_all_vision_info(messages, examples=None):
"""
Process vision information from both messages and in-context examples, supporting batch processing.
Args:
messages: List of message dictionaries (single input) OR list of message lists (batch input)
examples: Optional list of example dictionaries (single input) OR list of example lists (batch)
Returns:
A flat list of all images in the correct order:
- For single input: example images followed by message images
- For batch input: interleaved as (item1 examples, item1 input, item2 examples, item2 input, etc.)
- Returns None if no images were found
"""
try:
from qwen_vl_utils import fetch_image, process_vision_info
except ImportError:
raise ImportError(
"qwen-vl-utils is required for NuExtractTransformersModel. "
"Please install it with: pip install qwen-vl-utils"
)
from qwen_vl_utils import fetch_image, process_vision_info
# Helper function to extract images from examples
def extract_example_images(example_item):
if not example_item:
return []
# Handle both list of examples and single example
examples_to_process = (
example_item if isinstance(example_item, list) else [example_item]
)
images = []
for example in examples_to_process:
if (
isinstance(example.get("input"), dict)
and example["input"].get("type") == "image"
):
images.append(fetch_image(example["input"]))
return images
# Normalize inputs to always be batched format
is_batch = messages and isinstance(messages[0], list)
messages_batch = messages if is_batch else [messages]
is_batch_examples = (
examples
and isinstance(examples, list)
and (isinstance(examples[0], list) or examples[0] is None)
)
examples_batch = (
examples
if is_batch_examples
else ([examples] if examples is not None else None)
)
# Ensure examples batch matches messages batch if provided
if examples and len(examples_batch) != len(messages_batch):
if not is_batch and len(examples_batch) == 1:
# Single example set for a single input is fine
pass
else:
raise ValueError("Examples batch length must match messages batch length")
# Process all inputs, maintaining correct order
all_images = []
for i, message_group in enumerate(messages_batch):
# Get example images for this input
if examples and i < len(examples_batch):
input_example_images = extract_example_images(examples_batch[i])
all_images.extend(input_example_images)
# Get message images for this input
input_message_images = process_vision_info(message_group)[0] or []
all_images.extend(input_message_images)
return all_images if all_images else None
class NuExtractTransformersModel(BaseVlmModel, HuggingFaceModelDownloadMixin):
def __init__(
self,
enabled: bool,
artifacts_path: Optional[Path],
accelerator_options: AcceleratorOptions,
vlm_options: InlineVlmOptions,
):
self.enabled = enabled
self.vlm_options = vlm_options
if self.enabled:
import torch
self.device = decide_device(
accelerator_options.device,
supported_devices=vlm_options.supported_devices,
)
_log.debug(f"Available device for NuExtract VLM: {self.device}")
self.max_new_tokens = vlm_options.max_new_tokens
self.temperature = vlm_options.temperature
repo_cache_folder = vlm_options.repo_id.replace("/", "--")
if artifacts_path is None:
artifacts_path = self.download_models(self.vlm_options.repo_id)
elif (artifacts_path / repo_cache_folder).exists():
artifacts_path = artifacts_path / repo_cache_folder
self.processor = AutoProcessor.from_pretrained(
artifacts_path,
trust_remote_code=vlm_options.trust_remote_code,
use_fast=True,
)
self.processor.tokenizer.padding_side = "left"
self.vlm_model = AutoModelForImageTextToText.from_pretrained(
artifacts_path,
device_map=self.device,
torch_dtype=self.vlm_options.torch_dtype,
_attn_implementation=(
"flash_attention_2"
if self.device.startswith("cuda")
and accelerator_options.cuda_use_flash_attention2
else "sdpa"
),
trust_remote_code=vlm_options.trust_remote_code,
)
self.vlm_model = torch.compile(self.vlm_model) # type: ignore
# Load generation config
self.generation_config = GenerationConfig.from_pretrained(artifacts_path)
def process_images(
self,
image_batch: Iterable[Union[Image, np.ndarray]],
prompt: Union[str, list[str]],
) -> Iterable[VlmPrediction]:
"""
Batched inference for NuExtract VLM using the specialized input format.
Args:
image_batch: Iterable of PIL Images or numpy arrays
prompt: Either:
- str: Single template used for all images
- list[str]: List of templates (one per image, must match image count)
"""
import torch
from PIL import Image as PILImage
# Normalize images to RGB PIL
pil_images: list[Image] = []
for img in image_batch:
if isinstance(img, np.ndarray):
if img.ndim == 3 and img.shape[2] in (3, 4):
pil_img = PILImage.fromarray(img.astype(np.uint8))
elif img.ndim == 2:
pil_img = PILImage.fromarray(img.astype(np.uint8), mode="L")
else:
raise ValueError(f"Unsupported numpy array shape: {img.shape}")
else:
pil_img = img
if pil_img.mode != "RGB":
pil_img = pil_img.convert("RGB")
pil_images.append(pil_img)
if not pil_images:
return
# Normalize templates (1 per image)
if isinstance(prompt, str):
templates = [prompt] * len(pil_images)
else:
if len(prompt) != len(pil_images):
raise ValueError(
f"Number of templates ({len(prompt)}) must match number of images ({len(pil_images)})"
)
templates = prompt
# Construct NuExtract input format
inputs = []
for pil_img, template in zip(pil_images, templates):
input_item = {
"document": {"type": "image", "image": pil_img},
"template": template,
}
inputs.append(input_item)
# Create messages structure for batch processing
messages = [
[
{
"role": "user",
"content": [x["document"]],
}
]
for x in inputs
]
# Apply chat template to each example individually
texts = [
self.processor.tokenizer.apply_chat_template(
messages[i],
template=x["template"],
tokenize=False,
add_generation_prompt=True,
)
for i, x in enumerate(inputs)
]
# Process vision inputs using qwen-vl-utils
image_inputs = process_all_vision_info(messages)
# Process with the processor
processor_inputs = self.processor(
text=texts,
images=image_inputs,
padding=True,
return_tensors="pt",
**self.vlm_options.extra_processor_kwargs,
)
processor_inputs = {k: v.to(self.device) for k, v in processor_inputs.items()}
# Generate
gen_kwargs = {
**processor_inputs,
"max_new_tokens": self.max_new_tokens,
"generation_config": self.generation_config,
**self.vlm_options.extra_generation_config,
}
if self.temperature > 0:
gen_kwargs["do_sample"] = True
gen_kwargs["temperature"] = self.temperature
else:
gen_kwargs["do_sample"] = False
start_time = time.time()
with torch.inference_mode():
generated_ids = self.vlm_model.generate(**gen_kwargs)
generation_time = time.time() - start_time
# Trim generated sequences
input_len = processor_inputs["input_ids"].shape[1]
trimmed_sequences = generated_ids[:, input_len:]
# Decode with the processor/tokenizer
decoded_texts: list[str] = self.processor.batch_decode(
trimmed_sequences,
skip_special_tokens=True,
clean_up_tokenization_spaces=False,
)
# Optional logging
if generated_ids.shape[0] > 0: # type: ignore
_log.debug(
f"Generated {int(generated_ids[0].shape[0])} tokens in {generation_time:.2f}s "
f"for batch size {generated_ids.shape[0]}." # type: ignore
)
for text in decoded_texts:
# Apply decode_response to the output text
decoded_text = self.vlm_options.decode_response(text)
yield VlmPrediction(text=decoded_text, generation_time=generation_time)

58
docling/pipeline/base_extraction_pipeline.py Normal file
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@@ -0,0 +1,58 @@
import logging
from abc import ABC, abstractmethod
from typing import Optional
from docling.datamodel.base_models import ConversionStatus, ErrorItem
from docling.datamodel.document import InputDocument
from docling.datamodel.extraction import ExtractionResult, ExtractionTemplateType
from docling.datamodel.pipeline_options import BaseOptions
_log = logging.getLogger(__name__)
class BaseExtractionPipeline(ABC):
def __init__(self, pipeline_options: BaseOptions):
self.pipeline_options = pipeline_options
def execute(
self,
in_doc: InputDocument,
raises_on_error: bool,
template: Optional[ExtractionTemplateType] = None,
) -> ExtractionResult:
ext_res = ExtractionResult(input=in_doc)
try:
ext_res = self._extract_data(ext_res, template)
ext_res.status = self._determine_status(ext_res)
except Exception as e:
ext_res.status = ConversionStatus.FAILURE
error_item = ErrorItem(
component_type="extraction_pipeline",
module_name=self.__class__.__name__,
error_message=str(e),
)
ext_res.errors.append(error_item)
if raises_on_error:
raise e
return ext_res
@abstractmethod
def _extract_data(
self,
ext_res: ExtractionResult,
template: Optional[ExtractionTemplateType] = None,
) -> ExtractionResult:
"""Subclass must populate ext_res.pages/errors and return the result."""
raise NotImplementedError
@abstractmethod
def _determine_status(self, ext_res: ExtractionResult) -> ConversionStatus:
"""Subclass must decide SUCCESS/PARTIAL_SUCCESS/FAILURE based on ext_res."""
raise NotImplementedError
@classmethod
@abstractmethod
def get_default_options(cls) -> BaseOptions:
pass

204
docling/pipeline/extraction_vlm_pipeline.py Normal file
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@@ -0,0 +1,204 @@
import inspect
import json
import logging
from pathlib import Path
from typing import Optional
from PIL.Image import Image
from pydantic import BaseModel
from docling.backend.abstract_backend import PaginatedDocumentBackend
from docling.backend.pdf_backend import PdfDocumentBackend
from docling.datamodel.base_models import ConversionStatus, ErrorItem
from docling.datamodel.document import InputDocument
from docling.datamodel.extraction import (
ExtractedPageData,
ExtractionResult,
ExtractionTemplateType,
)
from docling.datamodel.pipeline_options import BaseOptions, VlmExtractionPipelineOptions
from docling.datamodel.settings import settings
from docling.models.vlm_models_inline.nuextract_transformers_model import (
NuExtractTransformersModel,
)
from docling.pipeline.base_extraction_pipeline import BaseExtractionPipeline
from docling.utils.accelerator_utils import decide_device
_log = logging.getLogger(__name__)
class ExtractionVlmPipeline(BaseExtractionPipeline):
def __init__(self, pipeline_options: VlmExtractionPipelineOptions):
super().__init__(pipeline_options)
# Initialize VLM model with default options
self.accelerator_options = pipeline_options.accelerator_options
self.pipeline_options: VlmExtractionPipelineOptions
artifacts_path: Optional[Path] = None
if pipeline_options.artifacts_path is not None:
artifacts_path = Path(pipeline_options.artifacts_path).expanduser()
elif settings.artifacts_path is not None:
artifacts_path = Path(settings.artifacts_path).expanduser()
if artifacts_path is not None and not artifacts_path.is_dir():
raise RuntimeError(
f"The value of {artifacts_path=} is not valid. "
"When defined, it must point to a folder containing all models required by the pipeline."
)
# Create VLM model instance
self.vlm_model = NuExtractTransformersModel(
enabled=True,
artifacts_path=artifacts_path, # Will download automatically
accelerator_options=self.accelerator_options,
vlm_options=pipeline_options.vlm_options,
)
def _extract_data(
self,
ext_res: ExtractionResult,
template: Optional[ExtractionTemplateType] = None,
) -> ExtractionResult:
"""Extract data using the VLM model."""
try:
# Get images from input document using the backend
images = self._get_images_from_input(ext_res.input)
if not images:
ext_res.status = ConversionStatus.FAILURE
ext_res.errors.append(
ErrorItem(
component_type="extraction_pipeline",
module_name=self.__class__.__name__,
error_message="No images found in document",
)
)
return ext_res
# Use provided template or default prompt
if template is not None:
prompt = self._serialize_template(template)
else:
prompt = "Extract all text and structured information from this document. Return as JSON."
# Process all images with VLM model
start_page, end_page = ext_res.input.limits.page_range
for i, image in enumerate(images):
# Calculate the actual page number based on the filtered range
page_number = start_page + i
try:
predictions = list(self.vlm_model.process_images([image], prompt))
if predictions:
# Parse the extracted text as JSON if possible, otherwise use as-is
extracted_text = predictions[0].text
extracted_data = None
try:
extracted_data = json.loads(extracted_text)
except (json.JSONDecodeError, ValueError):
# If not valid JSON, keep extracted_data as None
pass
# Create page data with proper structure
page_data = ExtractedPageData(
page_no=page_number,
extracted_data=extracted_data,
raw_text=extracted_text, # Always populate raw_text
)
ext_res.pages.append(page_data)
else:
# Add error page data
page_data = ExtractedPageData(
page_no=page_number,
extracted_data=None,
errors=["No extraction result from VLM model"],
)
ext_res.pages.append(page_data)
except Exception as e:
_log.error(f"Error processing page {page_number}: {e}")
page_data = ExtractedPageData(
page_no=page_number, extracted_data=None, errors=[str(e)]
)
ext_res.pages.append(page_data)
except Exception as e:
_log.error(f"Error during extraction: {e}")
ext_res.errors.append(
ErrorItem(
component_type="extraction_pipeline",
module_name=self.__class__.__name__,
error_message=str(e),
)
)
return ext_res
def _determine_status(self, ext_res: ExtractionResult) -> ConversionStatus:
"""Determine the status based on extraction results."""
if ext_res.pages and not any(page.errors for page in ext_res.pages):
return ConversionStatus.SUCCESS
else:
return ConversionStatus.FAILURE
def _get_images_from_input(self, input_doc: InputDocument) -> list[Image]:
"""Extract images from input document using the backend."""
images = []
try:
backend = input_doc._backend
assert isinstance(backend, PdfDocumentBackend)
# Use the backend's pagination interface
page_count = backend.page_count()
# Respect page range limits, following the same pattern as PaginatedPipeline
start_page, end_page = input_doc.limits.page_range
_log.info(
f"Processing pages {start_page}-{end_page} of {page_count} total pages for extraction"
)
for page_num in range(page_count):
# Only process pages within the specified range (0-based indexing)
if start_page - 1 <= page_num <= end_page - 1:
try:
page_backend = backend.load_page(page_num)
if page_backend.is_valid():
# Get page image at a reasonable scale
page_image = page_backend.get_page_image(
scale=self.pipeline_options.vlm_options.scale
)
images.append(page_image)
else:
_log.warning(f"Page {page_num + 1} backend is not valid")
except Exception as e:
_log.error(f"Error loading page {page_num + 1}: {e}")
except Exception as e:
_log.error(f"Error getting images from input document: {e}")
return images
def _serialize_template(self, template: ExtractionTemplateType) -> str:
"""Serialize template to string based on its type."""
if isinstance(template, str):
return template
elif isinstance(template, dict):
return json.dumps(template, indent=2)
elif isinstance(template, BaseModel):
return template.model_dump_json(indent=2)
elif inspect.isclass(template) and issubclass(template, BaseModel):
from polyfactory.factories.pydantic_factory import ModelFactory
class ExtractionTemplateFactory(ModelFactory[template]): # type: ignore
__use_examples__ = True # prefer Field(examples=...) when present
__use_defaults__ = True # use field defaults instead of random values
return ExtractionTemplateFactory.build().model_dump_json(indent=2) # type: ignore
else:
raise ValueError(f"Unsupported template type: {type(template)}")
@classmethod
def get_default_options(cls) -> BaseOptions:
return VlmExtractionPipelineOptions()

3
pyproject.toml
View File

@@ -71,6 +71,7 @@ dependencies = [
# 'scipy (>=1.6.0,<2.0.0) ; python_version >= "3.10"',
# 'scipy (>=1.6.0,<1.14.0) ; python_version < "3.10"',
"accelerate>=1.0.0,<2",
"polyfactory>=2.22.2",
]
[project.urls]
@@ -94,6 +95,7 @@ vlm = [
'accelerate (>=1.2.1,<2.0.0)',
'mlx-vlm (>=0.3.0,<1.0.0) ; python_version >= "3.10" and sys_platform == "darwin" and platform_machine == "arm64"',
'vllm (>=0.10.0,<1.0.0) ; python_version >= "3.10" and sys_platform == "linux" and platform_machine == "x86_64"',
"qwen-vl-utils>=0.0.11",
]
rapidocr = [
'rapidocr (>=3.3,<4.0.0) ; python_version < "3.14"',
@@ -255,6 +257,7 @@ module = [
"transformers.*",
"pylatexenc.*",
"vllm.*",
"qwen_vl_utils.*",
]
ignore_missing_imports = true

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108
tests/test_extraction.py Normal file
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"""
Test unit for document extraction functionality.
"""
import os
from pathlib import Path
import pytest
from pydantic import BaseModel, Field
from docling.datamodel.base_models import InputFormat
from docling.document_converter import DocumentConverter
from docling.document_extractor import DocumentExtractor
IS_CI = bool(os.getenv("CI"))
class ExampleTemplate(BaseModel):
bill_no: str = Field(
examples=["A123", "5414"]
) # provide some examples, but not the actual value of the test sample
total: float = Field(
default=10.0, examples=[20.0]
) # provide a default value and some examples
@pytest.fixture
def extractor() -> DocumentExtractor:
"""Create a document converter instance for testing."""
return DocumentExtractor(allowed_formats=[InputFormat.IMAGE, InputFormat.PDF])
@pytest.fixture
def test_file_path() -> Path:
"""Get the path to the test QR bill image."""
return Path(__file__).parent / "data_scanned" / "qr_bill_example.jpg"
# return Path("tests/data/pdf/code_and_formula.pdf")
@pytest.mark.skipif(
IS_CI, reason="Skipping test in CI because the dataset is too heavy."
)
def test_extraction_with_string_template(
extractor: DocumentExtractor, test_file_path: Path
) -> None:
"""Test extraction using string template."""
str_templ = '{"bill_no": "string", "total": "number"}'
result = extractor.extract(test_file_path, template=str_templ)
print(result.pages)
assert result.status is not None
assert len(result.pages) == 1
assert result.pages[0].extracted_data["bill_no"] == "3139"
assert result.pages[0].extracted_data["total"] == 3949.75
@pytest.mark.skipif(
IS_CI, reason="Skipping test in CI because the dataset is too heavy."
)
def test_extraction_with_dict_template(
extractor: DocumentExtractor, test_file_path: Path
) -> None:
"""Test extraction using dictionary template."""
dict_templ = {
"bill_no": "string",
"total": "number",
}
result = extractor.extract(test_file_path, template=dict_templ)
assert len(result.pages) == 1
assert result.pages[0].extracted_data["bill_no"] == "3139"
assert result.pages[0].extracted_data["total"] == 3949.75
@pytest.mark.skipif(
IS_CI, reason="Skipping test in CI because the dataset is too heavy."
)
def test_extraction_with_pydantic_instance_template(
extractor: DocumentExtractor, test_file_path: Path
) -> None:
"""Test extraction using pydantic instance template."""
pydantic_instance_templ = ExampleTemplate(bill_no="4321")
result = extractor.extract(test_file_path, template=pydantic_instance_templ)
assert len(result.pages) == 1
assert result.pages[0].extracted_data["bill_no"] == "3139"
assert result.pages[0].extracted_data["total"] == 3949.75
@pytest.mark.skipif(
IS_CI, reason="Skipping test in CI because the dataset is too heavy."
)
def test_extraction_with_pydantic_class_template(
extractor: DocumentExtractor, test_file_path: Path
) -> None:
"""Test extraction using pydantic class template."""
pydantic_class_templ = ExampleTemplate
result = extractor.extract(test_file_path, template=pydantic_class_templ)
assert len(result.pages) == 1
assert result.pages[0].extracted_data["bill_no"] == "3139"
assert result.pages[0].extracted_data["total"] == 3949.75

97
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