Unstructured

本笔记本介绍了如何使用 Unstructured 文档加载器加载多种类型的文件。Unstructured 目前支持加载文本文件、PowerPoint、HTML、PDF、图像等。

有关在本地设置 Unstructured 的更多说明，包括设置所需的系统依赖项，请参阅本指南。

概述

集成详情

类	包	本地	可序列化	JS 支持
UnstructuredLoader	langchain_unstructured	✅	❌	✅

加载器功能

来源	文档延迟加载	原生异步支持
UnstructuredLoader	✅	❌

设置

凭证

默认情况下，langchain-unstructured 安装一个较小的占用空间，需要将分区逻辑卸载到 Unstructured API，这需要 API 密钥。如果使用本地安装，则不需要 API 密钥。要获取您的 API 密钥，请访问此站点并获取 API 密钥，然后在下面的单元格中设置它

import getpass
import os

if "UNSTRUCTURED_API_KEY" not in os.environ:
    os.environ["UNSTRUCTURED_API_KEY"] = getpass.getpass(
        "Enter your Unstructured API key: "
    )

安装

正常安装

运行本笔记本的其余部分需要以下软件包。

# Install package, compatible with API partitioning
%pip install --upgrade --quiet langchain-unstructured unstructured-client unstructured "unstructured[pdf]" python-magic

本地安装

如果您想在本地运行分区逻辑，则需要安装系统依赖项的组合，如此处 Unstructured 文档中所述。

例如，在 Mac 上，您可以使用以下命令安装所需的依赖项

# base dependencies
brew install libmagic poppler tesseract

# If parsing xml / html documents:
brew install libxml2 libxslt

您可以使用以下命令安装本地所需的 pip 依赖项

pip install "langchain-unstructured[local]"

初始化

UnstructuredLoader 允许从各种不同的文件类型加载。要详细了解 unstructured 包，请参阅其文档/。在本示例中，我们将展示如何从文本文件和 PDF 文件加载。

from langchain_unstructured import UnstructuredLoader

file_paths = [
    "./example_data/layout-parser-paper.pdf",
    "./example_data/state_of_the_union.txt",
]


loader = UnstructuredLoader(file_paths)

API 参考：UnstructuredLoader

加载

docs = loader.load()

docs[0]

INFO: pikepdf C++ to Python logger bridge initialized

Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((16.34, 213.36), (16.34, 253.36), (36.34, 253.36), (36.34, 213.36)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': 'd3ce55f220dfb75891b4394a18bcb973'}, page_content='1 2 0 2')

print(docs[0].metadata)

{'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((16.34, 213.36), (16.34, 253.36), (36.34, 253.36), (36.34, 213.36)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': 'd3ce55f220dfb75891b4394a18bcb973'}

延迟加载

pages = []
for doc in loader.lazy_load():
    pages.append(doc)

pages[0]

Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((16.34, 213.36), (16.34, 253.36), (36.34, 253.36), (36.34, 213.36)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': 'd3ce55f220dfb75891b4394a18bcb973'}, page_content='1 2 0 2')

后处理

如果您需要在提取后对 unstructured 元素进行后处理，则可以在实例化 UnstructuredLoader 时将 str -> str 函数列表传递给 post_processors kwarg。这同样适用于其他 Unstructured 加载器。下面是一个示例。

from langchain_unstructured import UnstructuredLoader
from unstructured.cleaners.core import clean_extra_whitespace

loader = UnstructuredLoader(
    "./example_data/layout-parser-paper.pdf",
    post_processors=[clean_extra_whitespace],
)

docs = loader.load()

docs[5:10]

API 参考：UnstructuredLoader

[Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((16.34, 393.9), (16.34, 560.0), (36.34, 560.0), (36.34, 393.9)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'parent_id': '89565df026a24279aaea20dc08cedbec', 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': 'e9fa370aef7ee5c05744eb7bb7d9981b'}, page_content='2 v 8 4 3 5 1 . 3 0 1 2 : v i X r a'),
 Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((157.62199999999999, 114.23496279999995), (157.62199999999999, 146.5141628), (457.7358962799999, 146.5141628), (457.7358962799999, 114.23496279999995)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'filetype': 'application/pdf', 'category': 'Title', 'element_id': 'bde0b230a1aa488e3ce837d33015181b'}, page_content='LayoutParser: A Unified Toolkit for Deep Learning Based Document Image Analysis'),
 Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((134.809, 168.64029940800003), (134.809, 192.2517444), (480.5464199080001, 192.2517444), (480.5464199080001, 168.64029940800003)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'parent_id': 'bde0b230a1aa488e3ce837d33015181b', 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': '54700f902899f0c8c90488fa8d825bce'}, page_content='Zejiang Shen1 ((cid:0)), Ruochen Zhang2, Melissa Dell3, Benjamin Charles Germain Lee4, Jacob Carlson3, and Weining Li5'),
 Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((207.23000000000002, 202.57205439999996), (207.23000000000002, 311.8195408), (408.12676, 311.8195408), (408.12676, 202.57205439999996)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'page_number': 1, 'parent_id': 'bde0b230a1aa488e3ce837d33015181b', 'filetype': 'application/pdf', 'category': 'UncategorizedText', 'element_id': 'b650f5867bad9bb4e30384282c79bcfe'}, page_content='1 Allen Institute for AI [email protected] 2 Brown University ruochen [email protected] 3 Harvard University {melissadell,jacob carlson}@fas.harvard.edu 4 University of Washington [email protected] 5 University of Waterloo [email protected]'),
 Document(metadata={'source': './example_data/layout-parser-paper.pdf', 'coordinates': {'points': ((162.779, 338.45008160000003), (162.779, 566.8455408), (454.0372021523199, 566.8455408), (454.0372021523199, 338.45008160000003)), 'system': 'PixelSpace', 'layout_width': 612, 'layout_height': 792}, 'file_directory': './example_data', 'filename': 'layout-parser-paper.pdf', 'languages': ['eng'], 'last_modified': '2024-02-27T15:49:27', 'links': [{'text': ':// layout - parser . github . io', 'url': 'https://layout-parser.github.io', 'start_index': 1477}], 'page_number': 1, 'parent_id': 'bde0b230a1aa488e3ce837d33015181b', 'filetype': 'application/pdf', 'category': 'NarrativeText', 'element_id': 'cfc957c94fe63c8fd7c7f4bcb56e75a7'}, page_content='Abstract. Recent advances in document image analysis (DIA) have been primarily driven by the application of neural networks. Ideally, research outcomes could be easily deployed in production and extended for further investigation. However, various factors like loosely organized codebases and sophisticated model configurations complicate the easy reuse of im- portant innovations by a wide audience. Though there have been on-going efforts to improve reusability and simplify deep learning (DL) model development in disciplines like natural language processing and computer vision, none of them are optimized for challenges in the domain of DIA. This represents a major gap in the existing toolkit, as DIA is central to academic research across a wide range of disciplines in the social sciences and humanities. This paper introduces LayoutParser, an open-source library for streamlining the usage of DL in DIA research and applica- tions. The core LayoutParser library comes with a set of simple and intuitive interfaces for applying and customizing DL models for layout de- tection, character recognition, and many other document processing tasks. To promote extensibility, LayoutParser also incorporates a community platform for sharing both pre-trained models and full document digiti- zation pipelines. We demonstrate that LayoutParser is helpful for both lightweight and large-scale digitization pipelines in real-word use cases. The library is publicly available at https://layout-parser.github.io.')]

Unstructured API

如果想要使用较小的包启动并运行，并获得最新的分区，可以 pip install unstructured-client 和 pip install langchain-unstructured。有关 UnstructuredLoader 的更多信息，请参阅Unstructured 提供商页面。

当您传入 api_key 并设置 partition_via_api=True 时，加载器将使用托管的 Unstructured 无服务器 API 处理您的文档。您可以在此处生成免费的 Unstructured API 密钥。

如果您想自托管 Unstructured API 或在本地运行它，请查看此处的说明。

from langchain_unstructured import UnstructuredLoader

loader = UnstructuredLoader(
    file_path="example_data/fake.docx",
    api_key=os.getenv("UNSTRUCTURED_API_KEY"),
    partition_via_api=True,
)

docs = loader.load()
docs[0]

API 参考：UnstructuredLoader

INFO: Preparing to split document for partition.
INFO: Given file doesn't have '.pdf' extension, so splitting is not enabled.
INFO: Partitioning without split.
INFO: Successfully partitioned the document.

Document(metadata={'source': 'example_data/fake.docx', 'category_depth': 0, 'filename': 'fake.docx', 'languages': ['por', 'cat'], 'filetype': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'category': 'Title', 'element_id': '56d531394823d81787d77a04462ed096'}, page_content='Lorem ipsum dolor sit amet.')

您还可以使用 UnstructuredLoader 在单个 API 中通过 Unstructured API 批量处理多个文件。

loader = UnstructuredLoader(
    file_path=["example_data/fake.docx", "example_data/fake-email.eml"],
    api_key=os.getenv("UNSTRUCTURED_API_KEY"),
    partition_via_api=True,
)

docs = loader.load()

print(docs[0].metadata["filename"], ": ", docs[0].page_content[:100])
print(docs[-1].metadata["filename"], ": ", docs[-1].page_content[:100])

INFO: Preparing to split document for partition.
INFO: Given file doesn't have '.pdf' extension, so splitting is not enabled.
INFO: Partitioning without split.
INFO: Successfully partitioned the document.
INFO: Preparing to split document for partition.
INFO: Given file doesn't have '.pdf' extension, so splitting is not enabled.
INFO: Partitioning without split.
INFO: Successfully partitioned the document.
``````output
fake.docx :  Lorem ipsum dolor sit amet.
fake-email.eml :  Violets are blue

Unstructured SDK 客户端

使用 Unstructured API 进行分区依赖于 Unstructured SDK 客户端。

如果您想自定义客户端，您必须将一个 UnstructuredClient 实例传递给 UnstructuredLoader。以下示例展示了如何自定义客户端的功能，例如使用您自己的 requests.Session()、传递备用的 server_url 以及自定义 RetryConfig 对象。有关自定义客户端或 sdk 客户端接受的其他参数的更多信息，请参阅 Unstructured Python SDK 文档和 API 参数文档的客户端部分。请注意，所有 API 参数都应该传递给 UnstructuredLoader。

警告： 下面的示例可能未使用最新版本的 UnstructuredClient，并且未来版本可能会有重大更改。有关最新示例，请参阅 Unstructured Python SDK 文档。

import requests
from langchain_unstructured import UnstructuredLoader
from unstructured_client import UnstructuredClient
from unstructured_client.utils import BackoffStrategy, RetryConfig

client = UnstructuredClient(
    api_key_auth=os.getenv(
        "UNSTRUCTURED_API_KEY"
    ),  # Note: the client API param is "api_key_auth" instead of "api_key"
    client=requests.Session(),  # Define your own requests session
    server_url="https://api.unstructuredapp.io/general/v0/general",  # Define your own api url
    retry_config=RetryConfig(
        strategy="backoff",
        retry_connection_errors=True,
        backoff=BackoffStrategy(
            initial_interval=500,
            max_interval=60000,
            exponent=1.5,
            max_elapsed_time=900000,
        ),
    ),  # Define your own retry config
)

loader = UnstructuredLoader(
    "./example_data/layout-parser-paper.pdf",
    partition_via_api=True,
    client=client,
    split_pdf_page=True,
    split_pdf_page_range=[1, 10],
)

docs = loader.load()

print(docs[0].metadata["filename"], ": ", docs[0].page_content[:100])

API 参考：UnstructuredLoader

INFO: Preparing to split document for partition.
INFO: Concurrency level set to 5
INFO: Splitting pages 1 to 10 (10 total)
INFO: Determined optimal split size of 2 pages.
INFO: Partitioning 5 files with 2 page(s) each.
INFO: Partitioning set #1 (pages 1-2).
INFO: Partitioning set #2 (pages 3-4).
INFO: Partitioning set #3 (pages 5-6).
INFO: Partitioning set #4 (pages 7-8).
INFO: Partitioning set #5 (pages 9-10).
INFO: HTTP Request: POST https://api.unstructuredapp.io/general/v0/general "HTTP/1.1 200 OK"
INFO: HTTP Request: POST https://api.unstructuredapp.io/general/v0/general "HTTP/1.1 200 OK"
INFO: HTTP Request: POST https://api.unstructuredapp.io/general/v0/general "HTTP/1.1 200 OK"
INFO: HTTP Request: POST https://api.unstructuredapp.io/general/v0/general "HTTP/1.1 200 OK"
INFO: Successfully partitioned set #1, elements added to the final result.
INFO: Successfully partitioned set #2, elements added to the final result.
INFO: Successfully partitioned set #3, elements added to the final result.
INFO: Successfully partitioned set #4, elements added to the final result.
INFO: Successfully partitioned set #5, elements added to the final result.
INFO: Successfully partitioned the document.
``````output
layout-parser-paper.pdf :  LayoutParser: A Unified Toolkit for Deep Learning Based Document Image Analysis

分块

与旧的加载器 UnstructuredFileLoader 等不同，UnstructuredLoader 不支持使用 mode 作为参数进行文本分组。它改为支持“分块”。Unstructured 中的分块与其他您可能熟悉的基于纯文本特征（例如“\n\n”或“\n”之类的字符序列，可能表示段落边界或列表项边界）形成块的分块机制不同。相反，所有文档都使用关于每种文档格式的特定知识进行拆分，以便将文档划分为语义单元（文档元素），并且只有当单个元素超过所需的最大块大小时，我们才需要求助于文本拆分。一般来说，分块会组合连续的元素，形成尽可能大的块，而不会超过最大块大小。分块会生成一系列 CompositeElement、Table 或 TableChunk 元素。每个“块”都是这三种类型中的一种的实例。

请参阅此页面，了解有关分块选项的更多详细信息，但要重现与 mode="single" 相同的行为，您可以设置 chunking_strategy="basic"、max_characters=<某个很大的数字> 和 include_orig_elements=False。

from langchain_unstructured import UnstructuredLoader

loader = UnstructuredLoader(
    "./example_data/layout-parser-paper.pdf",
    chunking_strategy="basic",
    max_characters=1000000,
    include_orig_elements=False,
)

docs = loader.load()

print("Number of LangChain documents:", len(docs))
print("Length of text in the document:", len(docs[0].page_content))

API 参考：UnstructuredLoader

Number of LangChain documents: 1
Length of text in the document: 42772

加载网页

当在本地运行时，UnstructuredLoader 接受一个 web_url kwarg，该 kwarg 会填充底层 Unstructured partition 的 url 参数。这允许解析远程托管的文档，例如 HTML 网页。

使用示例

from langchain_unstructured import UnstructuredLoader

loader = UnstructuredLoader(web_url="https://www.example.com")
docs = loader.load()

for doc in docs:
    print(f"{doc}\n")

API 参考：UnstructuredLoader

page_content='Example Domain' metadata={'category_depth': 0, 'languages': ['eng'], 'filetype': 'text/html', 'url': 'https://www.example.com', 'category': 'Title', 'element_id': 'fdaa78d856f9d143aeeed85bf23f58f8'}

page_content='This domain is for use in illustrative examples in documents. You may use this domain in literature without prior coordination or asking for permission.' metadata={'languages': ['eng'], 'parent_id': 'fdaa78d856f9d143aeeed85bf23f58f8', 'filetype': 'text/html', 'url': 'https://www.example.com', 'category': 'NarrativeText', 'element_id': '3652b8458b0688639f973fe36253c992'}

page_content='More information...' metadata={'category_depth': 0, 'link_texts': ['More information...'], 'link_urls': ['https://www.iana.org/domains/example'], 'languages': ['eng'], 'filetype': 'text/html', 'url': 'https://www.example.com', 'category': 'Title', 'element_id': '793ab98565d6f6d6f3a6d614e3ace2a9'}

API 参考

有关所有 UnstructuredLoader 功能和配置的详细文档，请访问 API 参考： https://python.langchain.ac.cn/api_reference/unstructured/document_loaders/langchain_unstructured.document_loaders.UnstructuredLoader.html

相关内容

• 文档加载器概念指南
• 文档加载器操作指南