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### Summary Allows users to pass in `**unstructured_kwargs` to Unstructured document loaders. Implemented with the `strategy` kwargs in mind, but will pass in other kwargs like `include_page_breaks` as well. The two currently supported strategies are `"hi_res"`, which is more accurate but takes longer, and `"fast"`, which processes faster but with lower accuracy. The `"hi_res"` strategy is the default. For PDFs, if `detectron2` is not available and the user selects `"hi_res"`, the loader will fallback to using the `"fast"` strategy. ### Testing #### Make sure the `strategy` kwarg works Run the following in iPython to verify that the `"fast"` strategy is indeed faster. ```python from langchain.document_loaders import UnstructuredFileLoader loader = UnstructuredFileLoader("layout-parser-paper-fast.pdf", strategy="fast", mode="elements") %timeit loader.load() loader = UnstructuredFileLoader("layout-parser-paper-fast.pdf", mode="elements") %timeit loader.load() ``` On my system I get: ```python In [3]: from langchain.document_loaders import UnstructuredFileLoader In [4]: loader = UnstructuredFileLoader("layout-parser-paper-fast.pdf", strategy="fast", mode="elements") In [5]: %timeit loader.load() 247 ms ± 369 µs per loop (mean ± std. dev. of 7 runs, 1 loop each) In [6]: loader = UnstructuredFileLoader("layout-parser-paper-fast.pdf", mode="elements") In [7]: %timeit loader.load() 2.45 s ± 31 ms per loop (mean ± std. dev. of 7 runs, 1 loop each) ``` #### Make sure older versions of `unstructured` still work Run `pip install unstructured==0.5.3` and then verify the following runs without error: ```python from langchain.document_loaders import UnstructuredFileLoader loader = UnstructuredFileLoader("layout-parser-paper-fast.pdf", mode="elements") loader.load() ``` |
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README.md
🦜️🔗 LangChain
⚡ Building applications with LLMs through composability ⚡
Production Support: As you move your LangChains into production, we'd love to offer more comprehensive support. Please fill out this form and we'll set up a dedicated support Slack channel.
Quick Install
pip install langchain
🤔 What is this?
Large language models (LLMs) are emerging as a transformative technology, enabling developers to build applications that they previously could not. But using these LLMs in isolation is often not enough to create a truly powerful app - the real power comes when you can combine them with other sources of computation or knowledge.
This library is aimed at assisting in the development of those types of applications. Common examples of these types of applications include:
❓ Question Answering over specific documents
- Documentation
- End-to-end Example: Question Answering over Notion Database
💬 Chatbots
- Documentation
- End-to-end Example: Chat-LangChain
🤖 Agents
- Documentation
- End-to-end Example: GPT+WolframAlpha
📖 Documentation
Please see here for full documentation on:
- Getting started (installation, setting up the environment, simple examples)
- How-To examples (demos, integrations, helper functions)
- Reference (full API docs)
- Resources (high-level explanation of core concepts)
🚀 What can this help with?
There are six main areas that LangChain is designed to help with. These are, in increasing order of complexity:
📃 LLMs and Prompts:
This includes prompt management, prompt optimization, generic interface for all LLMs, and common utilities for working with LLMs.
🔗 Chains:
Chains go beyond just a single LLM call, and are sequences of calls (whether to an LLM or a different utility). LangChain provides a standard interface for chains, lots of integrations with other tools, and end-to-end chains for common applications.
📚 Data Augmented Generation:
Data Augmented Generation involves specific types of chains that first interact with an external datasource to fetch data to use in the generation step. Examples of this include summarization of long pieces of text and question/answering over specific data sources.
🤖 Agents:
Agents involve an LLM making decisions about which Actions to take, taking that Action, seeing an Observation, and repeating that until done. LangChain provides a standard interface for agents, a selection of agents to choose from, and examples of end to end agents.
🧠 Memory:
Memory is the concept of persisting state between calls of a chain/agent. LangChain provides a standard interface for memory, a collection of memory implementations, and examples of chains/agents that use memory.
🧐 Evaluation:
[BETA] Generative models are notoriously hard to evaluate with traditional metrics. One new way of evaluating them is using language models themselves to do the evaluation. LangChain provides some prompts/chains for assisting in this.
For more information on these concepts, please see our full documentation.
💁 Contributing
As an open source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infra, or better documentation.
For detailed information on how to contribute, see here.