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ReStructuredText
76 lines
2.9 KiB
ReStructuredText
Text Splitters
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==========================
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.. note::
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`Conceptual Guide <https://docs.langchain.com/docs/components/indexing/text-splitters>`_
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When you want to deal with long pieces of text, it is necessary to split up that text into chunks.
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As simple as this sounds, there is a lot of potential complexity here. Ideally, you want to keep the semantically related pieces of text together. What "semantically related" means could depend on the type of text.
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This notebook showcases several ways to do that.
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At a high level, text splitters work as following:
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1. Split the text up into small, semantically meaningful chunks (often sentences).
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2. Start combining these small chunks into a larger chunk until you reach a certain size (as measured by some function).
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3. Once you reach that size, make that chunk its own piece of text and then start creating a new chunk of text with some overlap (to keep context between chunks).
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That means there are two different axes along which you can customize your text splitter:
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1. How the text is split
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2. How the chunk size is measured
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For an introduction to the default text splitter and generic functionality see:
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.. toctree::
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:maxdepth: 1
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:glob:
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./text_splitters/getting_started.ipynb
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Usage examples for the text splitters:
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- `Character <./text_splitters/examples/character_text_splitter.html>`_
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- `LaTeX <./text_splitters/examples/latex.html>`_
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- `Markdown <./text_splitters/examples/markdown.html>`_
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- `NLTK <./text_splitters/examples/nltk.html>`_
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- `Python code <./text_splitters/examples/python.html>`_
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- `Recursive Character <./text_splitters/examples/recursive_text_splitter.html>`_
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- `spaCy <./text_splitters/examples/spacy.html>`_
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- `tiktoken (OpenAI) <./text_splitters/examples/tiktoken_splitter.html>`_
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.. toctree::
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:maxdepth: 1
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:caption: Text Splitters
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:name: text_splitters
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:hidden:
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./text_splitters/examples/character_text_splitter.ipynb
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./text_splitters/examples/latex.ipynb
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./text_splitters/examples/markdown.ipynb
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./text_splitters/examples/nltk.ipynb
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./text_splitters/examples/python.ipynb
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./text_splitters/examples/recursive_text_splitter.ipynb
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./text_splitters/examples/spacy.ipynb
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./text_splitters/examples/tiktoken_splitter.ipynb
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Most LLMs are constrained by the number of tokens that you can pass in, which is not the same as the number of characters.
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In order to get a more accurate estimate, we can use tokenizers to count the number of tokens in the text.
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We use this number inside the `..TextSplitter` classes.
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This implemented as the `from_<tokenizer>` methods of the `..TextSplitter` classes:
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- `Hugging Face tokenizer <./text_splitters/examples/huggingface_length_function.html>`_
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- `tiktoken (OpenAI) tokenizer <./text_splitters/examples/tiktoken.html>`_
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.. toctree::
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:maxdepth: 1
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:caption: Text Splitters with Tokens
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:name: text_splitter_with_tokens
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:hidden:
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./text_splitters/examples/huggingface_length_function.ipynb
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./text_splitters/examples/tiktoken.ipynb |