wehub-resource-sync
c56bef871b
CodeQL / Analyze (python) (push) Has been cancelled
Update Platform Components Table / update (push) Has been cancelled
Docker image release / Build base image (push) Has been cancelled
Sync docs with Docusaurus / sync (push) Has been cancelled
Tests / Check if changed (push) Has been cancelled
Tests / format (push) Has been cancelled
Tests / check-imports (push) Has been cancelled
Tests / Unit / macos-latest (push) Has been cancelled
Tests / Unit / ubuntu-latest (push) Has been cancelled
Tests / Unit / windows-latest (push) Has been cancelled
Tests / mypy (push) Has been cancelled
Tests / Integration / ubuntu-latest (push) Has been cancelled
Tests / Integration / macos-latest (push) Has been cancelled
Tests / Integration / windows-latest (push) Has been cancelled
Tests / notify-slack-on-failure (push) Has been cancelled
Tests / Mark tests as completed (push) Has been cancelled
90 lines
6.3 KiB
Plaintext
90 lines
6.3 KiB
Plaintext
---
|
||
title: "HierarchicalDocumentSplitter"
|
||
id: hierarchicaldocumentsplitter
|
||
slug: "/hierarchicaldocumentsplitter"
|
||
description: "Use this component to create a multi-level document structure based on parent-children relationships between text segments."
|
||
---
|
||
|
||
# HierarchicalDocumentSplitter
|
||
|
||
Use this component to create a multi-level document structure based on parent-children relationships between text segments.
|
||
|
||
| | |
|
||
| -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
|
||
| **Most common position in a pipeline** | In indexing pipelines after [Converters](../converters.mdx) and [`DocumentCleaner`](documentcleaner.mdx) |
|
||
| **Mandatory init variables** | “block_sizes”: Set of block sizes to split the document into. The blocks are split in descending order. |
|
||
| **Mandatory run variables** | “documents”: A list of documents to split into hierarchical blocks |
|
||
| **Output variables** | “documents”: A list of hierarchical documents |
|
||
| **API reference** | [PreProcessors](/reference/preprocessors-api) |
|
||
| **GitHub link** | [https://github.com/deepset-ai/haystack/blob/dae8c7babaf28d2ffab4f2a8dedecd63e2394fb4/haystack/components/preprocessors/hierarchical_document_splitter.py](https://github.com/deepset-ai/haystack/blob/dae8c7babaf28d2ffab4f2a8dedecd63e2394fb4/haystack/components/preprocessors/hierarchical_document_splitter.py#L12) |
|
||
|
||
## Overview
|
||
|
||
The `HierarchicalDocumentSplitter` divides documents into blocks of different sizes, creating a tree-like structure.
|
||
|
||
A block is one of the chunks of text that the splitter produces. It is similar to cutting a long piece of text into smaller pieces: each piece is a block. Blocks form a tree structure where your full document is the root block, and as you split it into smaller and smaller pieces you get child-blocks and leaf-blocks, down to whatever smallest size specified.
|
||
|
||
The [`AutoMergingRetriever`](../retrievers/automergingretriever.mdx) component then leverages this hierarchical structure to improve document retrieval.
|
||
|
||
To initialize the component, you need to specify the `block_size`, which is the “maximum length” of each of the blocks, measured in the specific unit (see `split_by` parameter). Pass a set of sizes (for example, `{20, 5}`), and it will:
|
||
|
||
- First, split the document into blocks of up to 20 units each (the “parent” blocks).
|
||
- Then, it will split each of those into blocks of up to 5 units each (the “child” blocks).
|
||
|
||
This descending order of sizes builds the hierarchy.
|
||
|
||
These additional parameters can be set when the component is initialized:
|
||
|
||
- `split_by` can be `"word"` (default), `"sentence"`, `"passage"`, `"page"`.
|
||
- `split_overlap` is an integer indicating the number of overlapping words, sentences, or passages between chunks, 0 being the default.
|
||
|
||
## Usage
|
||
|
||
### On its own
|
||
|
||
```python
|
||
from haystack import Document
|
||
from haystack.components.preprocessors import HierarchicalDocumentSplitter
|
||
|
||
doc = Document(content="This is a simple test document")
|
||
splitter = HierarchicalDocumentSplitter(
|
||
block_sizes={3, 2},
|
||
split_overlap=0,
|
||
split_by="word",
|
||
)
|
||
splitter.run([doc])
|
||
```
|
||
|
||
### In a pipeline
|
||
|
||
This Haystack pipeline processes `.md` files by converting them to documents, cleaning the text, splitting it into sentence-based chunks, and storing the results in an In-Memory Document Store.
|
||
|
||
```python
|
||
from pathlib import Path
|
||
|
||
from haystack import Document
|
||
from haystack import Pipeline
|
||
from haystack.document_stores.in_memory import InMemoryDocumentStore
|
||
from haystack.components.converters.txt import TextFileToDocument
|
||
from haystack.components.preprocessors import DocumentCleaner
|
||
from haystack.components.preprocessors import HierarchicalDocumentSplitter
|
||
from haystack.components.writers import DocumentWriter
|
||
|
||
document_store = InMemoryDocumentStore()
|
||
|
||
Pipeline = Pipeline()
|
||
Pipeline.add_component(instance=TextFileToDocument(), name="text_file_converter")
|
||
Pipeline.add_component(instance=DocumentCleaner(), name="cleaner")
|
||
Pipeline.add_component(instance=HierarchicalDocumentSplitter(
|
||
block_sizes={10, 6, 3}, split_overlap=0, split_by="sentence", name="splitter"
|
||
)
|
||
Pipeline.add_component(instance=DocumentWriter(document_store=document_store), name="writer")
|
||
Pipeline.connect("text_file_converter.documents", "cleaner.documents")
|
||
Pipeline.connect("cleaner.documents", "splitter.documents")
|
||
Pipeline.connect("splitter.documents", "writer.documents")
|
||
|
||
path = "path/to/your/files"
|
||
files = list(Path(path).glob("*.md"))
|
||
Pipeline.run({"text_file_converter": {"sources": files}})
|
||
```
|