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Description:

semanticchunker 0.1.0

semantic-chunker
This library is built on top of the semantic-text-splitter
library, written in Rust, combining it with
the tree-sitter-language-pack
to enable code-splitting.
Its main utility is in providing a strongly typed interface to the underlying library and removing the need for
managing
tree-sitter dependencies.
Installation
pip install semantic-chunker

Or to include the optional tokenizers dependency:
pip install semantic-chunker[tokenizers]

Usage
Import the get_chunker function from the semantic_chunker module, and use it to get a chunker instance and chunk
content. You can chunk plain text:
from semantic_chunker import get_chunker

plain_text = """
Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin
literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney
College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage,
and going through the cites of the word in classical literature, discovered the undoubtable source: Lorem Ipsum
comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by
Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance.
The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section
"""

chunker = get_chunker(
"gpt-3.5-turbo",
chunking_type="text", # required
max_tokens=10, # required
trim=False, # default True
overlap=5, # default 0
)

# Then use it to chunk a value into either a list of chunks that are up to the `max_tokens` length:
chunks = chunker.chunks(plain_text) # list[str]

# Or a list of tuples containing the character offset indices and the chunk:
chunks_with_incides = chunker.chunk_with_indices(plain_text) # list[tuple[str, int]]

Markdown:
from semantic_chunker import get_chunker

markdown_text = """
# Lorem Ipsum Intro

Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature
from 45 BC, making it over 2000 years old.

Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin
words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature,
discovered the undoubtable source: Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum"
(The Extremes of Good and Evil) by Cicero, written in 45 BC.
This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum,
"Lorem ipsum dolor sit amet..", comes from a line in section.
"""

chunker = get_chunker(
"gpt-3.5-turbo",
chunking_type="markdown", # required
max_tokens=10, # required
trim=False, # default True
overlap=5, # default 0
)

# Then use it to chunk a value into either a list of chunks that are up to the `max_tokens` length:
chunks = chunker.chunks(markdown_text) # list[str]

# Or a list of tuples containing the character offset indices and the chunk:
chunks_with_incides = chunker.chunk_with_indices(markdown_text) # list[tuple[str, int]]

Or code:
from semantic_chunker import get_chunker

kotlin_snippet = """
import kotlin.random.Random

fun main() {
val randomNumbers = IntArray(10) { Random.nextInt(1, 100) } // Generate an array of 10 random integers between 1 and 99
println("Random numbers:")
for (number in randomNumbers) {
println(number) // Print each random number
}
}
"""

chunker = get_chunker(
"gpt-3.5-turbo",
chunking_type="code", # required
max_tokens=10, # required
language="kotlin", # required, only for code chunking, ignored otherwise
trim=False, # default True
overlap=5, # default 0
)

# Then use it to chunk a value into either a list of chunks that are up to the `max_tokens` length:
chunks = chunker.chunks(kotlin_snippet) # list[str]

# Or a list of tuples containing the character offset indices and the chunk:
chunks_with_incides = chunker.chunk_with_indices(kotlin_snippet) # list[tuple[str, int]]

The first argument to get_chunker is a required argument (not kwarg), which can be one of the following:

a tiktoken model string identifier (e.g. gpt-3.5-turbo etc.)
a callback function that receives a text (string) and returns the number of tokens it contains (integer.)
a tokenizers.Tokenizer instance (or an instance of a subclass thereof).
a file path to a tokenizer JSON file as a string ("/path/to/tokenizer.json") or Path
instance (Path("/path/to/tokenizer.json"))

The (required) kwarg chunking_type can be either text, markdown or code.
The (required) kwarg max_tokens is the maximum number of tokens in each chunk. This kwarg accepts either an _
integer_ or a tuple of two integers (tuple[int,int]), which represents a min/max range within which the number
of tokens in each chunk should fall.
If the chunking_type is code, the language kwarg is required. This kwarg should be a string representing the
language of the code to be split. The language should be one of the languages included in the
the tree-sitter-language-pack library,
(see here for a list).
Note on Types
The semantic-text-splitter library is used to split the text into chunks (
very fast). It has 3 types of splitters: TextSplitter, MarkdownSplitter, and CodeSplitter. This is abstracted by
this library into a protocol type named SemanticChunker:
from typing import Protocol

class SemanticChunker(Protocol):
def chunks(self, content: str) -> list[str]:
"""Generate a list of chunks from a given text. Each chunk will be up to the `capacity`."""

def chunk_with_indices(self, content: str) -> list[tuple[int, str]]:
"""Generate a list of chunks from a given text, along with their character offsets in the original text. Each chunk will be up to the `capacity`."""

Contribution
This library welcomes contributions. To contribute, please follow the steps below:

Fork and clone the repository.
Make changes and commit them (follow conventional commits).
Submit a PR.

Read below on how to develop locally:
Prerequisites

A compatible Python version.
pdm installed.
pre-commit installed.

Setup

Inside the repository, install the dependencies with:

pdm install

This will create a virtual env under the git ignored .venv folder and install all the dependencies.

Install the pre-commit hooks:

pre-commit install && pre-commit install --hook-type commit-msg

This will install the pre-commit hooks that will run before every commit. This includes linters and formatters.
Linting
To lint the codebase, run:
pdm run lint

Testing
To run the tests, run:
pdm run test

Updating Dependencies
To update the dependencies, run:
pdm update