textsplitter

Documentation

Overview

Package textsplitter provides tools for splitting long texts into smaller chunks based on configurable rules and parameters. It aims to help in processing these chunks more efficiently when interacting with language models or other text-processing tools.

The main components of this package are:

- TextSplitter interface: a common interface for splitting texts into smaller chunks. - RecursiveCharacter: a text splitter that recursively splits texts by different characters (separators) combined with chunk size and overlap settings. - Helper functions: utility functions for creating documents out of split texts and rejoining them if necessary.

Using the TextSplitter interface, developers can implement custom splitting strategies for their specific use cases and requirements.

Index

• Constants
• Variables
• func CreateDocuments(textSplitter TextSplitter, texts []string, metadatas []map[string]any) ([]schema.Document, error)
• func SplitDocuments(textSplitter TextSplitter, documents []schema.Document) ([]schema.Document, error)
• type RecursiveCharacter
  • func NewRecursiveCharacter() RecursiveCharacter
  • func (s RecursiveCharacter) SplitText(text string) ([]string, error)
• type SentenceSplitter
  • func NewSentenceSplitter(chunkSize, chunkOverlap int) *SentenceSplitter
  • func (s *SentenceSplitter) ChunkingTokenizerFn() func(string) []string
  • func (s *SentenceSplitter) SplitByChar() func(string) []string
  • func (s *SentenceSplitter) SplitByRegex(regex string) func(string) []string
  • func (s *SentenceSplitter) SplitBySep(sep string, keepSep bool) func(string) []string
  • func (s *SentenceSplitter) SplitText(text string) []string
  • func (s *SentenceSplitter) SplitTextMetadataAware(text, metadataStr string) []string
  • func (s *SentenceSplitter) TokenEncode(text string) []int
• type Split
• type TextSplitter
• type TokenSplitter
  • func NewTokenSplitter() TokenSplitter
  • func (s TokenSplitter) SplitText(text string) ([]string, error)

Constants

const CHUNKING_REGEX = "[^,.;。]+[,.;。]?"

const DEFUALT_PARAGRAPH_SEP = "\n\n\n"

const TokenEncoding = "cl100k_base"

Variables

var AllowedSpecial = []string{}

var DisallowedSpecial = []string{"all"}

var ErrMismatchMetadatasAndText = errors.New("number of texts and metadatas does not match")

ErrMismatchMetadatasAndText is returned when the number of texts and metadatas given to CreateDocuments does not match. The function will not error if the length of the metadatas slice is zero.

Functions

func CreateDocuments

func CreateDocuments(textSplitter TextSplitter, texts []string, metadatas []map[string]any) ([]schema.Document, error)

CreateDocuments creates documents from texts and metadatas with a text splitter. If the length of the metadatas is zero, the result documents will contain no metadata. Otherwise the numbers of texts and metadatas must match.

func SplitDocuments

func SplitDocuments(textSplitter TextSplitter, documents []schema.Document) ([]schema.Document, error)

SplitDocuments splits documents using a textsplitter.

Types

type RecursiveCharacter

type RecursiveCharacter struct {
	Separators   []string
	ChunkSize    int
	ChunkOverlap int
}

RecursiveCharacter is a text splitter that will split texts recursively by different characters.

func NewRecursiveCharacter

func NewRecursiveCharacter() RecursiveCharacter

NewRecursiveCharacter creates a new recursive character splitter with default values. By default the separators used are "\n\n", "\n", " " and "". The chunk size is set to 4000 and chunk overlap is set to 200.

func (RecursiveCharacter) SplitText

func (s RecursiveCharacter) SplitText(text string) ([]string, error)

SplitText splits a text into multiple text.

type SentenceSplitter

type SentenceSplitter struct {
	ChunkSize              int
	ChunkOverlap           int
	Separator              string
	ParagraphSeparator     string
	SecondaryChunkingRegex string

	Tokenizer *tiktoken.Tiktoken
	// contains filtered or unexported fields
}

SentenceSplitter splits text into chunks with a preference for complete sentences.

func NewSentenceSplitter

func NewSentenceSplitter(chunkSize, chunkOverlap int) *SentenceSplitter

NewSentenceSplitter creates a new SentenceSplitter instance.

func (*SentenceSplitter) ChunkingTokenizerFn

func (s *SentenceSplitter) ChunkingTokenizerFn() func(string) []string

func (*SentenceSplitter) SplitByChar

func (s *SentenceSplitter) SplitByChar() func(string) []string

SplitByChar splits text by character.

func (*SentenceSplitter) SplitByRegex

func (s *SentenceSplitter) SplitByRegex(regex string) func(string) []string

SplitByRegex splits text by regex.

func (*SentenceSplitter) SplitBySep

func (s *SentenceSplitter) SplitBySep(sep string, keepSep bool) func(string) []string

SplitBySep splits text by separator.

func (*SentenceSplitter) SplitText

func (s *SentenceSplitter) SplitText(text string) []string

SplitText splits text into chunks.

func (*SentenceSplitter) SplitTextMetadataAware

func (s *SentenceSplitter) SplitTextMetadataAware(text, metadataStr string) []string

SplitTextMetadataAware splits text with metadata into chunks.

func (*SentenceSplitter) TokenEncode

func (s *SentenceSplitter) TokenEncode(text string) []int

type Split

type Split struct {
	Text       string
	IsSentence bool
}

Split represents a text split.

type TextSplitter

type TextSplitter interface {
	SplitText(string) ([]string, error)
}

TextSplitter is the standard interface for splitting texts.

type TokenSplitter

type TokenSplitter struct {
	ChunkSize         int
	ChunkOverlap      int
	ModelName         string
	EncodingName      string
	AllowedSpecial    []string
	DisallowedSpecial []string
}

TokenSplitter is a text splitter that will split texts by tokens.

func NewTokenSplitter

func NewTokenSplitter() TokenSplitter

func (TokenSplitter) SplitText

func (s TokenSplitter) SplitText(text string) ([]string, error)

SplitText splits a text into multiple text.