Word Segmentation Python Packages

sentencepiece

Unsupervised text tokenizer for Neural Network-based text generation.

pythainlp

Thai natural language processing in Python

symspellpy

Python port of SymSpell: 1 million times faster spelling correction & fuzzy search through Symmetric Delete spelling correction algorithm

kiwipiepy

Python API for Kiwi

kiwipiepy-model

Python API for Kiwi

nagisa

A Japanese tokenizer based on recurrent neural networks

pycantonese

Cantonese Linguistics and NLP

rustling

A high-performance library for computational linguistics

adaseq

AdaSeq: An All-in-One Library for Developing State-of-the-Art Sequence Understanding Models

youtokentome

Unsupervised text tokenizer focused on computational efficiency

wordseg

Word segmentation models

bi-lstm-crf

A PyTorch implementation of the BI-LSTM-CRF model.

tf-sentencepiece

Unsupervised text tokenizer for Neural Network-based text generation.

bert-multitask-learning

BERT for Multitask Learning

khmer-viterbi-segmenter

A zero-dependency, high-performance Khmer word segmenter using the Viterbi algorithm. Optimized for dictionary accuracy, ultra-low memory footprint, and edge deployment.

ekphrasis

Ekphrasis is a text processing tool, geared towards text from social networks, such as Twitter or Facebook. Ekphrasis performs tokenization, word normalization, word segmentation (for splitting hashtags) and spell correction, using word statistics from 2 big corpora (english Wikipedia, twitter - 330mil english tweets).

vncorenlp

A Python wrapper for VnCoreNLP using a bidirectional communication channel.

lac

百度NLP：分词，词性标注，命名实体识别，词重要性

kitoken

Fast tokenizer for language models, compatible with SentencePiece, Tokenizers, Tiktoken and more. Supports BPE, Unigram and WordPiece tokenization in JavaScript, Python and Rust.

cjieba

Python cffi binding to CppJieba

symspellcpppy

Fast SymSpell written in c++ and exposes to python via pybind11

hellonlp

NLP tools, word segmentation, sentence segmentation， New-Word-Discovery，新词发现

dksplit

DKSplit - fast word segmentation for Python. Split domain names and concatenated strings into words using BiLSTM-CRF + ONNX Runtime.

hashformers

Transformer-powered hashtag segmentation with beam search, RRF ensembles, and agent-ready MCP workflows. A scalable alternative to heuristic splitters and massive LLMs.