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Persian NLP Toolkit

Project description

Hazm - Persian NLP Toolkit

Tests PyPI - Downloads PyPI - Python Version GitHub


Module name
DependencyParser 85.6%
POSTagger 98.8%
Chunker 93.4%
Lemmatizer 89.9%
Metric Value
SpacyPOSTagger Precision 0.99250
Recall 0.99249
F1-Score 0.99249
EZ Detection in SpacyPOSTagger Precision 0.99301
Recall 0.99297
F1-Score 0.99298
SpacyChunker Accuracy 96.53%
F-Measure 95.00%
Recall 95.17%
Precision 94.83%
SpacyDependencyParser TOK Accuracy 99.06
UAS 92.30
LAS 89.15
SENT Precision 98.84
SENT Recall 99.38
SENT F-Measure 99.11


Hazm is a python library to perform natural language processing tasks on Persian text. It offers various features for analyzing, processing, and understanding Persian text. You can use Hazm to normalize text, tokenize sentences and words, lemmatize words, assign part-of-speech tags, identify dependency relations, create word and sentence embeddings, or read popular Persian corpora.


  • Normalization: Converts text to a standard form, such as removing diacritics, correcting spacing, etc.
  • Tokenization: Splits text into sentences and words.
  • Lemmatization: Reduces words to their base forms.
  • POS tagging: Assigns a part of speech to each word.
  • Dependency parsing: Identifies the syntactic relations between words.
  • Embedding: Creates vector representations of words and sentences.
  • Persian corpora reading: Easily read popular Persian corpora with ready-made scripts and minimal code.


To install the latest version of Hazm, run the following command in your terminal:

pip install hazm

Alternatively, you can install the latest update from GitHub (this version may be unstable and buggy):

pip install git+


Finally if you want to use our pretrained models, you can download it from the links below:

Module name Size
Download WordEmbedding ~ 5 GB
Download SentEmbedding ~ 1 GB
Download POSTagger ~ 18 MB
Download DependencyParser ~ 15 MB
Download Chunker ~ 4 MB
Download spacy_pos_tagger_parsbertpostagger ~ 630 MB
Download spacy_pos_tagger_parsbertpostagger95 ~ 630 MB
Download spacy_chunker_uncased_bert ~ 650 MB
Download spacy_chunker_parsbert ~ 630 MB
Download spacy_dependency_parser ~ 630 MB


>>> from hazm import *

>>> normalizer = Normalizer()
>>> normalizer.normalize('اصلاح نويسه ها و استفاده از نیم‌فاصله پردازش را آسان مي كند')
'اصلاح نویسه‌ها و استفاده از نیم‌فاصله پردازش را آسان می‌کند'

>>> sent_tokenize('ما هم برای وصل کردن آمدیم! ولی برای پردازش، جدا بهتر نیست؟')
['ما هم برای وصل کردن آمدیم!', 'ولی برای پردازش، جدا بهتر نیست؟']
>>> word_tokenize('ولی برای پردازش، جدا بهتر نیست؟')
['ولی', 'برای', 'پردازش', '،', 'جدا', 'بهتر', 'نیست', '؟']

>>> stemmer = Stemmer()
>>> stemmer.stem('کتاب‌ها')
>>> lemmatizer = Lemmatizer()
>>> lemmatizer.lemmatize('می‌روم')

>>> tagger = POSTagger(model='pos_tagger.model')
>>> tagger.tag(word_tokenize('ما بسیار کتاب می‌خوانیم'))
[('ما', 'PRO'), ('بسیار', 'ADV'), ('کتاب', 'N'), ('می‌خوانیم', 'V')]

>>> spacy_posTagger = SpacyPOSTagger(model_path = 'MODELPATH')
>>> spacy_posTagger.tag(tokens = ['من', 'به', 'مدرسه', 'ایران', 'رفته_بودم', '.'])
[('من', 'PRON'), ('به', 'ADP'), ('مدرسه', 'NOUN,EZ'), ('ایران', 'NOUN'), ('رفته_بودم', 'VERB'), ('.', 'PUNCT')]

>>> posTagger = POSTagger(model = 'pos_tagger.model', universal_tag = False)
>>> posTagger.tag(tokens = ['من', 'به', 'مدرسه', 'ایران', 'رفته_بودم', '.'])
[('من', 'PRON'), ('به', 'ADP'), ('مدرسه', 'NOUN'), ('ایران', 'NOUN'), ('رفته_بودم', 'VERB'), ('.', 'PUNCT')] 

>>> chunker = Chunker(model='chunker.model')
>>> tagged = tagger.tag(word_tokenize('کتاب خواندن را دوست داریم'))
>>> tree2brackets(chunker.parse(tagged))
'[کتاب خواندن NP] [را POSTP] [دوست داریم VP]'

>>> spacy_chunker = SpacyChunker(model_path = 'model_path')
>>> tree = spacy_chunker.parse(sentence = [('نامه', 'NOUN,EZ'), ('ایشان', 'PRON'), ('را', 'ADP'), ('دریافت', 'NOUN'), ('داشتم', 'VERB'), ('.', 'PUNCT')])
>>> print(tree)
  (NP نامه/NOUN,EZ ایشان/PRON)
  (POSTP را/ADP)
  (VP دریافت/NOUN داشتم/VERB)

>>> word_embedding = WordEmbedding(model_type = 'fasttext', model_path = 'word2vec.bin')
>>> word_embedding.doesnt_match(['سلام' ,'درود' ,'خداحافظ' ,'پنجره'])
>>> word_embedding.doesnt_match(['ساعت' ,'پلنگ' ,'شیر'])

>>> parser = DependencyParser(tagger=tagger, lemmatizer=lemmatizer)
>>> parser.parse(word_tokenize('زنگ‌ها برای که به صدا درمی‌آید؟'))
<DependencyGraph with 8 nodes>

>>> spacy_parser = SpacyDependencyParser(tagger=tagger, lemmatizer=lemmatizer)
>>> spacy_parser.parse_sents([word_tokenize('زنگ‌ها برای که به صدا درمی‌آید؟')])


Visit to view the full documentation.

Hazm in other languages

Disclaimer: These ports are not developed or maintained by Roshan. They may not have the same functionality or quality as the original Hazm..

  • JHazm: A Java port of Hazm
  • NHazm: A C# port of Hazm


We welcome and appreciate any contributions to this repo, such as bug reports, feature requests, code improvements, documentation updates, etc. Please follow the Contribution guideline when contributing. You can open an issue, fork the repo, write your code, create a pull request and wait for a review and feedback. Thank you for your interest and support in this repo!


Code contributores



  • Thanks to Virastyar project for providing the persian word list.

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