aliksarkar/bengali-pos-tagging-using-bnlp

Machine Learning approach to Bengali Parts of Speech Tagging using BNLP.

Machine Learning approach to Bengali Parts of Speech Tagging using BNLP.

About the Project:

This project has been done as the part of Minor Project submission at Heritage Institute of Technology under the Mentorship of Prof. Sandipan Ganguly (HIT-K).

Introduction to BNLP (Bengali Natural Language Processing) Toolkit:

A library with pre-trained model for POS Tagging, Word Embedding, Name Entity Recognition, FastText, Bengali StopWords, Bengali Corpus Class recognition etc.

Installation

• pypi package installer(python 3.6, 3.7, 3.8 tested okay)

  pip install bnlp_toolkit

  or Upgrade

  pip install -U bnlp_toolkit

Methodology:

Raw Text-> Tokenization -> POS Tagging

• We have first used Natural Language ToolKit or NLTK library to define & apply basic POS tagging on English Corpus.

• In the next step, we took a small Bengali Corpus & tokenized each Bengali words from sentences individually using BasicTokenizer from BNLP under Rule-Based Approach. Then the same applied on two larger Bengali corpora.

• In next step, we have used NLTKTokenizer from BNLP to tokenize Bengali small corpus into two phases. One is in Word Tokenizing & second one is in Sentence Tokenizing under Rule-based approach. Word Tokenizer tokenized Bengali Words while Sentence Tokenizer tokenized each sentences separately. Then applied the same on two larger Bengali Corpora.

• Next we used SentencePieceTokenizer to apply Unsupervised Learning on two Bengali Corpora.

• In the next step, we used POS function with pre-trained model from BNLP & took a small Bengali Corpus to tag Bengali words & categorize them into different Parts of Speeches under Conditional Random Field based approach.

• In the next we have embedded Bengali Words of a corpus using BengaliWord2Vector with pre-trained model from BNLP to get the vector shape of words & their values under Deep Learning approach.

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Confusion Matrix

We found false positive result as well & calculated Confusion Matrices to get Precision, Recall & F1 value.

We have used dataset from NLTR & got 90% accuracy.

Tools:

1. Jupyter Notebook/Google Colab
2. BNLP Library taken from: Prof. Sagor Sarker (Bangladesh) on GitHub.
3. Research papers on Bengali Pos Tagging.

Mentor: Prof. Sandipan Ganguly (HIT-K).

Developers:

1. Alik Sarkar
2. Arghyadeep Banerjee
3. Soham Chakraborty
4. Tanmay Guchhait
5. Debabrata Maity
6. Rajdeep Das
7. Sanju Manna

Read on ResearchGate:

https://www.researchgate.net/publication/359257508_Machine_Learning_approach_to_POS_Tagging_in_Bengali_Language_Project_Report

References taken from:

1. https://bnlp.readthedocs.io/en/latest/
2. https://github.com/sagorbrur/bnlp
3. https://www.researchgate.net/publication/348957805_BNLP_Natural_language_processing_toolkit_for_Bengali_language
4. https://medium.com/analytics-vidhya/bengali-pos-part-of-speech-tagging-using-indian-corpus-e85f47d3ad65
5. https://nltr.itewb.gov.in/

BNLP Developer Credit: Prof. Sagor Sarker (https://github.com/sagorbrur)