Add pythainlp.tag.chunk

[wannaphong]

What does this changes

I add pythainlp.tag.chunk. pythainlp.tag.chunk is a chunk parser.

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• Passed code styles and structures
• Passed code linting checks and unit test

[pep8speaks]

Hello @wannaphong! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-01-26 05:52:10 UTC

[wannaphong]

Google colab for test: https://colab.research.google.com/drive/11oF1Lqkcecxottb-M3BanT-qFQXmJIKT?usp=sharing

[wannaphong]

Model Card

Model Details

• Developer: Wannaphong Phatthiyaphaibun
• Model date: 2021-01-21
• Model version: 0.2
• Used in PyThaiNLP version: __
• GitHub: ___
• License: CC0
• train notebook: Add chunk notebook pythainlp_notebook#1
• Dataset: ORCHID++ from Thai Treebanks Dataset. We extract sentence subtree from tree to train data. (5,000 tree up to 5,935 tree)

Intended Use

• Parser thai sentence to phrase structure
• Not suitable for other language or other domain of orchid corpus.

Factors

• Based on thai chunk parser problems.

Metrics

• Evaluation metrics include precision, recall and f1-score.

Training Data

ORCHID++ (90%) from Thai Treebanks Dataset

Evaluation Data

ORCHID++ (10%) from Thai Treebanks Dataset

Quantitative Analyses

              precision    recall  f1-score   support

        B-NP       0.95      0.98      0.96       518
        I-NP       0.86      0.91      0.88      2128
           O       0.87      0.91      0.89       280
        B-PP       0.91      0.77      0.83        65
        I-PP       0.66      0.52      0.59       252
         B-S       0.65      0.49      0.56        90
         I-S       0.67      0.49      0.56      1082
        B-VP       0.86      0.89      0.88       515
        I-VP       0.90      0.94      0.92      4565

   micro avg       0.86      0.86      0.86      9495
   macro avg       0.81      0.77      0.79      9495
weighted avg       0.86      0.86      0.86      9495
 samples avg       0.86      0.86      0.86      9495

Ethical Considerations

no ideas

Caveats and Recommendations

• 1 Thai sentence with [(word,part-of-speech)] (part-of-speech model trained from orchid corpus)