cjhutto/vaderSentiment

Incorrect results for sentences containing negations

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#71 创建于 2019年1月13日

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 (1 评论) (0 反应) (0 负责人)Python (4,146 star) (975 fork)batch import
help wanted

描述

Hi

First of all, great work!

I've noticed some negations are analysed incorrectly. For instance,

Not the worst show I've seen-------- {'neg': 0.0, 'neu': 0.603, 'pos': 0.397, 'compound': 0.5096} Not the worst ever but definitely worst this year------ {'neg': 0.0, 'neu': 0.372, 'pos': 0.628, 'compound': 0.879}

The compound scores are incorrectly positive as these two sentences are neural at best.

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技术栈
python
领域
machine learning
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
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前置要求
Python programmingSentiment analysis basics
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
65
研究方向
Investigate the vaderSentiment library's handling of negation in the lexicon and score computation. Look at the source code (e.g., vaderSentiment.py) to understand how negations like 'not' are processed. Modify the rule for negations to correctly flip the sentiment polarity for phrases like 'not the worst'. Test with given examples and ensure compound score is negative.