Скачать или смотреть Using NLTK for Basic Sentiment Analysis

@genaiexp NLTK, or Natural Language Toolkit, is a key library when it comes to processing textual data in Python. It offers a suite of text processing libraries for classification, tokenization, stemming, tagging, parsing, and more. To start with sentiment analysis using NLTK, we need to understand some basic concepts. Tokenization is the process of breaking down text into individual words or sentences, which can then be analyzed. NLTK provides a simple way to tokenize text using its 'word_tokenize' function. Another important concept is stop words, which are common words that don't contribute much meaning to the text (like 'is', 'and', 'the'). NLTK has a built-in list of stop words that we can use to filter out these words from our analysis. For sentiment analysis, NLTK provides a 'SentimentIntensityAnalyzer' through its 'vader_lexicon'. This tool is specifically attuned to sentiments expressed in social media. A practical example would involve inputting a sample text and using the SentimentIntensityAnalyzer to get the polarity scores, which range from -1 (most negative) to 1 (most positive), and the subjectivity score, which indicates the level of personal opinion present in the text.