Kleine letters (lowercasing)

Je analyseert gebruikersreviews voor een reiswebsite. Deze reviews bevatten vaak inconsistente hoofdlettergebruik zoals "TRAVEL" en "travel". Om de tekst voor te bereiden op sentimentanalyse en topic-extractie, zet je eerst alle woorden om naar kleine letters, daarna tokeniseer je ze en verwijder je stopwoorden en leestekens.

De functie word_tokenize() en een lijst stop_words zijn al beschikbaar. NLTK-resources zijn al gedownload.

Deze oefening maakt deel uit van de cursus

Natural Language Processing (NLP) in Python

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Oefeninstructies

Zet de gegeven review om naar kleine letters.
Tokeniseer de lower_text in woorden.
Gebruik een list comprehension om stopwoorden en leestekens te verwijderen met de lijsten stop_words en string.punctuation.

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Probeer deze oefening eens door deze voorbeeldcode in te vullen.

review = "I have been FLYING a lot lately and the Flights just keep getting DELAYED. Honestly, traveling for WORK gets exhausting with endless delays, but every trip teaches you something new!"

# Lowercase the review
lower_text = ____

# Tokenize the lower_text into words
tokens = ____

# Remove stop words and punctuation
clean_tokens = [____ if word ____ and word ____]

print(clean_tokens)

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Deze oefening maakt deel uit van de cursus

Natural Language Processing (NLP) in Python

SkillTag.level.intermediateSkillTag.label

4.8+

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Learn the essentials of text processing in Natural Language Processing (NLP). Master techniques such as tokenization, stop word and punctuation removal, and text normalization with lowercasing, stemming, and lemmatization to prepare text data for further analysis and insight extraction.

Exercise 1: Introductie tot natural language processing Exercise 2: Zin- en woordtokenization Exercise 3: NLP-werkstroom Exercise 4: Stopwoorden en interpunctie verwerken Exercise 5: Stopwoorden verwijderen Exercise 6: Interpunctie verwijderen Exercise 7: Technieken voor het normaliseren van tekst Exercise 8: Kleine letters (lowercasing)

Huidige oefening

Exercise 9: Stemming Exercise 10: Lemmatization

Transform raw text into powerful numerical features. Create Bag-of-Words and TF-IDF representations to capture word importance across documents, then explore word embeddings like Word2Vec and GloVe to uncover deep semantic patterns. Visualize frequency, relevance, and similarity to bring your text data to life.

Exercise 1: Bag-of-Words representation Exercise 2: Building vocabulary from customer reviews Exercise 3: Transforming text to numbers with BoW Exercise 4: Frequency analysis of product reviews Exercise 5: Visualizing word frequencies Exercise 6: TF-IDF vectorization Exercise 7: TF-IDF representation of product feedback Exercise 8: Comparing BoW and TF-IDF representations Exercise 9: Embeddings Exercise 10: Exploring word relationships with embeddings Exercise 11: Visualizing and comparing word embeddings

Harness the power of pre-trained models to perform advanced text classification tasks. Use Hugging Face pipelines for sentiment analysis, topic classification, and natural language inference. Evaluate semantic similarity and grammatical correctness with state-of-the-art models, all without building anything from scratch.

Exercise 1: Hugging Face pipelines for sentiment analysis Exercise 2: Analyzing the sentiment of a review Exercise 3: Batch classifying multiple reviews Exercise 4: Comparing models on labeled review data Exercise 5: Zero-shot classification and QNLI Exercise 6: Zero-shot classification of support tickets Exercise 7: Does the text answer the question?Exercise 8: Question similarity and grammatical correctness Exercise 9: Detecting duplicate questions Exercise 10: Checking grammatical correctness

Dive into the core of modern NLP applications with token classification and text generation techniques. Learn to extract meaningful entities and grammatical structures using NER and PoS tagging. Master both extractive and abstractive question answering, and explore advanced generation tasks including summarization, translation, and language modeling using Hugging Face pipelines.

Exercise 1: Token classification Exercise 2: Identifying named entities in news headlines Exercise 3: Part of Speech tagging for text analysis Exercise 4: Question answering Exercise 5: Answering questions from product descriptions Exercise 6: Generating natural answers with abstractive QA Exercise 7: Sequence generation tasks Exercise 8: Summarizing news articles for quick insights Exercise 9: Translating customer reviews to French Exercise 10: Building a search completion system Exercise 11: Congratulations