Text Summerizer

Text Mining on CBC news article with Natural Language Processing(NLP) - Automatically summarize the given text using spaCy & Python.

Requirements

1. Spacy
2. spaCy Model
   • python -m spacy download en_core_web_sm

Overview

1. Convert the input text to a list of sentences. Then, compute the number of sentences in the given Text.
2. Calculate the frequency of words in each sentence:
   • The output is a dictionary where each key is a sentence and the value is also a dictionary of word frequency.
3. Calculate Term frequency for each word in a sentence:

TF(word) = (Number of times term “word” appears in a sentence) / (Total number of terms in the sentence)

4. Create a matrix termFrequency:
   • The termFrequency matrix is a dictionary where each key is a sentence and the value is also a dictionary of word frequency.
5. For each word compute how many sentences contain that word.
6. Calculate IDF for each word in a sentence.

IDF(word) = log_e(Total number of sentences / number of sentences with term word in it)

7. Compute the TF-IDF for each word in each sentence.
8. Use the TF-IDF computed in (7) and give a weight for each sentence.
9. Threshold: compute the average sentence weight
10. Generate the summary : select a sentence for summarization if the weight of the sentence exceeds the threshold.

References

• COVID-19 Article - CBC news
• spaCy