🔑 Keyword spaCy

Keyword spaCy is a spaCy pipeline component for extracting keywords from text using cosine similarity. The basis for this comes from KeyBERT: A Minimal Method for Keyphrase Extraction using BERT, a transformer-based approach to keyword extraction. The methods employed by Keyword spaCy follow this methodology closely. It allows users to specify the range of n-grams to consider and can operate in a strict mode, which limits results to the specified n-gram range.

Installation

Before using Keyword spaCy, make sure you have spaCy installed:

pip install keyword-spacy

Then, download the en_core_web_md model:

python -m spacy download en_core_web_md

Usage

To use the Keyword Extractor, first, create a spaCy nlp object:

import spacy
nlp = spacy.load("en_core_web_md")

Then, add the KeywordExtractor to the pipeline:

nlp.add_pipe("keyword_extractor", last=True, config={"top_n": 10, "min_ngram": 3, "max_ngram": 3, "strict": True})

Now you can process text and extract keywords:

text = "Natural language processing is a fascinating domain of artificial intelligence. It allows computers to understand and generate human language."
doc = nlp(text)
print("Top Keywords:", doc._.keywords)

Output:

Top Keywords: ['generate human language', 'Natural language processing']

Each token that is not a punctuation also receives a special attribute ._.keyword_value, this is the value of a given word's similarity to the doc.vector. This may be helpful for other downstream tasks.

Configuration

The KeywordExtractor can be configured using the following parameters:

• top_n: The number of top keywords to extract.
• min_ngram: The minimum size for n-grams.
• max_ngram: The maximum size for n-grams.
• strict: If set to True, only n-grams within the min_ngram to max_ngram range are considered. If False, individual tokens and the specified range of n-grams are considered.

Methodology

The methodology employed by Keyword spaCy is inspired by KeyBERT. It utilizes cosine similarity between tokens (and n-grams) and the entire document to determine the relevance of terms. The most similar terms are then considered as keywords.

References

• KeyBERT: A Minimal Method for Keyphrase Extraction using BERT