Newsletter topic extraction

tfidf.py

"""
Usage: python tfidf.py extract_keywords

Reads from storage/keywords/corpus.csv, which has columns `<ID>,<Title>,<Description>`. Writes
keywords to storage/keywords/output.csv

I use this for newsletter topic modeling at https://thesample.ai/.
"""
import sys
import nltk
import re
import csv
import random
import numpy as np
import json
import shutil
from sklearn.feature_extraction.text import TfidfVectorizer
import pandas as pd
import fasttext

exclusions = [
        'subscribe',
        'newsletter',
        'weekly',
        'things',
        'daily',
        'day',
        'ideas',
        'week',
        'inbox',
        'delivered',
        'interesting',
        'better',
        'best',
        'thoughts',
        'latest',
        'new',
        'analysis',
        'good',
        'people'
        'free',
        'like',
        'notes'
        ]

def extract_keywords():
    try:
        nltk.corpus.stopwords.words('english')
    except:
        nltk.download('stopwords')

    with open('storage/keywords/corpus.csv', newline='') as csvfile:
        nls = [{'id': row[0], 'text': row[1] + ' ' + row[2]} for row in csv.reader(csvfile)]
    random.shuffle(nls)

    tfidf_vectorizer = TfidfVectorizer(
        use_idf=True,
        max_df=0.8,
        min_df=3/len(nls),
        stop_words='english'
    )

    texts = [nl['text'] for nl in nls]
    matrix = tfidf_vectorizer.fit_transform(texts)

    with open('storage/keywords/output.csv.tmp', 'w') as csvfile:
        writer = csv.writer(csvfile)
        for nl, v in list(zip(nls, matrix)):
            #print(nl['text'])
            x = list(zip(v.data, v.indices))
            x.sort(key=lambda pair: -pair[0])
            feature_names = tfidf_vectorizer.get_feature_names()
            keywords = [feature_names[i]
                        for value, i in x
                        if feature_names[i] not in exclusions]
            #print(', '.join(keywords[:5]))
            #print()
            writer.writerow([nl['id']] + keywords[:5])
    shutil.copyfile('storage/keywords/output.csv.tmp', 'storage/keywords/output.csv')

def main():
    eval(sys.argv[1])(*sys.argv[2:])

if __name__ == "__main__":
    main()

Also note that I'm using only newsletter title and description, not any of the newsletters' posts' contents. I got better keywords that way.

Oh nice, I'm trying to do it on the content of fairly large articles (5k+ words). I'll experiment with titles too I guess, but I don't think they'd be super accurate. I tested out: https://github.com/MaartenGr/KeyBERT which worked fairly well. Trying to get it to work with the clj to python interop now.

You can use this with article text too and see if it works. Omitting article text just happened to work better for my situation.

For calling from clj, I just shell out: (clojure.java.shell/sh "python3" (.getPath (clojure.java.io/resource "python/tfidf.py")) "extract_keywords")

Nice, I'll give it a try if what I got now doesn't work very well.