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Label news snippets with Snorkel

The main goal of this notebook is to demonstrate the use of semi supervised data labelling technique to label news about cleantech in accordance with UN Sustainable Goal 13 - Climate Action and 7 - Affordable and Clean Energy.

Dataset:

Techcrunch news article snapshot of 2011-2021 with 32,000 news. All copyright belongs to TechCrunch.

For validation data, 3,000 news were labelled manually with 2 categories: CLEANTECH and NOTRELEVANT

Columns:

  • date_gmt(datetime) - published date
  • link(string) - source article link
  • clean_text (string) - news article summary, concatenated with header
  • categories (string) - article categories ids
  • tags (string) - tag ids assigned to the article
  • author(digit) - the reporter id who is the author of the news article
  • _embedded(string) - string with dictionaries that contain some descriptive info on authors, categories and tags

Main ideas:

  1. All news tags and categories were analyzed with calc_count_stats.py script, and were divided into cleantech/notrelevant.
  2. Data were enriched with unsupervised topics model using Gensim with gensim_model.pyscript. Topics were then used as one of the inputs in snorkel functions.
  3. Snorkel functions focused on: keywords matching, cleantech/not cleantech abbrevations, news categories, news tags, cleantech funds mentioned, mentions of cleantech/not cleantech startups, authors that write on topics not in cleantech.

Functions performance:

function name j Polarity Coverage Overlaps Conflicts Correct Incorrect Emp. Acc.
lf_cleantech_keywords 0 [0] 0.021927 0.018605 0.010299 32 34 0.484848
lf_notcleantech_keywords 1 [1] 0.001661 0.001661 0.000000 5 0 1.000000
lf_contains_cleantech_abbrv 2 [0] 0.019269 0.014618 0.007641 36 22 0.620690
lf_contains_notcleantech_abbrv 3 [1] 0.023256 0.021595 0.000997 69 1 0.985714
lf_cleantech_startups 4 [] 0.000000 0.000000 0.000000 0 0 0.000000
lf_notcleantech_startups 5 [1] 0.011296 0.007973 0.001329 33 1 0.970588
lf_cleantech_funds 6 [] 0.000000 0.000000 0.000000 0 0 0.000000
lf_contains_notcleantech_categories 7 [1] 0.273422 0.246512 0.008970 821 2 0.997570
lf_contains_cleantech_categories 8 [0] 0.025249 0.019269 0.008306 62 14 0.815789
lf_contains_cleantech_tags 9 [0] 0.074751 0.052824 0.031561 127 98 0.564444
lf_contains_notcleantech_tags 10 [1] 0.638538 0.379734 0.035880 1877 45 0.976587
lf_notcleantech_authors 11 [1] 0.052824 0.046844 0.001661 155 4 0.974843
lf_notcleantech_topics 12 [1] 0.224252 0.187375 0.009635 664 11 0.983704

Model results:

LabelModel

produces a set of noise-aware probibalistic training labels

Measure Value
accuracy 0.949
recall 0.95
precision 0.99

MajorityLabelVoter model

takes the most popular label from functions on per datapoint basis

Measure Value
accuracy 0.964
recall 0.966
precision 0.99

Run the notebook:

To run the notebook execute poetry install and then poetry run jupyter lab.

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Semi-supervised labelling of news snippets to extract cleantech news

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