Add Negative Labels [PSCDD]

[dieko95]

Important: I will pause this issue and advance on #75 . Fetching negative-labelled articles might take at least 1 week.

Problem

The NGO's tagged data only contains positive labels (e.g., this tweet IS a public service report). At this point, we haven't included negative labels (e.g., this tweet is NOT a public service report).

Proposed Solution

Add negative labels from the 2020 tagged data.

Tasks

• Use the data annotated last year in C4V for Negative Labels (and positive if quick)

  • Compare last year's annotated data schema with positive label dataset to assess if it's possible to include it.
  • If possible, add the negative labels to the development dataset.
    The labels are not compatible with Add Positive labels [PSCDD] #56 , at this point in time it would take more effort to unify the schemas rather than web scraping from scratch.

• If it's not possible to use last year's negative labels
  - [ ] Webscrape el pitazo articles where the URLs are not within Add Positive labels [PSCDD] - elpitazo #48 dataset.
  - This will give us articles that are not public services problems.
  - [ ] Concatenate these articles with Add Positive labels [PSCDD] - elpitazo #48 dataset.

Negative labels web scraping strategy

1. Loop over elpitazo.net/category/<LOCATION>/page/<N> to get all the links from PSCDD positive labels dataset.
2. Select the links that aren't in PSCDD positive labels dataset.
3. Webscrape this links with PSCDD elpitazo web scraper.

• Create elpitazo page discovery web scraper
  • Extract links
  • Extract news articles' date. This will take a bit more time than I thought.
• Fetch el pitazo links for occidente and store it within a list.
• Find links that don't match with PSCDD positive labels links.
• Web scrape non-matched positive label links.

Notes

• The dates from the Add Positive labels [PSCDD] #56 range from 2019-05-02 to 2020-06-10

count                    2401
unique                    397
top       2020-06-10 00:00:00
freq                       27
first     2019-05-02 00:00:00
last      2020-10-30 00:00:00

News articles per location

	count
occidente	519
gran-caracas	403
oriente	396
los-andes	287
los-llanos	284
centro	196
guayana	93
pitazo-en-la-calle	88
regiones	64
economia	21
infociudadanos	16
tecnologia	10
vista_2	8
reportajes	4
radio	3
alianzas	2
sucesos	2
salud	2
sin-categoria	1
fotogalerias	1
cronicas	1

[dieko95]

I will pause this issue and advance on #75 . Fetching negative-labelled articles might take at least 1 week.

cc @Edilmo