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Data Collection Duen Horng (Polo) Chau Associate Professor, College - PowerPoint PPT Presentation

Mar 14, 2023 •955 likes •1.1k views

http://poloclub.gatech.edu/cse6242 CSE6242/CX4242: Data & Visual Analytics Data Collection Duen Horng (Polo) Chau Associate Professor, College of Computing Associate Director, MS Analytics Machine Learning Area Leader,

  1. http://poloclub.gatech.edu/cse6242 
 CSE6242/CX4242: Data & Visual Analytics 
 Data Collection Duen Horng (Polo) Chau 
 Associate Professor, College of Computing 
 Associate Director, MS Analytics 
 Machine Learning Area Leader, College of Computing 
 Georgia Tech Partly based on materials by 
 Professors Guy Lebanon, Jeffrey Heer, John Stasko, Christos Faloutsos

  2. How to Collect Data? Method Effort Download Low API Medium (Application program interface) Scrape/Crawl High 2

  3. How to Collect Data? Method Effort Download Low API Medium (Application program interface) Scrape/Crawl High 2

  4. Data you can just download NYC Taxi data: Trip (11GB), Fare (7.7GB) StackOverflow (xml) Wikipedia (data dump) Atlanta crime data (csv) Soccer statistics Data.gov … 3

  5. Data you can just download If you have leads, let us know on Piazza! More datasets on course website: 4

  6. Collect Data via APIs Google Data API (e.g., Google Maps Directions API) 
 https://developers.google.com/gdata/docs/directory Twitter (small subset) 
 https://dev.twitter.com/streaming/overview Last.fm (Pandora has unofficial API) Flickr data.nasa.gov data.gov Facebook (your friends only) 5

  7. Data that needs scraping Amazon (reviews, product info) ESPN eBay Google Play Google Scholar … 6

  8. How to Scrape? 
 Google Play example 
 Goal: collect the network of similar apps 7

  9. 8

  10. How to Scrape? 
 Goal: Write a program/algorithm to scrape Google Play to collect a million-node network of similar apps Each node is an app An edge connects two similar apps Hint: start with some apps (e.g., Shazam), and go from there. 9

  11. How to Scrape? 
 Google Play example 
 Goal: collect the network of similar apps https://play.google.com/store/apps/details?id= com.shazam.android https://play.google.com/store/apps/details? id= com.spotify.music 10

  12. Popular Scraping Libraries Selenium . Supports multiple languages. http://www.seleniumhq.org 
 Beautiful Soup . Python. https://www.crummy.com/software/BeautifulSoup 
 Scrapy . Python. https://scrapy.org 
 JSoup . Java. https://jsoup.org Important considerations: Different web content shows up depending on web browsers used 
 Scraper may need different “web driver” (e.g., in Selenium), or browser “user agent” Data may show up after certain user interaction (e.g., click a button) • Scraper may need to simulate the actions. • Selenium supports more actions than beautiful soup: 
 http://www.discoversdk.com/blog/web-scraping-with-selenium 
 11

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