Map/Reduce (Disco) on millions of tweets

Whilst working on data sciencey problems for AdaptiveLab I’m becoming more involved in simple visualisations for proof-of-concepts for clients. This ties in nicely with my PyCon Parallel Computing tutorial with Minesh. I’ve been prototyping a Disco map/reduce tutorial (part 2 for PyCon) using tweets collected during the life of SocialTies during 2011-2012.

Using 11,645,331 tweets on 1 machine running through Disco with a modified word_count example it is easy to filter to keep tweets with a certain word (“loving” in this case) and to plot a word cloud (thanks Andreas!) of the remaining tweets:

Words in “loving” tweets

Tweet analysis often shows a self-referential nature – here we see “i’m” as one of the most popular words. It is nice to see “:)” making an appearance. Brands mentioned include “Google”, “iPhone”, “iPad”. We also see “thanks”, “love”, “nice” and “watching” along with “London” and “music”. Annoyingly I’m not cleaning the words so we see “it!”, “it.”, “(via” (with erroneous brackets) and the like which clutter the results a bit.

Next I’ve applied “hating” as the filter to the same set:

Words in “hating” tweets

One of the most mentioned words is “people” which is a bit of a shame, along with “i’m”. Thankfully we see some “love” and “loving” there. “apple” appears more frequently than “twitter” or “google”. Lots of related negative words also appear e.g. “stupid”, “hate”, “shit”, “fuck”, “bitch”.

Interestingly few of the terms shown include Twitter users or hashtags.

Finally I tried the same using “apple” on an earlier smaller set (859,157 tweets):

Words in “apple” tweets

Unsurprisingly we see “store”, “iphone”, “ipad”  “steve”. Hashtags include “#wwdc”, “#apple” and “#ipad”. The Twitter accounts shown are errors due to string-matching on “apple” except for @techcrunch.

I find it interesting to see competitor brands being mentioned in the same tweets (e.g. “google”, “microsoft”, “android”, “samsung”, “amazon”, “nokia”), although the firms are obviously related to “apple”.

An improvement would be to remove words from the chart that match the original pattern (hence removing words like “apple” and “#apple” but keeping everything else). Removing near-duplicate terms (e.g. “apple”, “apples”, “apple'”) and performing common string clean-ups (removing punctuation) which also help.

It would also be good to change the colour channels – perhaps using red for commonly-negative words and green for commonly-positive words, with the rest in a neutral colour. Maybe we could also colour the neutral words differently if they’re commonly associated with the key word (e.g. brands of the key word).

Getting started with Disco was easy enough. The installation takes a few hours (the Disco project instructions assume a certain familiarity with networked systems), after that editing the examples is straightforward. Visualising using Andreas’ code was very straight-forward. The source will be posted around the time of my PyCon tutorial in March.


Ian applies Data Science as an AI/Data Scientist for companies in ModelInsight and in his Mor Consulting, sign-up for Data Science tutorials in London. He also founded the image and text annotation API Annotate.io, lives in London and is a consumer of fine coffees.

4 Comments

  • Brendan Scott
    Interesting post. At the risk of teaching you to suck eggs, you'd lemmatize to group/distinguish near duplicates.
  • Ag, Brendan I think I sent you a personal reply rather than a public comment! I'd said (probably in email) that doing some more text cleaning (removal of trailing punctuation, bracket removal) and maybe removing plurals/possessive forms should do a good job for the visualisation. I'll definitely consider lemmatization for a future go at this (but I wonder if much else will be revealed...but of course the only way to know is to try)
  • Brendan Scott
    Another thing you could do is map them against time (if you've got timestamp data for the tweets?). Apple in 2005 would presumably be pretty different to today.
  • Sadly no timestamps in my set from socialties. Here at work I have full metadata on another set so will be trying volumes-over-time (I'm looking at brands [via Named Entity Recognition] over time co-incident with advertisement brands).