Difference between revisions of "Winter Milestone 5 @niranga"

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(Brief introduction of the system)
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map (Figure 2) on the Twitch homepage. Users can filter
map (Figure 2) on the Twitch homepage. Users can filter
the data based on activity type or time of day.
the data based on activity type or time of day.
=== Module 2: Photo Ranking ===
==== Problem/Limitations ====
Beyond harnessing local observations via Census, we
wanted to demonstrate that twitch crowdsourcing could
support traditional crowdsourcing tasks such as image ranking (e.g., Matchin [17]). Needfinding interviews and
prototyping sessions with ten product design students at
Stanford University indicated that product designers not
only need photographs for their design mockups, but they
also enjoy looking at the photographs. Twitch harnesses
this interest to help rank photos and encourage contribution
of new photos.
==== Module details ====
Photo Ranking crowdsources a ranking of stock photos for
themes from a Creative Commons-licensed image library.
The Twitch task displays two images related to a theme
(e.g., Nature Panorama) per unlock and asks the user to
slide to select the one they prefer (Figure 1). Pairwise
ranking is considered faster and more accurate than rating
[17]. The application regularly updates with new photos.
Users can optionally contribute new photos to the database
by taking a photo instead of rating one. Contributed photos
must be relevant to the day’s photo theme, such as Nature
Panorama, Soccer, or Beautiful Trash. Contributing a photo
takes longer than the average Twitch task, but provides an
opportunity for motivated individuals to enter the
competition and get their photos rated.
Like with Census, users receive instant feedback through a
popup message to display how many other users agreed
with their selection. We envision a web interface where all
uploaded images can be browsed, downloaded and ranked.
This data can also connect to computer vision research by
providing high-quality images of object categories and
scenes to create better classifiers.
=== Module 3: Structuring the Web ===
==== Problem/Limitations ====
Search engines no longer only return documents — they
now aim to return direct answers [6,9]. However, despite
massive undertakings such as the Google Knowledge Graph
[36], Bing Satori [37] and Freebase [7], much of the
knowledge on the web remains unstructured and unavailable for interactive applications. For example,
searching for ‘Weird Al Yankovic born’ in a search engine
such as Google returns a direct result ‘1959’ drawn from
the knowledge base; however, searching for the equally
relevant ‘Weird Al Yankovic first song’, ‘Weird Al
Yankovic band members’, or ‘Weird Al Yankovic
bestselling album’ returns a long string of documents but no
direct answer, even though the answers are readily available
on the performer’s Wikipedia page.
==== Module preview ====
To enable direct answers, we need structured data that is
computer-readable. While crowdsourced undertakings such
as Freebase and dbPedia have captured much structured
data, they tend to only acquire high-level information and
do not have enough contributors to achieve significant
depth on any single entity. Likewise, while information
extraction systems such as ReVerb [14] automatically draw
such information from the text of the Wikipedia page, their
error rates are currently too high to trust. Crowdsourcing
can help such systems identify errors to improve future
accuracy [18]. Therefore, we apply twitch crowdsourcing to
produce both structured data for interactive applications and
training data for information extraction systems.
==== Module details ====
Contributors to online efforts are drawn to goals that allow
them to exhibit their unique expertise [2]. Thus, we allow
users to help create structured data for topics of interest.
The user can specify any topic on Wikipedia that they are
interested in or want to learn about, for example HCI, the
Godfather films, or their local city. To do so within a oneto-two
second time limit, we draw on mixed-initiative
information extraction systems (e.g., [18]) and ask users to
help vet automatic extractions.
When a user unlocks his or her phone, Structuring the Web
displays a high-confidence extraction generated using
ReVerb, and its source statement from the selected
Wikipedia page (Figure 1). The user indicates with one
swipe whether the extraction is correct with respect to the
statement. ReVerb produces an extraction in SubjectRelationship-Object
format: for example, if the source
statement is “Stanford University was founded in 1885 by
Leland Stanford as a memorial to their son”, ReVerb
returns {Stanford University}, {was founded in}, {1885}
and Twitch displays this structure. To minimize cognitive
load and time requirements, the application filters only
include short source sentences and uses color coding to
match extractions with the source text.
In Structuring the Web, the instant feedback upon accepting
an extraction shows the user their progress growing a
knowledge tree of verified facts (Figure 5). Rejecting an
extraction instead scrolls the user down the article as far as
their most recent extraction source, demonstrating the
user’s progress in processing the article. In the future, we
envision that search engines can utilize this data to answer a
wider range of factual queries.

Revision as of 13:03, 13 February 2016


Introducing the workers skill to the Boomerang Ranking

Brief introduction of the system

Boomerang, the rating system that uses in Daemo decide what are tasks that workers going to get in their future and what type of workers, requesters going to get for their task. Requesters' ratings of workers of tasks are used to give early access to workers that requester rates highly. However, Boomerang still can recommend a worker to the requester who are not familiar with the posted task because Boomerang doesn't consider the workers skill level related to that particular task when recommend.

For example:-

  • Requester post two tasks to the platform (Image tagging, Translation)
  • When the requester posts the tasks Boomerang recommend the higher rating workers first
  • However, among those workers, there can be workers who are not familiar with those tasks because those workers previously have worked with the requester on some other type of tasks( Surveys, Bookkeeping, etc.)
  • So, if the requester selects one of the higher rating worker not familiar with the task, there can be a quality issue.

How is the system solving critical problems

To motivate continued participation, Twitch provides both instant and aggregated feedback to the user. An instant feedback display shows how many other users agreed via a fadeout as the lock screen disappears (Figure 4) or how the user’s contributions apply to the whole (Figure 5). Aggregated data is also available via a web application, allowing the user to explore all data that the system has collected. For example, Figure 2 shows a human generated map from the Census application. To address security concerns, users are allowed to either disable or keep their existing Android passcode while using Twitch. If users do not wish to answer a question, they may skip Twitch by selecting ‘Exit’ via the options menu. This design decision has been made to encourage the user to give Twitch an answer, which is usually faster than exiting. Future designs could make it easier to skip a task, for example through a swipe-up.

Introducing modules of the system

Below, we introduce the three main crowdsourcing applications that Twitch supports. The first, Census, attempts to capture local knowledge. The following two, Image Voting and Structuring the Web, draw on creative and topical expertise. These three applications are bundled into one Android package, and each can be accessed interchangeably through Twitch's settings menu.

Module 1: Census


Despite progress in producing effective understanding of static elements of our physical world — routes, businesses and points of interest — we lack an understanding of human activity. How busy is the corner cafe at 2pm on Fridays? What time of day do businesspeople clear out of the downtown district and get replaced by socializers? Which neighborhoods keep high-energy activities going until 11pm, and which ones become sleepy by 6pm? Users could take advantage of this information to plan their commutes, their social lives and their work.

Module preview

Existing crowdsourced techniques such as Foursquare are too sparse to answer these kinds of questions: the answers require at-the-moment, distributed human knowledge. We envision that twitch crowdsourcing can help create a human-centered equivalent of Google Street View, where a user could browse typical crowd activity in an area. To do so, we ask users to answer one of several questions about the world around them each time they unlock their phone. Users can then browse the map they are helping create.

System details

Census is the default crowdsourcing task in Twitch. It collects structured information about what people experience around them. Each Census unlock screen consists of four to six tiles (Figures 1 and 3), each task centered around questions such as: • How many people are around you? • What kinds of attire are nearby people wearing? • What are you currently doing? • How much energy do you have right now? While not exhaustive, these questions cover several types of information that a local census might seek to provide. Two of the four questions ask users about the people around them, while the other two ask about users themselves; both of which they are uniquely equipped to answer. Each answer is represented graphically; for example, in case of activities, users have icons for working, at home, eating, travelling, socializing, or exercising. To motivate continued engagement, Census provides two modes of feedback. Instant feedback (Figure 4) is a brief Android popup message that appears immediately after the user makes a selection. It reports the percentage of responses in the current time bin and location that agreed with the user, then fades out within two seconds. It is transparent to user input, so the user can begin interacting with the phone even while it is visible. Aggregated report allows Twitch users to see the cumulative effect of all users’ behavior. The data is bucketed and visualized on a map (Figure 2) on the Twitch homepage. Users can filter the data based on activity type or time of day.