[Elsnet-list] Call for Participation: Aspect Based Sentiment Analysis - SemEval 2015 Task 12

Ion Androutsopoulos ion at aueb.gr
Thu Nov 6 14:32:32 CET 2014


Call For Participation
SemEval 2015 Task 12 - Aspect Based Sentiment Analysis
http://alt.qcri.org/semeval2015/task12/

TASK DESCRIPTION
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This task (ABSA15 for short) is a continuation of SemEval 2014 Task 4 
(ABSA14, http://alt.qcri.org/semeval2014/task4/). ABSA15 will focus 
primarily on the same domains as ABSA14 (restaurants and laptops). 
However, unlike ABSA14, the input datasets of ABSA15 will contain entire 
reviews, not isolated (potentially out of context) sentences. Also, 
ABSA15 consolidates the four subtasks of ABSA14 within a unified 
framework. Furthermore, ABSA15 will include an out-of-domain subtask, 
involving test data from a domain unknown to the participants, other 
than the domains that will be considered during training. ABSA15 
consists of the following subtasks.

Subtask 1: In-domain ABSA
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Given a review text about a laptop or a restaurant, identify the 
following information:

     Slot 1: Aspect Category. Identify every entity (E) and attribute 
(A) pair (E#A) towards which an opinion is expressed in the given text. 
E and A should be chosen from predefined domain-specific inventories of 
entity types (e.g. laptop, keyboard, operating system, restaurant, food, 
drinks) and attribute labels (e.g. performance, design, price, quality). 
Each E#A pair is considered an aspect category of the given text. The 
inventories of entity types and attribute labels are described in the 
annotation guidelines; see 
http://alt.qcri.org/semeval2015/task12/index.php?id=data-and-tools. Some 
examples highlighting the required information follow:

         a.    It is extremely portable and easily connects to WIFI at 
the library and elsewhere.  →{LAPTOP#PORTABILITY}, {LAPTOP#CONNECTIVITY}
         b.    The exotic food is beautifully presented and is a delight 
in delicious combinations. → {FOOD#STYLE_OPTIONS}, {FOOD#QUALITY}

     Slot 2 (Only for the restaurants domain): Opinion Target Expression 
(OTE). An opinion target expression (OTE) is an expression used in the 
given text to refer to the reviewed entity E of a pair E#A. The OTE is 
defined by its starting and ending offsets in the given text. The OTE 
slot takes the value “NULL”, when there is no (explicit) mention of the 
entity E. Below are some examples:

         a.    Great for a romantic evening, but over-priced.  → 
{AMBIENCE#GENERAL, “NULL”}, {RESTAURANT# PRICES, “NULL”}
         b.    The fajitas were delicious, but expensive. → 
{FOOD#QUALITY, “fajitas”}, {FOOD# PRICES, “fajitas”}

     Slot 3: Sentiment Polarity. Each identified E#A pair of the given 
text has to be assigned a polarity (positive, negative, or neutral). The 
neutral label applies to mildly positive or mildly negative sentiment, 
as in the second example below.

         a.    The applications are also very easy to find and 
maneuver.  → {SOFTWARE#USABILITY, positive}
         b.    The fajitas are nothing out of the ordinary”.  → 
{FOOD#GENERAL, “fajitas”, neutral}

Subtask 2: Out-of-domain ABSA
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The participating teams will be asked to test their systems in a 
previously unseen domain for which no training data will be made 
available. The gold annotations for Slot1 will be provided and the teams 
will be required to return annotations for Slot 3 (sentiment polarity) 
only.


DATASETS
****************************************************
Two datasets of ~550 reviews of laptops and restaurants annotated as 
above are already available for training. Additional datasets will be 
provided to evaluate the participating systems in Subtask 1 (in-domain 
ABSA). Information about the domain adaptation dataset of Subtask 2 
(out-of-domain ABSA) will be provided later.


IMPORTANT DATES
****************************************************
Evaluation period starts: December 5, 2014
Evaluation period ends: December 22, 2014
Paper submission due: January 30, 2015
Paper reviews due: February 28, 2015
Camera ready due: March 30, 2015
SemEval workshop: June 4-5, 2015 (co-located with NAACL-2015 in Denver, 
Colorado)

MORE INFORMATION
****************************************************
The Semeval-2015 Task 12 website includes further details on the 
training data, evaluation, and examples of expected system outputs:
http://alt.qcri.org/semeval2015/task12/

Registration at: http://alt.qcri.org/semeval2015/index.php?id=registration
Join our mailing list: https://groups.google.com/d/forum/semeval-absa
Email: semeval-absa at googlegroups.com

ORGANIZERS
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Ion Androutsopoulos (Athens University of Economics and Business, Greece)
Dimitris Galanis (“Athena” Research Center, Greece)
Suresh Manandhar (University of York, UK) [Primary Contact]
Harris Papageorgiou ("Athena" Research Center, Greece)
John Pavlopoulos (Athens University of Economics and Business, Greece)
Maria Pontiki (“Athena” Research Center, Greece)



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