WO2013185855A1 - A method of assigning a topic tag - Google Patents

A method of assigning a topic tag Download PDF

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Publication number
WO2013185855A1
WO2013185855A1 PCT/EP2012/069877 EP2012069877W WO2013185855A1 WO 2013185855 A1 WO2013185855 A1 WO 2013185855A1 EP 2012069877 W EP2012069877 W EP 2012069877W WO 2013185855 A1 WO2013185855 A1 WO 2013185855A1
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WO
WIPO (PCT)
Prior art keywords
topic
tag
user
assigned
text message
Prior art date
Application number
PCT/EP2012/069877
Other languages
French (fr)
Inventor
Kareem Darwish
Ali EL-KAHKI
Original Assignee
Qatar Foundation
Hoarton, Lloyd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qatar Foundation, Hoarton, Lloyd filed Critical Qatar Foundation
Publication of WO2013185855A1 publication Critical patent/WO2013185855A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
    • G06F16/38—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually

Definitions

  • the present invention relates to a method of assigning a topic tag to an electronic text message, and more particularly relates to a method of assigning a topic tag to a microblog.
  • Microblogging involves the posting of electronic text messages by user which are usually in the form of short sentences, commonly referred to as microblogs.
  • a user posts a microblog via a microblogging platform to share the microblog with other users.
  • Twitter is one of the most commonly used microblogging platforms which allows users to post microblogs, known as tweets, which comprise an electronic text message consisting of up to 140 text characters.
  • a user often includes a topic tag, or hashtag, in microblogs to help other users find microblogs of interest.
  • a topic tag is usually included in a microblog by placing a hash symbol (#) in front of a word or phrase to mark the word or phrase as a topic tag or hashtag.
  • Top tags are normally defined by the users themselves and they do not adhere to a pre-defined taxonomy. This can lead to a microblog author using topic tags which do not allow microblogs to be identified easily because the topic tags are too specific, too general , unpopular, often used for spam, outdated etc.
  • Microblogs are becoming a common form of sharing information and many millions of microblogs are posted around the world each day. There is a need to improve the relevance of topic tags used in microblogs to enable information to be shared more effectively.
  • the present invention seeks to provide an improved method of assigning a topic tag to an electronic text message.
  • One aspect of the present invention provides a method of assigning a topic tag to an electronic text message, the method comprising: detecting a topic tag which is pre-assigned to the text message; analysing the text message using a topic modelling technique to identify at least one topic which is related to the content of the text message; identifying at least one topic tag which defines the at least one identified topic; comparing the pre-assigned topic tag with the topic identified using the topic modell ing technique; providing feedback information to a user regarding the comparison and an indication of whether the pre-assigned topic tag or at least one of the identified topic tags should be assigned to the electronic text message.
  • the electronic text message is a microblog.
  • the topic modelling technique is selected from a group consisting of latent semantic analysis, probabilistic latent semantic analysis, latent Dirichlet allocation and na ' fve Bayesian classification.
  • the method further comprises suggesting to the user at least one topic tag which is more relevant to the topic of the electronic text message than the pre-assigned topic tag.
  • the method further comprises suggesting to the user at least one further topic tag identified using the topic modelling technique which is related to the same topic as the pre-assigned topic tag.
  • the method further comprises comparing the pre-assigned topic tag with a plurality of topic tags available to the user via an electronic text message system and providing an indication to the user of the popularity of the pre-assigned topic tag when compared with the plurality of further topic tags available to the user via the electronic text message system.
  • the method further comprises suggesting to the user at least one further topic tag which is more popular in the electronic text message system than the user-defined topic tag.
  • the method further comprises comparing the user-defined topic tag with at least one topic tag which is categorised as electronic spam and providing an indication to the user if the user-defined topic tag at least partly matches a topic tag categorised as electronic spam.
  • Figure 1 is a schematic diagram illustrating the relationship between the latent topic of a microblog and a topic tag
  • Figure 2 is a schematic diagram showing a comparison between a good topic tag and a spam topic tag
  • Figure 3 is a schematic diagram illustrating a similar distribution of probability masses of a topic tag for two similar topic tags
  • Figure 4 is a schematic diagram illustrating a similar distribution of probability masses of a topic tag where a first topic tag is more specific than a second topic tag.
  • An embodiment of the present invention analyses an electronic text message, referred to hereinafter as a microblog.
  • a microblog incorporates raw message text and can also incorporate one or more of an explicit initial topic tag (a hashtag), an explicit ID marker (@) a timestamp or source information (@).
  • An embodiment of the invention detects an explicit initial topic tag which is pre- assigned to a microblog, for instance by the author of the microblog.
  • the raw electronic text in the microblog is then analysed using a topic modelling technique to identify latent or hidden topics related to the content of the microblog.
  • a topic modelling technique typically uses graphical models, such as Latent Dirichlet Allocation (LDA) to attempt to find latent or hidden topics in the text of a microblog.
  • LDA Latent Dirichlet Allocation
  • Other topic modelling techniques which are employed by embodiments of the invention include latent semantic analysis, probabilistic latent semantic analysis and na ' fve Bayesian classification.
  • Topic modelling is performed on microblogs automatically or in a semi- supervised manner.
  • Microblogs are assumed to be generated using at least one latent topic which, in turn, is/are produced by one or more topic tags included in each microblog.
  • Microblogs are usually very short (e.g. up to 140 characters) and so one can assume that each microblog is generated using only one latent topic. Longer text documents can, however, be generated using multiple latent topics.
  • a method of an embodiment of the invention uses a topic modelling technique to identify at least one topic which is relevant to the content of the microblog and identifies at least one topic tag which defines the at least one identified topic.
  • Embodiments of the invention use graphical models for topic modelling. The graphical models can be traversed in any direction so that a latent topic can be used to identify words or appropriate topic tags.
  • a pre- assigned topic tag can be analysed using a topic modelling technique to detect latent topics in a microblog.
  • the latent topic linking the words in a microblog and a visible topic tag is shown in figure 1 .
  • Embodiments of the invention use topic modelling techniques to detect the link between the words in a microblog and a pre- assigned topic tag.
  • Embodiments of the invention provide feedback information to a user regarding the topic tag identified using topic modelling to assist the user in tagging the microblog with at least one topic tag.
  • One embodiment of the invention compares the topic identified from a microblog using topic modelling with each pre-assigned topic tag and suggests alternative topic tags to the user.
  • the user can then tag the microblog with at least one of the identified topic tags to ensure that the microblog is tagged with at least one topic tag which is relevant to the at least one latent topic of the microblog.
  • the method therefore suggests suitable topic tags to a user to allow the topic tags to be focussed more specifically on the latent topic than a broad topic tag selected by the user or to suggest topic tags with a broader focus than topic tags selected by the user which are too specific. This allows a user to select topic tags with an appropriate relevance to maximise the chance of the topic tag being identified by other users interested in the or each latent topic of a microblog.
  • the method compares each pre-assigned topic tag with other topic tags available to users via a microblogging platform.
  • Two topic tags are equivalent if their latent topic distributions are similar.
  • a similar distribution of two topic tags is illustrated in figure 2 where the line weights reflect the relative magnitude of a topic for each tag.
  • the method can detect which of the two similar tags is more popular by counting the number of topics that are related to each tag.
  • the latent topic distribution of a pre-assigned topic tag is analysed using a topic modelling technique and compared with other topic tags available to users via the microblogging system.
  • the method identifies that the user-defined topic tag is a topic tag commonly used by spammers.
  • Figure 3 illustrates the probability mass distribution of a good topic tag and a topic tag used by spammers.
  • the line weights in figure 3 represent the relative magnitude of a topic for each tag.
  • Figure 4 illustrates the mass distributions of two topic tags. Again, the line weights in figure 4 represent the relative magnitude of a topic for each tag.
  • Topic tag 1 is more specific than topic tag 2 because the probability mass of topic tag 1 is distributed on a fewer number of topics with a higher probability for each topic than topic tag 2.

Abstract

A microblog is a short text message that usually comprises a topic tag that enables others to locate the microblog. A method of assigning a topic tag to a microblog comprises detecting a topic tag which is pre-assigned to the microblog. The microblog is analysed using a topic modelling technique to identify at least one topic which is related to the microblog. The method compares the pre-assigned topic tag with the topic identified using the topic modelling technique and provides feedback to a user and an indication of whether the pre-assigned topic tag or at least one of the identified topic tags should be assigned to the microblog.

Description

Title: A Method of Assigning a Topic Tag Description of Invention
The present invention relates to a method of assigning a topic tag to an electronic text message, and more particularly relates to a method of assigning a topic tag to a microblog.
Microblogging involves the posting of electronic text messages by user which are usually in the form of short sentences, commonly referred to as microblogs. A user posts a microblog via a microblogging platform to share the microblog with other users. Twitter is one of the most commonly used microblogging platforms which allows users to post microblogs, known as tweets, which comprise an electronic text message consisting of up to 140 text characters.
A user often includes a topic tag, or hashtag, in microblogs to help other users find microblogs of interest. A topic tag is usually included in a microblog by placing a hash symbol (#) in front of a word or phrase to mark the word or phrase as a topic tag or hashtag. Top tags are normally defined by the users themselves and they do not adhere to a pre-defined taxonomy. This can lead to a microblog author using topic tags which do not allow microblogs to be identified easily because the topic tags are too specific, too general , unpopular, often used for spam, outdated etc.
Microblogs are becoming a common form of sharing information and many millions of microblogs are posted around the world each day. There is a need to improve the relevance of topic tags used in microblogs to enable information to be shared more effectively. The present invention seeks to provide an improved method of assigning a topic tag to an electronic text message. One aspect of the present invention provides a method of assigning a topic tag to an electronic text message, the method comprising: detecting a topic tag which is pre-assigned to the text message; analysing the text message using a topic modelling technique to identify at least one topic which is related to the content of the text message; identifying at least one topic tag which defines the at least one identified topic; comparing the pre-assigned topic tag with the topic identified using the topic modell ing technique; providing feedback information to a user regarding the comparison and an indication of whether the pre-assigned topic tag or at least one of the identified topic tags should be assigned to the electronic text message.
Preferably, the electronic text message is a microblog.
Conveniently, the topic modelling technique is selected from a group consisting of latent semantic analysis, probabilistic latent semantic analysis, latent Dirichlet allocation and na'fve Bayesian classification.
Advantageously, the method further comprises suggesting to the user at least one topic tag which is more relevant to the topic of the electronic text message than the pre-assigned topic tag.
Preferably, the method further comprises suggesting to the user at least one further topic tag identified using the topic modelling technique which is related to the same topic as the pre-assigned topic tag. Conveniently, the method further comprises comparing the pre-assigned topic tag with a plurality of topic tags available to the user via an electronic text message system and providing an indication to the user of the popularity of the pre-assigned topic tag when compared with the plurality of further topic tags available to the user via the electronic text message system. Advantageously, the method further comprises suggesting to the user at least one further topic tag which is more popular in the electronic text message system than the user-defined topic tag.
Preferably, the method further comprises comparing the user-defined topic tag with at least one topic tag which is categorised as electronic spam and providing an indication to the user if the user-defined topic tag at least partly matches a topic tag categorised as electronic spam.
In order that the invention may be more readily understood, and so that further features thereof may be appreciated, embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a schematic diagram illustrating the relationship between the latent topic of a microblog and a topic tag,
Figure 2 is a schematic diagram showing a comparison between a good topic tag and a spam topic tag, Figure 3 is a schematic diagram illustrating a similar distribution of probability masses of a topic tag for two similar topic tags, and
Figure 4 is a schematic diagram illustrating a similar distribution of probability masses of a topic tag where a first topic tag is more specific than a second topic tag. Correct microblog authoring has commercial value and so many authors, particularly commercial entities, wish to improve the visibility of their microblogs. Using correct topic tags can greatly enhance the discoverability and hence visibility of microblogs.
An embodiment of the present invention analyses an electronic text message, referred to hereinafter as a microblog. A microblog incorporates raw message text and can also incorporate one or more of an explicit initial topic tag (a hashtag), an explicit ID marker (@) a timestamp or source information (@).
An embodiment of the invention detects an explicit initial topic tag which is pre- assigned to a microblog, for instance by the author of the microblog. The raw electronic text in the microblog is then analysed using a topic modelling technique to identify latent or hidden topics related to the content of the microblog. A topic modelling technique typically uses graphical models, such as Latent Dirichlet Allocation (LDA) to attempt to find latent or hidden topics in the text of a microblog. Other topic modelling techniques which are employed by embodiments of the invention include latent semantic analysis, probabilistic latent semantic analysis and na'fve Bayesian classification.
Topic modelling is performed on microblogs automatically or in a semi- supervised manner. Microblogs are assumed to be generated using at least one latent topic which, in turn, is/are produced by one or more topic tags included in each microblog. Microblogs are usually very short (e.g. up to 140 characters) and so one can assume that each microblog is generated using only one latent topic. Longer text documents can, however, be generated using multiple latent topics.
A method of an embodiment of the invention uses a topic modelling technique to identify at least one topic which is relevant to the content of the microblog and identifies at least one topic tag which defines the at least one identified topic. Embodiments of the invention use graphical models for topic modelling. The graphical models can be traversed in any direction so that a latent topic can be used to identify words or appropriate topic tags. In addition, a pre- assigned topic tag can be analysed using a topic modelling technique to detect latent topics in a microblog.
The latent topic linking the words in a microblog and a visible topic tag is shown in figure 1 . Embodiments of the invention use topic modelling techniques to detect the link between the words in a microblog and a pre- assigned topic tag.
Embodiments of the invention provide feedback information to a user regarding the topic tag identified using topic modelling to assist the user in tagging the microblog with at least one topic tag.
One embodiment of the invention compares the topic identified from a microblog using topic modelling with each pre-assigned topic tag and suggests alternative topic tags to the user. The user can then tag the microblog with at least one of the identified topic tags to ensure that the microblog is tagged with at least one topic tag which is relevant to the at least one latent topic of the microblog. The method therefore suggests suitable topic tags to a user to allow the topic tags to be focussed more specifically on the latent topic than a broad topic tag selected by the user or to suggest topic tags with a broader focus than topic tags selected by the user which are too specific. This allows a user to select topic tags with an appropriate relevance to maximise the chance of the topic tag being identified by other users interested in the or each latent topic of a microblog.
In another embodiment, the method compares each pre-assigned topic tag with other topic tags available to users via a microblogging platform. Two topic tags are equivalent if their latent topic distributions are similar. A similar distribution of two topic tags is illustrated in figure 2 where the line weights reflect the relative magnitude of a topic for each tag. The method can detect which of the two similar tags is more popular by counting the number of topics that are related to each tag. In a further embodiment, the latent topic distribution of a pre-assigned topic tag is analysed using a topic modelling technique and compared with other topic tags available to users via the microblogging system. If the latent topic distribution of the pre-assigned tag is uniform or almost uniform or the probability mass is distributed evenly on many topics, then the method identifies that the user-defined topic tag is a topic tag commonly used by spammers. Figure 3 illustrates the probability mass distribution of a good topic tag and a topic tag used by spammers. The line weights in figure 3 represent the relative magnitude of a topic for each tag. Figure 4 illustrates the mass distributions of two topic tags. Again, the line weights in figure 4 represent the relative magnitude of a topic for each tag. Topic tag 1 is more specific than topic tag 2 because the probability mass of topic tag 1 is distributed on a fewer number of topics with a higher probability for each topic than topic tag 2.
When used in this specification and claims, the terms "comprises" and "comprising" and variations thereof mean that the specified features, steps or integers are included . The terms are not to be interpreted to exclude the presence of other features, steps or components.

Claims

Claims
1 . A method of assigning a topic tag to an electronic text message, the method comprising:
detecting a topic tag which is pre-assigned to the text message;
analysing the text message using a topic modelling technique to identify at least one topic which is related to the content of the text message;
identifying at least one topic tag which defines the at least one identified topic;
comparing the pre-assigned topic tag with the topic identified using the topic modelling technique;
providing feedback information to a user regarding the comparison and an indication of whether the pre-assigned topic tag or at least one of the identified topic tags should be assigned to the electronic text message.
2. A method according to claim 1 , wherein the electronic text message is a microblog.
3. A method according to claim 1 or claim 2, wherein the topic modelling technique is selected from a group consisting of latent semantic analysis, probabilistic latent semantic analysis, latent dirichlet allocation and na'fve Bayesian classification.
4. A method according to any one of the preceding claims, wherein the method further comprises suggesting to the user at least one topic tag which is more relevant to the topic of the electronic text message than the pre-assigned topic tag.
5. A method according to any one of the preceding claims, wherein the method further comprises suggesting to the user at least one further topic tag identified using the topic modelling technique which is related to the same topic as the pre-assigned topic tag.
6. A method according to any one of the preceding claims wherein the method further comprises comparing the pre-assigned topic tag with a plurality of topic tags available to the user via an electronic text message system and providing an indication to the user of the popularity of the pre-assigned topic tag when compared with the plurality of further topic tags available to the user via the electronic text message system.
7. A method according to claim 6, wherein the method further comprises suggesting to the user at least one further topic tag which is more popular in the electronic text message system than the user-defined topic tag.
8. A method according to any one of the preceding claims, wherein the method further comprises comparing the user-defined topic tag with at least one topic tag which is categorised as electronic spam and providing an indication to the user if the user-defined topic tag at least partly matches a topic tag categorised as electronic spam.
PCT/EP2012/069877 2012-06-15 2012-10-08 A method of assigning a topic tag WO2013185855A1 (en)

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CN108536868A (en) * 2018-04-24 2018-09-14 北京慧闻科技发展有限公司 The data processing method of short text data and application on social networks
CN108536868B (en) * 2018-04-24 2022-04-15 北京慧闻科技(集团)有限公司 Data processing method and device for short text data on social network

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