[eas_cs_seminars] 21st March 2017

[Luca Rossi]

Hi all,

This is a reminder of tomorrow's talk "Online Ensemble Learning of Data
Streams with Gradually Evolved Classes" Dr. Leandro Minku (
http://www.cs.le.ac.uk/people/llm11/) (mb220, 2pm to 3pm).

Best,
Luca

On 16 March 2017 at 15:16, Luca Rossi <l.rossi at aston.ac.uk> wrote:

> Dear all,
>
> The next CS seminar will be on Tuesday 21/03 from 2pm to 3pm in MB220.
> Dr. Leandro Minku (http://www.cs.le.ac.uk/people/llm11/) will be giving a
> talk titled "Online Ensemble Learning of Data Streams with Gradually
> Evolved Classes".
>
> Abstract:
> In machine learning, class evolution is the phenomenon of class emergence
> and disappearance. It is likely to occur in many data stream problems,
> which are problems where additional training data become available over
> time. For example, in the problem of classifying tweets according to their
> topic, new topics may emerge over time, and certain topics may become
> unpopular and not discussed anymore. Therefore, class evolution is an
> important research topic in the area of learning data streams. Existing
> work implicitly regards class evolution as an abrupt change. However, in
> many real world problems, classes emerge or disappear gradually. This gives
> rise to extra challenges, such as non-stationary imbalance ratios between
> the different classes in the problem. In this talk, I will present an
> ensemble approach able to deal with gradually evolved classes. In order to
> quickly adjust to class evolution, the ensemble maintains a base learner
> for each class and dynamically creates, updates and (de)activates base
> learners whenever new training data become available. It also uses a
> dynamic undersampling technique in order to deal with the non-stationary
> class imbalance present in this type of problem. Empirical studies
> demonstrate the effectiveness of the proposed approach in various class
> evolution scenarios in comparison with existing class evolution approaches.
>
> See you all next week,
> Luca
> --
> Luca Rossi
>
> Lecturer in Computer Science
> School of Engineering and Applied Science
> Aston University
> Web: http://www.cs.aston.ac.uk/~rossil/
> <http://www.cs.bham.ac.uk/~rossil/>
>



-- 
Luca Rossi

Lecturer in Computer Science
School of Engineering and Applied Science
Aston University
Web: http://www.cs.aston.ac.uk/~rossil/ <http://www.cs.bham.ac.uk/~rossil/>
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