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Theses

Analyse des sentiments : système autonome d'exploration des opinions exprimées dans les critiques cinématographiques

Abstract : This thesis describes the study and development of a system designed for the evaluation of sentiments within cinema reviews. Such a system offers :
- an automatic search of reviews on the Internet,
- the valuation and the attribution of marks to the opinions given by cinema critics,
- the publication of the results.

In order to improve the application results of predictive algorithms the objective of this system is to supply a support system for the prediction engines analysing users profiles. Firstly the system seeks and fetches likely reviews by cinema reviewers on the internet, particularly those who are prolific. Then the system will evaluate and attribute a mark to the opinion expressed in the cinema reviews and automatically associate a numerical mark to each review ; this is the objective of the system. The final stage is to regroup the reviews (as well as the marks) with the user who wrote them so as to create complete profiles and to propose these profiles the prediction engines.

For the development of this system research for this thesis was based principally on the marking of sentiments, this work is in the realm of Opinion Mining and Sentiment Analysis. Our system uses three different methods for the classification of opinions. We present here two new methods ; one founded on pure linguistic knowledge and the other on a combination of statistic and linguistic analysis. Subsequently the results are compared using the statistical method based on Bayes' classifier frequently used in this domain.

The ensuing results are then combined in order to make the final evaluation as precise as possible. For this task we used a fourth classifier based on the neuron network.
Between one and five points are attributed to reviews. This mark requires a deeper linguistic analysis than the binary notation- positive/negative which may be objective or subjective and which is habitually used.

This thesis gives a general account of all the system modules which we have created and a detailed analysis of the one dedicated to opinion marking. We wish to show the dvantages of deep linguistic analysis which is less commonly used than statistical analysis in the domain of sentiment analysis.
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Submitted on : Monday, August 3, 2009 - 11:23:05 AM
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  • HAL Id : tel-00408754, version 1

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Grzegorz Dziczkowski. Analyse des sentiments : système autonome d'exploration des opinions exprimées dans les critiques cinématographiques. Automatique / Robotique. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1637⟩. ⟨tel-00408754⟩

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