Connectionists: Research engineer or post-doc position in Natural Language Processing (LORIA, France)

[Irina Illina]

Research engineer or post-doc position in Natural Language Processing: Introduction of semantic information in a speech recognition system 

Supervisors: Irina Illina, MdC, Dominique Fohr, CR CNRS 

Team: Multispeech, LORIA-INRIA (https://team.inria.fr/multispeech/) 

Contact: illina at loria.fr, dominique.fohr at loria.fr 

Duration: 12-18 months 

Deadline to apply : January 10th, 2019 

Required skills: Strong background in mathematics, machine learning (DNN), statistics, natural language processing and computer program skills (Perl, Python). 

Following profiles are welcome, either: 

· Strong background in signal processing 

or 

· Strong experience with natural language processing 

Excellent English writing and speaking skills are required in any case. 

Candidates should email a detailed CV with diploma 

LORIA is the French acronym for the “Lorraine Research Laboratory in Computer Science and its Applications” and is a research unit (UMR 7503), common to [ http://www.cnrs.fr/index.php | CNRS ] , the [ http://vers.univ-lorraine.fr/ | University of Lorraine ] and [ http://www.inria.fr/en/ | INRIA ] . This unit was officially created in 1997. Loria’s missions mainly deal with fundamental and applied research in computer sciences. 

MULTISPEECH is a joint research team between the Université of Lorraine, Inria, and CNRS. Its research focuses on speech processing, with particular emphasis to multisource (source separation, robust speech recognition), multilingual (computer assisted language learning), and multimodal aspects (audiovisual synthesis). 

Context and objectives 

Under noisy conditions, audio acquisition is one of the toughest challenges to have a successful automatic speech recognition (ASR). Much of the success relies on the ability to attenuate ambient noise in the signal and to take it into account in the acoustic model used by the ASR. Our DNN (Deep Neural Network) denoising system and our approach to exploiting uncertainties have shown their combined effectiveness against noisy speech. 

The ASR stage will be supplemented by a semantic analysis. Predictive representations using continuous vectors have been shown to capture the semantic characteristics of words and their context, and to overcome representations based on counting words. Semantic analysis will be performed by combining predictive representations using continuous vectors and uncertainty on denoising. This combination will be done by the rescoring component. All our models will be based on the powerful technologies of DNN. 

The performances of the various modules will be evaluated on artificially noisy speech signals and on real noisy data. At the end, a demonstrator, integrating all the modules, will be set up. 

Main activities 

• study and implementation of a noisy speech enhancement module and a propagation of uncertainty module; 

• design a semantic analysis module; 

• design a module taking into account the semantic and uncertainty information. 

References 

[Nathwani et al ., 2018] Nathwani, K., Vincent, E., and Illina, I. DNN uncertainty propagation using GMM-derived uncertainty features for noise robust ASR, IEEE Signal Processing Letters , 2018. 

[Nathwani et al ., 2017] Nathwani, K., Vincent, E., and Illina, I. Consistent DNN uncertainty training and decoding for robust ASR, in Proc. IEEE Automatic Speech Recognition and Understanding Workshop , 2017. 

[Nugraha et al., 2016] Nugraha, A., Liutkus, A., Vincent E. Multichannel audio source separation with deep neural networks. IEEE/ACM Transactions on Audio, Speech, and Language Processing , 2016. 

[Sheikh, 2016] Sheikh, I. Exploitation du contexte sémantique pour améliorer la reconnaissance des noms propres dans les documents audio diachroniques”, These de doctorat en Informatique, Université de Lorraine, 2016. 

[Sheikh et al., 2016] Sheikh, I. Illina, I. Fohr, D. Linares, G. Learning word importance with the neural bag-of-words model, in Proc. ACL Representation Learning for NLP (Repl4NLP) Workshop, Aug 2016. 

[Mikolov et al., 2013a] Mikolov, T. Chen, K., Corrado, G., and Dean, J. Efficient estimation of word representations in vector space, CoRR , vol. abs/1301.3781, 2013. 

-- 
Associate Professor 
Lorraine University 
LORIA-INRIA 
office C147 
Building C 
615 rue du Jardin Botanique 
54600 Villers-les-Nancy Cedex 
Tel:+ 33 3 54 95 84 90 
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