Offre en lien avec l’Action/le Réseau : – — –/– — –

Laboratoire/Entreprise : CRIStAL (Lille, France), NUS (Singapore)
Durée : 3 years
Contact : remi.bardenet@gmail.com
Date limite de publication : 2022-07-31

Contexte :
URL: http://rbardenet.github.io/pdf/phd-proposal.pdf
Context: “Baccarat” AI chair.
Supervisors: Rémi Bardenet (CNRS, Univ. Lille) and Subhro Ghosh (NUS, Singapore).

A point process is a random discrete set of points in a generic space. A broad interest has emerged in ML and signal processing around point processes that exhibit a regular, repulsive arrangement of their points. For instance, sampling repulsive (i.e., diverse) minibatches yields variance reduction in stochastic gradient descent (Bardenet, Ghosh, and Lin, NeurIPS 2021). As another example, moments of pure silence in the musical score of white noise are a repulsive point process that can be leveraged for signal detection (Bardenet, Flamant, and Chainais, ACHA 2020).

Sujet :
To get acquainted with the interdisciplinary topic of repulsive point processes, we shall start with a project that fits in ongoing collaboration between the two supervisors. Ideally, this project shall be tackled during a master’s level internship prior to starting the PhD. Depending on the student’s background and taste, this can be, e.g., (i) topological data analysis applied to the zeros of random spectrograms (the technical for a time-frequency musical score). Alternately, the internship could revolve around (ii) negatively dependent subsampling for large-scale machine learning. For instance, how can we efficiently build repulsive minibatches in stochastic gradient descent?

After this first project, the three of us will pick an ambitious open problem in line with the objectives of the Baccarat AI chair, according to the student’s interest. Candidate problems include identifying and studying repulsive point processes for high-dimensional Monte Carlo integration, fast sampling algorithms for determinantal point processes in machine learning, dictionary learning for signal processing, or studying zeros of wavelet transforms of random signals to use them in filtering tasks.

Profil du candidat :
The ideal candidate has a strong background in either probability, statistics, ML, or signal processing, and a taste for interdisciplinarity.

Formation et compétences requises :
A master in either probability, statistics, ML, or signal processing.

Adresse d’emploi :
Centre de recherche en informatique, signal et automatique de Lille; Department of Statistics and Data Science, National University of Singapore.

Offre en lien avec l’Action/le Réseau : – — –/Doctorants

Laboratoire/Entreprise : L3i / Easychain
Durée : 36 mois
Contact : mickael.coustaty@univ-lr.fr
Date limite de publication : 2022-04-10

Contexte :
The pandemic that we have just experienced has accelerated the dematerialisation of our exchanges and intensified the need to provide quick and relevant answers at any time. This digital shift practically brings new challenges. Users would maintain the same level of satisfaction in their practices and companies by offering efficient online services. Whether in stores or on the Web, consumers’ expectations are increasing: they want to be able to do everything quickly, easily and efficiently. Therefore, companies should be able to respond to their customers in person (in their establishment) rather than online using their digital platforms. Easychain, a young company that produces software and services dedicated to real estate brokers, aims to anticipate the requirements of its customers and future owners. This problem leads to a strong need to provide answers through chatbots, also known
as conversational agents, in order to satisfy the customers.

EasyChain is a young company based in Niort (France) that publishes tools using Artificial Intelligence. Its first customers are real estate credit brokers, the company addresses the entire real estate sphere, from the buyer to the seller, including notaries, real estate agents, banks and bailiffs. With the arrival of the millenniums on the labour market, the professions connected with real estate will undergo major changes over the next few years: digitalisation and artificial intelligence are the main challenges. In order to meet these future challenges, the company has developed the following tools:
• a tool for recognising and classifying standard and non-standard documents, with extraction of important information, feeding, among other things, a business CRM;
• a mobile application that enables the transfer of spoken and written information, encrypted from end to end. It is a “WhatsApp-like” application extended and dedicated to the real estate credit sphere.

These tools, which are unique on the market, are the very beginning of the automation of the entire credit processing chain. In order to go further in this logic, Easychain aims to complete them with voice chatbots, robots that analyse applications, qualify their eligibility, and process them as a whole. The team is currently composed of AI researchers, mathematicians, software developers, digital specialists,
and business experts.

In order to work on the development of these Chatbot solutions, Easychain would collaborate with the L3i laboratory at La Rochelle University. Created in 1993, the L3i (informatique, image, interaction
computer Science, image, interaction) laboratory is the research laboratory for digital sciences at La Rochelle University. It has about 100 members working in the fields of computer Science, image processing and Interaction. The research fields at L3i concern the interactive and intelligent management of digital content. More specifically, the work carried out within the framework of this collaboration concerns the Images and Contents team. Its core business concerns low-level processing techniques of weakly structured contents (images, texts, videos, native and digitized digital documents, …), as well as the analysis, management and linking of data extracted from such contents (feature extraction, indexing, mining or information retrieval).

In order to improve the quality of its customer relations, Easychain would develop, in collaboration with L3i, a conversational agent. This agent, commonly called Chatbot, should allow:
• answering common questions: customer service is often involved to answer the same questions: problems to login, banking procedures, how to get a home loan, etc. A chatbot will answer these questions. Thus, the support team will have more time devoted to important issues;
• Written or spoken chat: it must be able to consider the customer’s messages either in text or voice and propose an appropriate answer;
• User profile analysis: it is also necessary, not only the emotions, the feelings but also the answer, the way of asking questions, the speech, etc. Based on all the information, the chatbot will be able to adapt its answers.

This chatbot will be integrated in all the tools and services developed by Easychain such as – WeasyFile — a tool for automatic recognition and reading of documents — or ConnectCrédit — a mobile application to ease exchanges between brokers and real estate agencies, etc.

Sujet :
Objectives:
In this particular context, the development of a conversational agent (chatbot) is a necessary response to facilitate communication, by voice or text, with any human being using interactive skills. Generally speaking, chatbots can be seen as computer programs that rely on Machine Learning and Artificial Intelligence (AI) methods to choose the best response based on previous interactions. In this thesis, we want to propose a multimodal conversational agent, able to answer in text or voice according to the modality chosen or entered by the customer. Moreover, this agent will have to be able to extract the domain of the conversation and to detect information about the customer’s feelings (emotion and sentiment analysis) in order to reduce the “robot” effect of existing agents. These objectives are directly linked to two major research areas: Natural Language Processing (NLP) and Natural Language Understanding (NLU). The languages studied by this chatbot will be primarily French and English.

The problem is to take advantage from knowledge and methods dedicated to linguistic analysis such as: morphological analysis, lexical and semantic knowledge, etc.) to achieve two objectives:
– The chatbot must perform a natural language conversation with customers comparable to an exchange between two humans. It is based on language models adapted to the processing of a customer’s file;
– The chatbot must be linked to a voice synthesiser to offer a voice dialogue option with the customer;
– The chatbot must be open domain, meaning that it must be able to adapt its conversation according to its domain;
– The chatbot must be able to analyse the customer’s emotions in real time to determine the best way to respond and dialogue with the customer according to his emotions.

Challenges:
The main challenges are:
– Interpretation of different customer demands: the method must be generic and not based on domain-specific rules;
– Examination of user behaviours: ability to identify and adapt to different customer behaviours, including the modality used to communicate
Brief state of the art and positioning
Several researches have been focused on the design of chatbots. The very first known chatbot was developed in 1966 [1]. It used a simple pattern matching to propose answers (only) to questions. The efforts have then continued on the modelling of a knowledge base used by chatbots such as ontologies, or semantic networks that link a set of hierarchically interconnected concepts [2, 3]. The purpose of using knowledge bases in a chatbot is to compute relations between these concepts, such as synonyms, hyponyms, etc. [3]. The interconnection between these concepts can be represented in a graph allowing the chatbot to search using particular reasoning rules. If the entry is not found in the knowledge base, a default answer is generated. In order to overcome the limits of knowledge bases in terms of coverage of various domains, several research works have therefore used language models in order to semantically analyse the queries (input sentences) with a decent accuracy [4,5].
Existing chatbots suffer from two limitations: 1) model capacity and 2) scarcity of generic data. With the recent success of large pre-trained language models [6-7], which are very effective at encoding semantics [8-9], both problems can be mitigated. The first work to be carried out in this thesis will focus on the use and adaptation of these pre-trained language models on very large databases. The goal consists in generating grammatically and semantically consistent responses rather than adding a domain learning scenario with a goal of classifying dialogue emotions. For example, if the caller says “I am really satisfied with your first article and I look forward the second one”; the chatbot should be able to detect this positive impression of the customer and to adapt in real-time the conversation according to this emotion.
Concerning the opinion analysis and considering the user’s feeling in the answers that the system should give, many works have been done in the literature. The analysis of feelings is a task of Natural Language Processing (NLP). NLP aims at extracting feelings and opinions from texts as presented in [10,11]. In addition, new sentiment analysis techniques are beginning to incorporate information from text and other modalities such as visual data [12,13]. This research topic falls within the field of affective computing and emotion recognition [12]. According to [14], affective computing and sentiment analysis are the keys to the development of artificial intelligence (AI). Moreover, they have great potential when applied to various domains or systems. The task of sentiment analysis can then be viewed as a text classification problem [15-17], as the process involves several operations that result in classifying whether a given text expresses a positive or negative sentiment.
However, although sentiment analysis may seem like an easy process, it actually requires the consideration of many factors not currently addressed by NLP researchers such as sarcasm and subjectivity detection [18,19]. Moreover, the lack of apparent structure (specific to books or newspapers) that can clearly be found in vocal exchanges with clients remains a major problem for the community [20,21].
The proposed method in this research work should define a natural language dialogue system independent of knowledge bases and/or complete models (closed world hypothesis) which are generally cumbersome and incomplete. For this purpose, we propose to study a solution that will rely on attention models [22] to detect the domain and identify its relevant terms. The chatbot will then have to decode the semantics of the terms using recent dynamic word embedding models, which have shown, in our recent work, good performances in several exercises such as information extraction [23] or named entity recognition and disambiguation [24,25]. The major novelty will then consist in developing new models able to integrate information related to the semantics of the content (word embedding, audio embedding [26]), to their context (attention model) and to the user’s feeling (sentiment analysis). The proposed system will then generate a response (text or audio) based on the semantic content, the domain and the user sentiment. The figure below describes a typical architecture of the expected chatbot.

Profil du candidat :
Anybody interested by reasearch in computer science

Formation et compétences requises :
Master degree in computer science (or equivalent)

Adresse d’emploi :

https://l3i.univ-larochelle.fr/spip.php?action=acceder_document&arg=1675&cle=18f8865a07a5837e135038516847ef81c846c59a&file=pdf%2Fcifre_phd_proposal_dynamic_human_agent_interactions_adapted_to_users_profiles_cle07da8a.pdf

Document attaché : 202202100910_cifre_phd_proposal_dynamic_human_agent_interactions_adapted_to_users_profiles_cle07da8a-1.pdf

Offre en lien avec l’Action/le Réseau : – — –/Doctorants

Laboratoire/Entreprise : L@bISEN Yncréa Ouest, Equipe Vision-AD
Durée : 3 ans
Contact : ayoub.karine@yncrea.fr
Date limite de publication : 2022-06-30

Contexte :
Suite à un désistement de la dernière minute. Nous cherchons un candidat pour la thèse CIFRE suivante.

Ces dernières années, la complexité de plus en plus croissante du monde économique ne cesse d’attirer l’attention des chercheurs et des industriels qui se lancent dans la digitalisation de leur entreprise. Plus particulièrement, les chaines d’approvisionnement et les milieux industriels comme les entrepôts et les réseaux de transport ne sont plus gérés comme des réalités singulières mais comme la résultante d’un ensemble d’interactions entre entités générant et partageant des données et des intérêts communs. Pour améliorer l’efficacité de la chaîne d’approvisionnement, il est primordial de pouvoir améliorer la prévision de la demande. Ceci a un impact sur la production, la planification des stocks, l’équilibrage de la demande et de l’offre, l’optimisation des processus de livraison et la réduction de ses délais, la prédiction des heures de pointe dans les centres logistiques et la planification des ressources humaines. D’un autre côté, comme ces entités sont imbriqués, les performances du système global sont directement liées aux performances des entités élémentaires. Les études récentes dans le domaine du management de la supply chain ont mis l’accent sur l’intérêt de la gestion décentralisée de ces entités.

Sujet :
– Objectif de la thèse :
L’objectif de la thèse consiste à répondre à la question suivante : comment réaliser une prévision à court terme pour les chaînes d’approvisionnement variées et décentralisées ? Les méthodes traditionnelles de prévision, y compris les techniques de séries chronologiques et de régression, ont été largement utilisées dans la prévision de la demande. Naïve, moyenne mobile, tendance, régression linéaire multiple, Holt-Winters, lissage exponentiel, ARIMA et ses variantes, font partie de ces techniques traditionnelles. Les approches basées sur l’apprentissage automatique, par renforcement, la SVM (Support vector machine), LSTM (Long Short-Term Memory) et les réseaux de neurones en général, font office de challengers dans le domaine de la prévision de la demande. Elles ont montré leur supériorité lorsque le nombre de variables prédictives est très grand, et quand les sources de données sont multiples. C’est le cas en environnement très variable, par exemple pour les produits sensibles aux intempéries ou les produits saisonniers, ou lorsque des dizaines de facteurs motivant les comportements d’achat ou de nombreux types de données sont impliqués, rendant la planification de la demande trop complexe pour être effectuée avec succès avec des outils classiques.
– Approches méthodologiques et techniques envisagées :
• Etat de l’art sur la modélisation et le traitement des données des milieux logistique afin d’améliorer l’existant
• Conception d’un outil de prévision et d’aide à la décision répondant à la problématique énoncée
• Vérification et test de la performance du système proposé en la comparant avec d’autres approches pratiques et théoriques
• Perspectives : proposer une approche qui prend en compte les acteurs et milieux logistiques

Profil du candidat :
Pour cette thèse, nous recherchons un(e) jeune doctorant(e) fortement motivé(e) et ayant un goût prononcé pour l’innovation. Il/elle devra participer au développement de prototypes qui s’intégreront dans les solutions utilisées par Generix Group et L@bISEN Yncréa Ouest.

Formation et compétences requises :
Concernant les aspects liés à la recherche, le/la candidat(e) devra être titulaire d’un Master avec des compétences en Machine Learning, intelligence artificielle et/ou gestion des données massives. Il/elle est aussi nécessaire qu’il/elle ait une expérience réussie dans le développement informatique des techniques cités précédemment, avec le langage Python par exemple.

Un bon niveau en mathématiques appliquées semble naturellement nécessaire, en particulier dans le domaine des probabilités, des statistiques et des processus stochastiques. Des notions d’optimisation, recherche opérationnelle, programmation linéaire et méthodes de décomposition serait un plus pour ce poste.
Une ouverture d’esprit suffisante pour s’intégrer dans une nouvelle équipe est demandée.

Adresse d’emploi :
laboratoire de recherche L@bISEN Yncréa Ouest – Nantes / Generix Group

Document attaché : 202202081021_Offre Thèse CIFRE 2022.pdf