Type de contrat : CDD
Niveau de diplôme exigé : Thèse ou équivalent
Fonction : Post-Doctorant
A propos du centre ou de la direction fonctionnelle
The Inria Université Côte d’Azur center counts 36 research teams as well as 7 support departments. The center's staff (about 500 people including 320 Inria employees) is made up of scientists of different nationalities (250 foreigners of 50 nationalities), engineers, technicians and administrative staff. 1/3 of the staff are civil servants, the others are contractual agents. The majority of the center’s research teams are located in Sophia Antipolis and Nice in the Alpes-Maritimes. Four teams are based in Montpellier and two teams are hosted in Bologna in Italy and Athens. The Center is a founding member of Université Côte d'Azur and partner of the I-site MUSE supported by the University of Montpellier.
Contexte et atouts du poste
The AI Verse technology (http://www.ai-verse.com/) is devised to create infinitely random and semantically consistent 3D scenes. This creation is fast, consuming less than 4 seconds per labeled image. From these 3D scenes, the system is able to build quality synthetic images that come with rich labels that are unbiased unlike manually annotated labels.
As for real data, no metric exists to evaluate the performance of the synthetic datasets to train a neural network. We thus tend to favor the photorealism of the images but such a criterion is far from being the best. The current technology provides a means to control a rich list of additional parameters (quality of lighting, trajectory and intrinsic parameters of the virtual camera, selection and placement of assets, degrees of occlusion of the objects, choice of materials, etc). Since the generation engine can modify all of these parameters at will to generate many samples, we will explore optimization methods for improving the sampling quality.
The candidate will work with research experts in geometry, generative models and deep learning.
The research activites will be located at Inria and AI Verse, both in Sophia Antipolis (both sites are at a walking distance from each other). Some visits are also planned at Saclay in the LISN Laboratory (expertise in generative models and deep learning).
Mission confiée
Most likely, a set of samples generated randomly by the generative model does not cover well the whole space of interesting situations, because of unsuited sampling laws or of sampling realization issues in high dimensions. The main question is how to improve the quality of this generated dataset, that one would like to be close somehow to the given target dataset (consisting of examples of images that one would like to generate). For this, statistical analyses of these two datasets and of their differences are required, in order to spot possible issues such as strongly under-represented areas of the target domain. Then, sampling laws can be adjusted accordingly, possibly by optimizing their hyper-parameters, if any.
Principales activités
Technical goals or research tracks:
- visualization tools based on dimensionality reduction techniques (such as PCA, t-SNE, U-MAP...) can help figuring out possible mismatches between the two distributions (the one of generated samples vs. the target one)
- statistics or statistical tests on these distributions may help also expressing how different they are, and spotting areas of possible improvement
- joint statistical tests, such as proportion of nearest neighbors that fall in the same dataset vs. in the other one, gives also precious information
- to parameterize the sampling laws and optimizing the associated hyper-parameters. For this, a proper criterion ("loss" in machine learning terms) needs to be designed, e.g. based on the concepts above, to describe a metric between distributions, and a suitable optimization technique needs to be chosen and utilized.
Keywords: sampling, distributions, statistics, relatively high dimension, dimension reduction, optimization, visualization
Compétences
Required: knowledge in statistics, in particular sampling, distributions, high-dimensional issues
- data science skills are a plus
- numerical optimization skills are a plus
- machine learning skills are a plus, but not required
Avantages
- Subsidized meals
- Partial reimbursement of public transport costs
- Leave: 7 weeks of annual leave + 10 extra days off due to RTT (statutory reduction in working hours) + possibility of exceptional leave (sick children, moving home, etc.)
- Possibility of teleworking (after 6 months of employment) and flexible organization of working hours
- Professional equipment available (videoconferencing, loan of computer equipment, etc.)
- Social, cultural and sports events and activities
- Access to vocational training
- Social security coverage
Rémunération
Gross Salary: 2746 € per month
Partager
Informations générales
- Thème/Domaine :
Optimisation, apprentissage et méthodes statistiques
Statistiques (Big data) (BAP E) - Ville : Sophia Antipolis
- Centre Inria : Centre Inria d'Université Côte d'Azur
- Date de prise de fonction souhaitée : 2023-01-01
- Durée de contrat : 2 ans
- Date limite pour postuler : 2023-02-20
Contacts
- Equipe Inria : TITANE
-
Recruteur :
Alliez Pierre / Pierre.Alliez@inria.fr
L'essentiel pour réussir
We will explore optimization methods for improving the sampling quality of the scene generator
A propos d'Inria
Inria est l’institut national de recherche dédié aux sciences et technologies du numérique. Il emploie 2600 personnes. Ses 200 équipes-projets agiles, en général communes avec des partenaires académiques, impliquent plus de 3500 scientifiques pour relever les défis du numérique, souvent à l’interface d’autres disciplines. L’institut fait appel à de nombreux talents dans plus d’une quarantaine de métiers différents. 900 personnels d’appui à la recherche et à l’innovation contribuent à faire émerger et grandir des projets scientifiques ou entrepreneuriaux qui impactent le monde. Inria travaille avec de nombreuses entreprises et a accompagné la création de plus de 180 start-up. L'institut s'efforce ainsi de répondre aux enjeux de la transformation numérique de la science, de la société et de l'économie.
Consignes pour postuler
Sécurité défense :
Ce poste est susceptible d’être affecté dans une zone à régime restrictif (ZRR), telle que définie dans le décret n°2011-1425 relatif à la protection du potentiel scientifique et technique de la nation (PPST). L’autorisation d’accès à une zone est délivrée par le chef d’établissement, après avis ministériel favorable, tel que défini dans l’arrêté du 03 juillet 2012, relatif à la PPST. Un avis ministériel défavorable pour un poste affecté dans une ZRR aurait pour conséquence l’annulation du recrutement.
Politique de recrutement :
Dans le cadre de sa politique diversité, tous les postes Inria sont accessibles aux personnes en situation de handicap.
Attention: Les candidatures doivent être déposées en ligne sur le site Inria. Le traitement des candidatures adressées par d'autres canaux n'est pas garanti.