STAGE Representation and contrastive learning on graphs

Date de mise à jour de l’offre

ECOLE NORMALE SUPERIEURE PARIS-SACLAY :

Centre Borelli et une structure de recherche de l'ENS Paris-Saclay. Plus d'info : https://ens-paris-saclay.fr/recherche/laboratoires-et-instituts/centre-borelli

Description de la mission

In the literature, numerous graph neural network (GNN) models have been proposed for graph-related tasks, such as node classification, link prediction, and graph classification. Most existing GNN approaches use semi-supervised training. For many real-world graph applications, e.g. protein analysis, they intuitively require the input of some amount of labeled data.
Alternatively, there is a series of random walk-based GNNs, including node2vec and graph2vec,
which are unsupervised. Their approach is to first learn the node embeddings, and then various supervised downstream tasks are directly applied on these node embeddings. These approaches can be considered as part of the contrastive learning framework.

Contrastive learning originally aims to learn to embed each image in a self-supervised manner. Due to its impressive performance in many tasks, contrastive learning has become the hottest topic in unsupervised learning. Its motivation is to maximize the similarity of positive pairs and the distance of negative pairs. Generally speaking, the positive pairs are composed of data augmentations of the same instance, while those of different instances are regarded as negative pairs.

This internship aims to investigate the last findings in graph embedding and graph contrastive learning, understand, deconstruct the different steps, and make some steps towards new contrastive learning approaches for graphs.

Profil recherché

Applied Maths or Informatics. This is an internship for a student to finalize his/her M2 program. Possibility to continue in a PhD thesis .

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    ECOLE NORMALE SUPERIEURE PARIS-SACLAY
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Site internet de la structure
    http://www.centreborelli.fr
  • Type de stage ou contrat
    Contrat d'apprentissage
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 4 mois et jusqu'à 6 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    4 Avenue des Sciences 91190 2e étage Bâtiment Nord
    91190 GIF SUR YVETTE
  • Accès et transports
    RERB et bus