Privacy on-demand and Security preserving Federated Generative Networks or Models
il y a 3 semaines
Contexte et atouts du poste
Teams and supervision
• INRIA : COATI (Frédéric Giroire, Chuan Xu), EPIONE (Marco Lorenzi)
• NOKIA: Bell Labs Core Research
Mission confiée
Future sixth-generation (6G) networks will be highly heterogeneous, with the massive development of mobile edge computing inside networks. Furthermore, 6G is expected to support dynamic network environments and provide diversified intelligent services with stringent Quality of Service (QoS) re- quirements. Various new intelligent applications and services will emerge (including augmented reality (AR), wireless machine interaction, smart city, etc) and will enable tactile communications and In- ternet of everything (IoE). This will challenge wireless networks in the dimensions of delay, energy consumption, interaction, reliability, and degree of intelligence and knowledge, but also in the dimen- sion of information and data sharing. In turn, 6G networks will be expected about leveraging data at the next step of the new communication system generation. First of all, they will generate large amounts of data much more data than 5G networks: multiple sources as Core, Radio Access Network, OAM, User Equipments (UEs) but also as private and/or personal devices/machines massively con- nected, data-generator applications as sensing, localization, context-awareness services etc. Besides, unlike today’s networks where traffic is almost entirely centralized, most 6G traffic will remain localized and highly distributed. The communication system will not only provide the bits reliably, but more importantly will provide the intelligent data processing through connectivity and resources computing in the devices, the edge, and the cloud in the network. For this, with Artificial Intelligence (AI) and Machine Learning (ML), machines will bring to networks the necessary intelligence very close to the place of action and decision-making and will also make data sharing possible.
Reliable and efficient transmission, data privacy and security are great challenges in data sharing. Specially for 5G advanced and 6G networks data is distributed with the wide deployment of various connected Internet of Thing (IoT) devices, and are generated from many distributed network nodes, e.g., end users, small Base Stations or Distributed Units and the network edge. Also, how to col- lect/share efficiently data from multiple sources (e.g., sensors or device) up to AI/ML-based Network applications/services of Orchestration and Automation Layer (network management system) in Edge? The models shall be trained, updated regularly and operate in real-time.
Recently, generative models have been demonstrated playing a key role in data sharing while pre- serving privacy and security. They are able to generate synthetic data which distribution is similar to the original data one. So, instead of sending original data, many applications (medical or financial) use them to transfer data. Generative models are shown be useful in many scenarios such as health and financial applications [VSV+22]. However, the highly distributed architecture in 5G advanced/6G motivates the need for distributed, multi-agent learning for building generative models located at given anchor points of data collection (Edge server or Central Units) inside the RAN/Edge.
Challenges and objectives
We aim to design a communication-efficient and privacy-preserving on demand framework such that the local agents inside RAN/Edge cooperatively generate a synthetic dataset which represents well the global data distribution for model utility. To this end, one can train a generative adversarial network in a federated way [AMR+20], where the agents and the server alternatively minimize the loss function of the discriminator and the generator. However, deep generative models have a tendency to memorize the training examples which may leak private information [HMDC19, CYZF20]. While, applying the traditional privacy-preserving defense such as differential privacy mechanism [Dwo06] will degrade the generative model’s utility and thus influences the synthetic data quality. Moreover, the training requires 500-10000 communication rounds in practice for convergence (see [KMA+21, Table 2]) which is expensive for communication cost. Recently, there is another work [ZCL+22] where the server makes uses of all the local trained models to train a generator, which minimizes the communication cost to only one round. However, transferring these local models are extremely dangerous as they can be used to infer the private information on the dataset of devices [FJR15, YGFJ18]. Alternatively, instead of transferring the models as the previous work proposed, the devices can transfer directly the distilled synthetic data which are computed locally [ZPM+20]. However, the quality of the assembled synthetic dataset degrades especially when some agents have just few training samples.
We will first compare the above-mentioned existing methods for synthetic dataset generation, in terms of their trade-offs on model accuracy, data similarity, communication cost, model compression and privacy. Then, to expose their privacy vulnerability, we will design computational-efficient attacks, for both passive and active adversary cases. Finally, we will design a framework with better trade-off for the task.
The project is part of a larger collaborative project with Nokia Bell labs (Défi LearnNet). A PhD grant is funded as part of the global project as well as this internship. This internship can thus be followed by a PhD for a motivated student.
Principales activités
Research
Compétences
The candidate should have a solid mathematical background, good programming skills and previous experience with PyTorch or TensorFlow. He/She should also be knowledgeable on machine learning, especially generative neural networks, and have good analytical skills. We expect the candidate to be fluent in English.
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-
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