Memory-Efficient Federated Adversarial Training with Theoretic Robustness and Low Inconsistency

Kernekoncepter

FedProphet, a novel federated adversarial training framework, can achieve memory efficiency, adversarial robustness, and objective consistency simultaneously by partitioning the large model into small cascaded modules, deriving strong convexity regularization to guarantee robustness, and coordinating the local training of clients based on their hardware resources.

Resumé

The paper proposes FedProphet, a memory-efficient federated adversarial training framework that can achieve strong robustness and low objective inconsistency simultaneously.
Key highlights:

FedProphet partitions the large global model into small cascaded modules so that memory-constrained clients can train a module without memory swapping.
On the client side, FedProphet conducts adversarial cascade learning with strong convexity regularization to theoretically guarantee the robustness of the whole model. It also shows that the strong robustness implies low objective inconsistency.
On the server side, FedProphet develops Adaptive Perturbation Adjustment to balance the utility and robustness, and Differentiated Module Assignment to further reduce the objective inconsistency by allowing "prophet" clients to train more modules.
FedProphet empirically shows significant improvement in both accuracy and robustness compared to previous memory-efficient methods, achieving almost the same performance as end-to-end federated adversarial training while saving 80% memory and achieving up to 10.8x speedup.

Statistik

"FedProphet shows a significant improvement in both accuracy and robustness compared to previous memory-efficient methods, achieving almost the same performance of end-to-end FAT with 80% memory reduction and up to 10.8× speedup in training time."

Citater

"FedProphet, a novel federated adversarial training framework, can achieve memory efficiency, adversarial robustness, and objective consistency simultaneously by partitioning the large model into small cascaded modules, deriving strong convexity regularization to guarantee robustness, and coordinating the local training of clients based on their hardware resources."
"The strong robustness achieved by our method also implies low objective inconsistency in cascade learning."

Vigtigste indsigter udtrukket fra

FedProphet: Memory-Efficient Federated Adversarial Training via Theoretic-Robustness and Low-Inconsistency Cascade Learning

by Minxue Tang,... kl. arxiv.org 09-16-2024

https://arxiv.org/pdf/2409.08372.pdf

Dybere Forespørgsler

How can FedProphet's techniques be extended to other distributed learning settings beyond federated learning?

FedProphet's techniques can be adapted to various distributed learning settings, such as distributed data parallelism and multi-task learning, by leveraging its core principles of memory efficiency, adversarial robustness, and objective consistency. In distributed data parallelism, where multiple nodes train the same model on different data subsets, the concept of partitioning a large model into smaller modules can be employed to ensure that each node operates within its memory constraints. This modular approach allows for efficient training without the need for extensive memory swapping, thus reducing latency and improving convergence times.
In multi-task learning, where different tasks may require different model architectures, FedProphet's differentiated module assignment strategy can be utilized to allocate resources dynamically based on the specific requirements of each task. By assessing the available computational resources and the complexity of each task, the server can assign appropriate modules to clients, ensuring that resource utilization is maximized while maintaining high performance across tasks.
Moreover, the strong convexity regularization technique can be beneficial in any distributed learning scenario where robustness against adversarial examples is critical. By ensuring that each module maintains a level of robustness, the overall system can achieve better generalization and performance, even in the presence of adversarial perturbations.

What are the potential limitations or drawbacks of the strong convexity regularization approach used in FedProphet?

While strong convexity regularization offers several advantages, such as ensuring robustness and reducing objective inconsistency, it also presents potential limitations. One significant drawback is the increased computational overhead associated with enforcing strong convexity. The requirement for additional regularization terms can lead to longer training times, particularly in resource-constrained environments where computational efficiency is paramount.
Furthermore, the choice of the strong convexity hyperparameter (μ) is critical. If set too high, it may overly constrain the model, leading to underfitting and poor performance on complex tasks. Conversely, if set too low, the desired robustness may not be achieved, leaving the model vulnerable to adversarial attacks. This delicate balance necessitates careful tuning and may complicate the training process.
Additionally, the reliance on strong convexity may limit the applicability of FedProphet to certain types of models or architectures that do not naturally exhibit strong convexity properties. This could restrict the framework's versatility in handling a wide range of machine learning tasks, particularly those involving non-convex loss functions or complex neural network architectures.

How can the module assignment strategy in FedProphet be further improved to better utilize the heterogeneous resources of clients?

The module assignment strategy in FedProphet can be enhanced by incorporating more sophisticated resource estimation and prediction algorithms. By utilizing machine learning techniques, such as reinforcement learning or optimization algorithms, the server can dynamically adjust module assignments based on real-time assessments of client performance and resource availability. This adaptive approach would allow for more granular control over module assignments, ensuring that clients with higher computational capabilities are utilized more effectively.
Additionally, implementing a feedback mechanism where clients report their training performance and resource utilization metrics can provide valuable insights for the server. This data can be used to refine the module assignment strategy, allowing the server to make informed decisions about which clients are best suited for specific modules based on historical performance and current resource availability.
Moreover, integrating a priority system for module assignments could further optimize resource utilization. Clients could be categorized based on their capabilities, and more complex modules could be assigned to higher-capacity clients, while simpler modules could be allocated to those with limited resources. This hierarchical approach would ensure that all clients are engaged in the training process while maximizing the overall efficiency of the federated learning system.
Lastly, exploring collaborative training strategies, where clients can share intermediate results or collaborate on training specific modules, could enhance the overall performance and robustness of the system. By allowing clients to work together, the framework can leverage the strengths of each client, leading to improved convergence and model accuracy.