Towards Instance-adaptive Inference for Federated Learning

TL;DR

This paper introduces FedIns, a federated learning algorithm that adaptively adjusts inference for each instance to handle intra-client data heterogeneity, improving performance with low communication overhead.

Contribution

FedIns employs a parameter-efficient fine-tuning method with dynamic instance-specific adaptation, addressing intra-client heterogeneity in federated learning.

Findings

Outperforms state-of-the-art FL algorithms by 6.64% on Tiny-ImageNet.

Achieves less than 15% communication cost.

Effectively reduces intra- and inter-client heterogeneity.

Abstract

Federated learning (FL) is a distributed learning paradigm that enables multiple clients to learn a powerful global model by aggregating local training. However, the performance of the global model is often hampered by non-i.i.d. distribution among the clients, requiring extensive efforts to mitigate inter-client data heterogeneity. Going beyond inter-client data heterogeneity, we note that intra-client heterogeneity can also be observed on complex real-world data and seriously deteriorate FL performance. In this paper, we present a novel FL algorithm, i.e., FedIns, to handle intra-client data heterogeneity by enabling instance-adaptive inference in the FL framework. Instead of huge instance-adaptive models, we resort to a parameter-efficient fine-tuning method, i.e., scale and shift deep features (SSF), upon a pre-trained model. Specifically, we first train an SSF pool for each client, and aggregate these SSF pools on the server side, thus still maintaining a low communication cost. To enable instance-adaptive inference, for a given instance, we dynamically find the best-matched SSF subsets from the pool and aggregate them to generate an adaptive SSF specified for the instance, thereby reducing the intra-client as well as the inter-client heterogeneity. Extensive experiments show that our FedIns outperforms state-of-the-art FL algorithms, e.g., a 6.64\% improvement against the top-performing method with less than 15\% communication cost on Tiny-ImageNet. Our code and models will be publicly released.