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MoSA: Mixture of Sparse Adapters for Visual Efficient Tuning


Core Concepts
Proposing MoSA as a novel Adapter Tuning method to fully unleash the potential of standard adapters, achieving efficiency and performance simultaneously.
Abstract
Introduces MoSA as a novel Adapter Tuning method. Explains the motivation behind developing MoSA. Describes the methodology of MoSA in detail, including sparse training and hierarchical strategies. Provides results from experiments showcasing the superior performance of MoSA over other baselines. Discusses ablation studies to validate the effectiveness of different components in MoSA.
Stats
Recent efforts have either focused on training multiple adapter experts to increase model capacity or on pruning adapters to achieve parameter efficiency. Extensive experiments on 27 visual tasks demonstrate that MoSA consistently outperforms other Adapter Tuning methods by a large margin.
Quotes
"With the rapid growth in the scale of pre-trained foundation models, parameter-efficient fine-tuning techniques have gained significant attention." "MoSA can achieve significantly better performance than standard adapters without any additional computational or storage overhead."

Key Insights Distilled From

by Qizhe Zhang,... at arxiv.org 03-26-2024

https://arxiv.org/pdf/2312.02923.pdf
MoSA

Deeper Inquiries

How does MoSA address the issue of parameter redundancy in standard adapters

MoSA addresses the issue of parameter redundancy in standard adapters by splitting the standard adapter into multiple sparse adapters. This approach allows for the full utilization of all parameters within the adapter, maximizing efficiency and performance. By introducing multiple non-overlapping modules and stochastically activating them during training, MoSA ensures that each parameter in the adapter is fully leveraged without introducing additional computational or storage overhead. Through this design, MoSA can achieve significantly better performance than standard adapters without any extra parameters.

What are the implications of introducing a hierarchical sparse strategy in Adapter Tuning

The introduction of a hierarchical sparse strategy in Adapter Tuning has significant implications for enhancing model capacity and performance. By keeping the down-projection layer as a dense matrix while sparsely splitting the up-projection layer, this strategy provides robust intermediate features through dense processing while increasing model capacity with multiple sparse projections. This hierarchical approach ensures efficient data utilization and prevents data dilution issues commonly associated with sparse training methods. Overall, it enhances adaptability to different downstream tasks and improves overall model performance.

How might sparse training impact model performance when training data is limited

Sparse training may impact model performance when training data is limited by reducing data dilution issues typically seen with traditional stochastic activation mechanisms in Mixture-of-Experts (MoE) systems. When there is insufficient data for downstream tasks, sparse training helps maintain effective parameter utilization by focusing on specific experts rather than spreading resources thinly across all parameters. This targeted approach can lead to improved generalization capabilities and enhanced task-specific learning even with limited training samples available.
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