Decision MetaMamba: Enhancing Selective SSM in Offline RL with Heterogeneous Sequence Mixing
This work addresses a key bottleneck in offline RL for improving model efficiency and performance, though it appears incremental as it modifies existing Mamba structures.
The paper tackles the problem of information loss in Mamba-based models for offline reinforcement learning (RL) due to selective mechanisms, proposing Decision MetaMamba (DMM) to enhance sequence mixing, which achieves state-of-the-art performance across diverse RL tasks with a compact parameter footprint.
Mamba-based models have drawn much attention in offline RL. However, their selective mechanism often detrimental when key steps in RL sequences are omitted. To address these issues, we propose a simple yet effective structure, called Decision MetaMamba (DMM), which replaces Mamba's token mixer with a dense layer-based sequence mixer and modifies positional structure to preserve local information. By performing sequence mixing that considers all channels simultaneously before Mamba, DMM prevents information loss due to selective scanning and residual gating. Extensive experiments demonstrate that our DMM delivers the state-of-the-art performance across diverse RL tasks. Furthermore, DMM achieves these results with a compact parameter footprint, demonstrating strong potential for real-world applications. Code is available at https://github.com/too-z/decision-metamamba