GraphSplat: Sparse-View Generalizable 3D Gaussian Splatting is Worth Graph of Nodes

Generalizable 3D Gaussian Splatting (G-3DGS) has recently emerged as a promising solution for efficient 3D scene representation and novel view synthesis. However, sparse-view scenarios pose a critical challenge for accurate depth estimation. In such cases, viewpoint overlaps are minimal, and many regions are visible from only a single view. As a result, reliable multi-view matching is unavailable in these areas, leading to significant reconstruction quality degradation. To tackle this bottleneck, we propose GraphSplat, a feed-forward framework for novel view synthesis that dynamically incorporates both cross-view and monocular cues through a graph-based feature aggregation strategy. Central to our approach is a Multi-view Aggregate Graph Attention (MAGA) mechanism, which adaptively reweights intra-view and inter-view node connections to compensate for unreliable multi-view correspondences with robust single-view depth priors. In addition, we design a Hierarchical Depth Fusion Estimator (HDFE) module to integrate monocular and multi-view depth cues, effectively reducing ghosting artifacts and improving geometric consistency. Extensive evaluations on RealEstate10K and ACID benchmarks show that GraphSplat achieves competitive performance against prior SOTA methods, with improvements in appearance fidelity and cross-dataset generalization particularly under challenging sparse-view conditions.