  Recent progress in aspect-level sentiment classification has been propelled
by the incorporation of graph neural networks (GNNs) leveraging syntactic
structures, particularly dependency trees. Nevertheless, the performance of
these models is often hampered by the innate inaccuracies of parsing
algorithms. To mitigate this challenge, we introduce SynthFusion, an innovative
graph ensemble method that amalgamates predictions from multiple parsers. This
strategy blends diverse dependency relations prior to the application of GNNs,
enhancing robustness against parsing errors while avoiding extra computational
burdens. SynthFusion circumvents the pitfalls of overparameterization and
diminishes the risk of overfitting, prevalent in models with stacked GNN
layers, by optimizing graph connectivity. Our empirical evaluations on the
SemEval14 and Twitter14 datasets affirm that SynthFusion not only outshines
models reliant on single dependency trees but also eclipses alternative
ensemble techniques, achieving this without an escalation in model complexity.
