We study the generalization capability of Unsupervised Learning in solving the Travelling Salesman Problem (TSP). We use a Graph Neural Network (GNN) trained with a surrogate loss function to generate an embedding for each node. We use these embeddings to construct a heat map that indicates the likelihood of each edge being part of the optimal route. We then apply local search to generate our final predictions. Our investigation explores how different training instance sizes, embedding dimensions, and distributions influence the outcomes of Unsupervised Learning methods. Our results show that training with larger instance sizes and increasing embedding dimensions can build a more effective representation, enhancing the model's ability to solve TSP. Furthermore, in evaluating generalization across different distributions, we first determine the hardness of various distributions and explore how different hardnesses affect the final results. Our findings suggest that models trained on harder instances exhibit better generalization capabilities, highlighting the importance of selecting appropriate training instances in solving TSP using Unsupervised Learning.

探讨无监督学习在解决旅行推销员问题中的泛化能力，通过训练图神经网络并使用嵌入来构建边缘的热图，同时研究不同的训练实例大小、嵌入维度和分布对无监督学习方法结果的影响，结果表明使用较大的实例规模和增加嵌入维度可以构建更有效的表示，提高解决旅行推销员问题的能力，并发现在不同分布上进行泛化评估时，选择更困难的实例作为训练数据可以使模型具备更好的泛化能力。

无监督学习中旅行商问题的规模和难度泛化