isomorphism problem的用法和样例：
例句
- Determining whether two graphs are isomorphic is referred to as the graph isomorphism problem.
确定是否是同构的两个图形称为图同构问题。 - The algorithm transforms the subgraph isomorphism problem into a matching problem between vertexes through the introduction of similarity features for every vertex.
通过单个顶点的相似度特征，将子图同构问题转化为顶点之间的匹配问题。
