\(f^{-1}\) is continuous (images of open sets are open, i.e. \(f\) is an open map).
Cluster & Border Point Definition: The map is divided into clusters, and border points are identified using the Ford-Fulkerson based method.
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def to_dict(self) - Dict[str, Any]:
@ElijahLee：自从 Snapseed 的 iOS 版本进入 3.0 版本以来，一直积极保持更新，近期应用推出了 3.13、3.15 迭代与更新，新增 Snapseed 相机、复古胶片滤镜、锁屏小组件等功能。