CatchCore: Catching hierarchical dense subtensor

CatchCore is a novel framework to detect hierarchical dense cores in multi-aspect data (i.e. tensors).

CatchCore has the following properties:

• unified metric: provides a gradient-based optimized framework as well as theoretical guarantees
• accurate: provides high accuracy in both synthetic and real data
• effectiveness: spots anomaly patterns and hierarchical dense community
• scalable: scales almost linearly with all factors of input tensor, also has linearly space complexity