  Sound event detection with weakly labeled data is considered as a problem of
multi-instance learning. And the choice of pooling function is the key to
solving this problem. In this paper, we proposed a hierarchical pooling
structure to improve the performance of weakly labeled sound event detection
system. Proposed pooling structure has made remarkable improvements on three
types of pooling function without adding any parameters. Moreover, our system
has achieved competitive performance on Task 4 of Detection and Classification
of Acoustic Scenes and Events (DCASE) 2017 Challenge using hierarchical pooling
structure.
