Oregon State University

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Event Details

PhD Final Oral Examination – Forrest Briggs

Monday, November 25, 2013 2:00 PM - 4:00 PM

Multi-Instance Multi-Label Learning: Algorithms and Applications to Bird Bioacoustics
We consider the problem of supervised classification of bird species from audio recordings in a real-world acoustic monitoring scenario (i.e. audio data is collected in the field with an omnidirectional microphone, without human supervision). Obtaining better data about bird activity can assist conservation efforts and reflects on other organisms. However, traditional methods are labor-intensive. Most prior work on machine learning for bird song is not applicable to real-world acoustic monitoring, because it assumes recordings contain only a single species of bird, while recordings typically contain multiple simultaneously vocalizing birds. We propose to use the multi-instance multi-label (MIML) framework in machine learning for the species classification problem, where the dataset is viewed as a collection of bags of instances paired with sets of labels. Furthermore, we formalize MIML instance annotation, where the goal is to predict instance labels while learning only from bag label sets. We develop the first MIML representation for audio, and several new algorithms for MIML instance annotation based on SVMs and classifier chains. The proposed methods classify either the set of species present in a recording, or individual calls, while learning only from recordings paired with a set of species. This form of training data requires less human effort to obtain than individually labeled calls. These methods are successfully applied to audio collected in the field which included multiple simultaneously vocalizing species. The proposed algorithms for MIML classification are general, and are also applied to object recognition in images.

Co-Major Advisor: Xiaoli Fern
Co-Major Advisor: Raviv Raich
Committee: Weng-Keen Wong
Committee: Matthew Betts
GCR: Robert Higdon 

Kelley Engineering Center (campus map)
1126 (Board Room)
Nicole Thompson
1 541 737 3617
Nicole.Thompson at oregonstate.edu
Sch Elect Engr/Comp Sci
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