Automated classification of dolphin echolocation click types from the Gulf of Mexico
Fig 2
Effect of edge pruning threshold (pe).
The effects of pe choice on Phase 1 clusters (subplots A-C) were evaluated on a subset of bins from site MC. Effects on Phase 2 clusters (subplots D-F) were evaluated by running 20 iterations of the CW routine at each threshold. Horizontal bars represent the normalized distributions of each measured parameter, with the gray + indicating the parameter mean. In both phases, increasing pe increased the mean number of clusters identified and the mean percentage of nodes. Measures of cluster purity (Phase 1: within-cluster similarity, Phase 2: NMI) also generally increased, with the exception of pe = 0.70 (NMI = 1 with a single cluster across all partitions and no isolation). A mid-range threshold of pe = 0.95 was selected for both phases to allow identification of multiple clusters without over-pruning or over-training.