Deep Learning Methods for Underwater Target Feature Extraction and Recognition

Table 3

Comparison of different pooling methods.

Frame size	Pooling method	Number of ELM hidden layer nodes	Recognition rate (%)
2176	Maximum value	40	92.88
2176	Mean value	40	90.80
2176	Maximum value-mean value	40	93.04
2176	Mean value-maximum value	40	91.65