Python VisibleDeprecationWarning: converting an array with ndim > 0 to an index will result in an error in the future

问题原因：nd.array值直接用做数组索引，索引一般需为整数，可能带来风险，比如浮点数作为索引

解决方案：把nd.array值强制转成int 

peakIdx = int( np.asarray(peakIdx[0]) )