Description: The zero-crossing rate refers to the frequency at which a signal changes from a positive value to a negative one or vice versa. This concept is fundamental in signal processing, especially in the fields of audio and electronics. Technically, it can be defined as the number of times the signal crosses the horizontal axis (zero) within a given time interval. This metric is crucial for analyzing the waveform of a signal, as it provides information about its frequency and amplitude. In the context of machine learning, the zero-crossing rate can be used as a feature for various types of models, as a signal with a high number of zero crossings may indicate greater complexity or variability in the data. Additionally, in hyperparameter optimization, this rate can be an indicator of the stability and performance of a model, helping researchers adjust parameters to improve accuracy and generalization.
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