espnet.transform.spec_augment.time_warp

source

espnet.transform.spec_augment.time_warp(x, max_time_warp=80, inplace=False, mode='PIL')

time warp for spec augment

move random center frame by the random width ~ uniform(-window, window) :param numpy.ndarray x: spectrogram (time, freq) :param int max_time_warp: maximum time frames to warp :param bool inplace: overwrite x with the result :param str mode: “PIL” (default, fast, not differentiable) or “sparse_image_warp”

(slow, differentiable)

• Returns numpy.ndarray: time warped spectrogram (time, freq)