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I didn't find repeat function in python API. I have a tensor A with shape of (1,3,512), and a tensor B with dynamic shape (-1,3,512), how to repeat copy tensor A on axis 0 to have same shape with ...

Numpy has a good function called numpy.repeat() that does exactly this, but returns an ndarray instead of a pandas series. Also numpy.zeros() for the very common case where we want a vector of zeros.