Cross-correlate two N-dimensional arrays.
Cross-correlate in1 and in2, with the output size determined by the mode argument.
Parameters: | in1 : array_like
in2 : array_like
mode : str {‘full’, ‘valid’, ‘same’}, optional
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Returns: | correlate : array
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Notes
The correlation z of two d-dimensional arrays x and y is defined as:
- z[...,k,...] = sum[..., i_l, ...]
- x[..., i_l,...] * conj(y[..., i_l + k,...])