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scipy.sparse.dok_matrix.

# conj

dok_matrix.conj(copy=True)

  Element-wise complex conjugation.

  If the array/matrix is of non-complex data type and `copy` is False, this method does nothing and the data is not copied.

  Parameters:
    copy bool, optional

      If True, the result is guaranteed to not share data with self.

  Returns:
    A The element-wise complex conjugate.