Method sign

ot/backend.py:413–420

r"""Returns an element-wise indication of the sign of a number. This function follows the api from :any:`numpy.sign` See: https://numpy.org/doc/stable/reference/generated/numpy.sign.html

(self, a)

        raise NotImplementedError()

    def sign(self, a):
        r"""Returns an element-wise indication of the sign of a number.

        This function follows the api from :any:`numpy.sign`

        See: https://numpy.org/doc/stable/reference/generated/numpy.sign.html
        """
        raise NotImplementedError()

    def dot(self, a, b):
        r"""