Method matmul

ot/backend.py:3327–3328

(self, a, b)

        return tf.transpose(a, perm=axes)

    def matmul(self, a, b):
        return tnp.matmul(a, b)

    # todo(okachaiev): replace this with a more reasonable implementation
    def nan_to_num(self, x, copy=True, nan=0.0, posinf=None, neginf=None):