def grad_undefined(op, x_pos, x, comment=""):

    return (NullType(
        (
            "This variable is Null because the grad method for "
            "input %s (%s) of the %s op is mathematically undefined. %s"
        ) % (x_pos, x, op, comment)))()
Encodes a number of secret attributes to be issued.
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/gradient.py/grad_undefined--crossover with--dataset/ETHPy150Open gdanezis/petlib/examples/amacscreds.py/cred_secret_issue_user