public void Backward(float label)
{
a.gradient = 0.0f;
b.gradient = 0.0f;
c.gradient = 0.0f;
var pull = 0.0f;
if (label == 1.0f && unit_out.value < 1.0f)
{
pull = 1.0f;
}
if (label == -1.0f && unit_out.value > -1.0f)
{
pull = -1.0f;
}
circuit.Backward(pull);
a.gradient += -a.value;
b.gradient += -b.value;
}