descent on my energy function because I know the energy function is zero when all of these when the energy function is happy with the input so when all of these things agree basically the energy function is happy it will output zero otherwise it will output a high value therefore if I given any of those two any two of those three things I can find a compatible third thing by descending and then of course over here in these machine learning problems the task was always actually to learn an energy function right so usually in the