Depends if you can calculate the gradient and whether it it's known and defined. So, this all depends on the function in question. And also, the words "perfect

Depends if you can calculate the gradient and whether it it's known and defined. So, this all depends on the function in question. And also, the words "perfect accuracy" begs a definition here. How many decimals are we talking about here, or are we talking of all the "optimal solutions" or just one optimal solution, etc.