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Path of Exile is an online Action RPG set in the dark fantasy world of Wraeclast. It is designed around a strong online item economy, deep character customisation, competitive PvP and ladder races. The game is free.

Gradient descent is a first-order iterative optimization algorithm for finding a local minimum of a differentiable function. The idea is to take repeated steps in the opposite direction of the gradient (or approximate gradient) of the function at the current point, because this is the direction of steepest descent. Conversely, stepping in the direction of the gradient will lead to a local maximum of that function; the procedure is then known as gradient ascent.