At this moment relu_layer op doesn't allow threshold configuration, and legacy RELU op allows that.
We should add configuration option to relu_layer.

Add quickselect algorithm. Quickselect is a selection algorithm to find the kth smallest element in an unordered list.

Hi,

As it been considered to support alternative normalized device coordinates for Orthographic3 and Perspective3 ?
Currently both follow the OpenGL convention so are not usable in other situations (Vulkan for instance).

I am willing to work on it if it is desired to have that in nalgebra.

I can think of two approaches:

• have separate structures in separate pathes within the crate
• u