"Machine learning iteration is conceptually related to but not the same as other concepts in computer programming of iteration. The general meaning of iteration in image related programming is applying a function to every element of something. To iterate over an image is to apply a given function to every pixel or voxel value. Many simple functions such as windowing that radiologists execute are accomplished through functions that iterate over all the values in an image. In contrast to the meaning of iteration in image processing, Iteration in the context of machine learning refers to many processes involved in training the computer program."