title: What exactly does an "input" refer in the case of a neural network doing image detection (for example)?
body: <p><a href="https://i.stack.imgur.com/CWyPL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CWyPL.png" alt="a simple neural network" /></a></p>
  <p>Say, we have input in the form of a collection of images: -
  (200,56x56,3) where 200 is the number of distinct images, 56x56 are the pixels (length vs breadth) and 3 refer to RGB values</p>
  <p>So, x1,x2,x3,x4 etc refer to (number of instances, pixels (length), pixels (breadth) and RGB value?</p>
  <p>or are there 1,881,600 inputs (equal to 200x56x56x3)?</p>