title: batch and subdivisions in YOLOv3
body: <p>I'm using YOLOv3 and YOLOv3-Tiny from <a href="https://github.com/AlexeyAB/darknet" rel="noreferrer">AlexeyAB's fork of Darknet</a>.  I understand that the image size must be a multiple of 32.  And that <code>batch</code> divided by <code>subdivisions</code> determines the number of images that will be processed in parallel.</p>
  
  <p>For example, the batch size in the default yolov3.cfg file is <code>64</code>, and subdivision is <code>16</code>, meaning 4 images will be loaded at once, and it will take 16 of these mini batches to complete one iteration.</p>
  
  <p>What I don't see documented <a href="https://github.com/AlexeyAB/darknet/wiki/CFG-Parameters-in-the-%5Bnet%5D-section" rel="noreferrer">in the wiki</a>:</p>
  
  <p><strong>Are there restrictions on these values?</strong>  Do they need to be a multiple of 16?  Power of 2?  Can I have <code>batch=25</code> and <code>subdivisions=5</code>?</p>