title: What is the exact meaning of stride's list in tf.nn.conv2d?
body: <pre><code>conv2d( input, filter, strides, padding, use_cudnn_on_gpu=None, data_format=None, name=None)
  strides=[b,h,w,c]
  </code></pre>
  
  <p>I know <code>b</code> means <code>batch</code>, <code>h</code> means <code>height</code>, <code>w</code> means <code>width</code> and <code>c</code> means <code>channel</code>. I see that <code>b</code> and <code>c</code> are always 1. What does it mean if <code>b = 2</code> or <code>c = 2</code>?</p>