title: How is caffe input_shape actually work?
body: <p>I'm confused about the followinng block in a caffe implemented prj of obj detection with Faster-RCNN in the begining of test.prototxt:</p>
  
  <pre><code>input: "data"
  input_shape {
    dim: 1
    dim: 3
    dim: 224
    dim: 224
  }
  
  input: "im_info"
  input_shape {
    dim: 1
    dim: 3
  }
  </code></pre>
  
  <p>but actually the input is not the specified size of 224*224, and does not need to be 224*224, I see in the test code, images are just read with out resize and then pass through the network, very confused, and did not find reference of how caffe define these blocks, can someone help? </p>