title: Faster RCNN training get stuck in iteration 660
body: <p>I met one problem where I trained py-faster-rcnn on my own dataset, but it get stuck in iteration 660 for a long time and no response. Has anyone met this problem before? How to solve it? Thanks a lot!</p>
  
  <p>FYR:</p>
  
  <blockquote>
  <pre><code>I0404 17:50:23.514286 25601 solver.cpp:571] Iteration 640, lr = 0.001
  I0404 17:50:24.876749 25601 solver.cpp:242] Iteration 660, loss = 0.341694
  I0404 17:50:24.876804 25601 solver.cpp:258] Train net output #0: rpn_cls_loss = 0.296529 (* 1 = 0.296529 loss)
  I0404 17:50:24.876819 25601 solver.cpp:258] Train net output #1: rpn_loss_bbox = 0.0451643 (* 1 = 0.0451643 loss)
  I0404 17:50:24.876835 25601 solver.cpp:571] Iteration 660, lr = 0.001
  </code></pre>
  </blockquote>