title: how to find similar images by using CNN model
body: <p>The requirement of my task is to find the similar output image with the input image in the CNN. There are about half millions images need to be handled with
  , it would not realistic to label each image. Beyond that, the images are candlestick charts about all stocks, so it is also very hard to classify all images. </p>
  
  <p>My basic idea is that  exporting the key features of images in CNN and comparing these features by using Hashing algorithm to get the similar one. But the idea was not compeleted, and how to done it in the python is also a big challenge. Therefor, is there anyone can help me with this issue,Thank you very much!!. If possible could you give me any relative articles or codes? </p>