title: How can I get the distance in sklearn.neighbors function
body: <p>I have some pictures to recognize, one of them is correct. I try to compare them with my correct dataset by scikit-learn knn function.</p>
  <p>I think the distance between correct picture and correct dataset should be nearest.</p>
  <p>I can get the correct picture by compare the distance of each picture I need to recognize.</p>
  <p>My question is how I can get the distance by scikit-learn knn.</p>