title: generating image features dataset in scikit-learn - csv file
body: <p>I extract 2 edge features (Hog feature and sobel operator) from a single image.</p>
  
  <p>How can i create an image feature dataset in Scikit-learn python, like iris_dataset ? 
  In the library there are csv files which represent datasets. A csv file containing only numbers. How were generate these numbers? feature extraction?</p>
  
  <p>unfortunately i saw only a java tutorial here <a href="http://www.coccidia.icb.usp.br/coccimorph/tutorials/Tutorial-2-Creating-" rel="nofollow">http://www.coccidia.icb.usp.br/coccimorph/tutorials/Tutorial-2-Creating-</a>..., at 5 point talk about generating the training matrices (average and co-variance matrices)?
  There is any function in Scikit who generate these training arrays?</p>