title: Multiclassification task using keras
body: <p>Classification (not detection!) of several objects in one image is the problem. How can I do this using keras.</p>
  <p>For example if I have 6 classes (dogs,cats,birds,...) and two different objects (a cat and a bird) in this image. The label would be of the form: [0,1,1,0,0,0] Which metric, loss function and optimizer is recommended? I would like to use CNN.</p>