title: How do I list all files in a directory for a directory name stored in a tensor?
body: <p>I have a placeholder which will be fed by a string value. The string value represents a path to some directory name. In that directory there are different ".jpg" files. How can I ask TensorFlow to list all of those files?
  In other words, I want to add a node to my computation graph which will result in listing the directory, if I run it through my session. Is there a way to do that?</p>