[D] Simple Questions Thread

<!-- SC_OFF --><div class="md"><p>Please post your questions here instead of creating a new thread. Encourage others who create new posts for questions to post here instead!</p> <p>Thread will stay alive until next one so keep posting after the date in the title.</p> <p>Thanks to everyone for answering questions in the previous thread!</p> </div><!-- SC_ON --> &#32; submitted by &#32; <a href="https://www.reddit.com/user/AutoModerator"> /u/AutoModerator </a> <br/> <span><a href="https://www.reddit.com/r/MachineLearning/comments/1s9n1jr/d_simple_questions_thread/">[link]</a></span> &#32; <span><a href="https://www.reddit.com/r/MachineLearning/comments/1s9n1jr/d_simple_questions_thread/">[comments]</a></span>