Added code to raise ValueError ifparent directory of path Saver.save(…

…) should use doesn't exist. This give user a much more readable error message than previous NotFoundError

Added code to raise ValueError ifparent directory of  path Saver.save() should use doesn't exist. This give user a much more readable error message than previous NotFoundError

Added some comments

Removed cached file

tensorflow/python/training/saver.py

@@ -1070,6 +1070,10 @@ def save(self, sess, save_path, global_step=None, latest_filename=None,
     if not isinstance(sess, session.SessionInterface):
       raise TypeError("'sess' must be a Session; %s" % sess)
 
+    # Note a few lines above save_path was set to os.path.dirname(save_path)
+    if not os.path.exists(save_path):
+      raise ValueError("Parent directory {} doesn't exist, can't save.".format(save_path))
+
     model_checkpoint_path = sess.run(
         self.saver_def.save_tensor_name,
         {self.saver_def.filename_tensor_name: checkpoint_file})