Fix checkpoint reloading

      # self._save_path is "logdir/model.ckpt"

      if os.path.basename(self._save_path) in filename:

        try:

          N = int(filename.split("-")[-1])

          N = int(filename.split("-")[1].split(".")[0])

          if N > highest_num:

            highest_num = N

            last_checkpoint = filename

            last_checkpoint = "model.ckpt-"+str(N)

        except ValueError:

          pass

    return os.path.join(self.logdir, last_checkpoint)