Loads the list of annotations from the given file and **appends** it to the current list.

    ``list_file`` : str
      The name of a list file to load and append

def load(self, list_file):
    """Loads the list of annotations from the given file and **appends** it to the current list.

    ``list_file`` : str
      The name of a list file to load and append
    """
    with open(list_file) as f:
      for line in f:
        if line and line[0] != '#':
          splits = line.split()
          bounding_boxes = []
          for i in range(1, len(splits), 4):
            assert splits[i][0] == '[' and splits[i+3][-1] == ']'
            bounding_boxes.append(BoundingBox(topleft=(float(splits[i][1:]), float(splits[i+1])), size=(float(splits[i+2]), float(splits[i+3][:-1]))))
          self.image_paths.append(splits[0])
          self.bounding_boxes.append(bounding_boxes)