def render(self, indices=None, mode="human"):
    """Renders the environments with the given mode on the specified indices.

    Args:
      indices: array of indices, calls render on everything if indices is None.
      mode: rendering mode.

    Returns:
      a list of return values from the environments rendered.
    """

    if indices is None:
      indices = np.arange(self.batch_size)
    return self._render(indices, mode)
Renders the environments with the given mode on the specified indices.

    Args:
      indices: array of indices, calls render on everything if indices is None.
      mode: rendering mode.

    Returns:
      a list of return values from the environments rendered.
    
tensor2tensor/envs/env_problem.py