class_docstr: Save collection of render frames.
docstr: Returns the collection render_mode name.
docstr_tok: ["Returns","the","collection","render_mode","name","."]
code: def render_mode(self):
      """Returns the collection render_mode name."""
      return f"{self.env.render_mode}_list"
  
imports: import gym
label_desc: Use image node_id 2 for calling the RenderCollection obj's underlying member method code with example usage: obj.render_mode() and returns: self, str