code: def get_valid_actions(self):
      # This grammar produces true/false statements like
      # (object_exists all_objects)
      # (object_exists (black all_objects))
      # (object_exists (triangle all_objects))
      # (object_exists (touch_wall all_objects))
      # (object_exists (triangle (black all_objects)))
      # ...
      actions = {
          "@start@": ["@start@ -> t"],
          "t": ["t -> [<o,t>, o]"],
          "<o,t>": ["<o,t> -> object_exists"],
          "o": ["o -> [<o,o>, o]", "o -> all_objects"],
          "<o,o>": [
              "<o,o> -> black",
              "<o,o> -> triangle",
              "<o,o> -> touch_wall",
          ],
      }
      return actions
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/semparse/action_space_walker_test.py
imports: from __future__ import absolute_import
  from nltk.sem.logic import TRUTH_TYPE
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.semparse.worlds.world import World
  from allennlp.semparse import ActionSpaceWalker
label_desc: Use image node_id 2 for calling the FakeWorldWithAssertions obj's underlying member method code with example usage: obj.get_valid_actions() and returns: actions