code: def iex_document_sampler_creator(env_ctx):
      return iex.IETopicDocumentSampler(seed=env_ctx["seed"])
  
file_path: ray/python/ray/rllib/examples/env/recommender_system_envs_with_recsim.py
imports: from recsim import choice_model
  from recsim.environments import long_term_satisfaction, interest_evolution, interest_exploration
  from ray.rllib.env.wrappers.recsim import make_recsim_env
  from ray.tune import register_env
label_desc: Use image node_id 4 for calling a global function with example usage: iex_document_sampler_creator(env_ctx) and returns: iex