code: def download(datapath):
      opt = {"datapath": datapath}
  
      # download all relevant wizard of wikipedia models
      generator_download(datapath)
      retrieval_download(datapath)
  
      # now download knowledge retriever
      fnames = ["knowledge_retriever.tgz"]
      opt["model_type"] = "knowledge_retriever"
      download_models(
          opt, fnames, "wizard_of_wikipedia", version="v3.0"
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: download(datapath) without return types