code: public java.util.Map<java.lang.String, java.lang.String> getRetMap() {
      return internalGetRet().getMap();
    }
docs: <pre>
  A mapping from the output arg names from `signature` to the
  outputs from `node_def` that should be returned by the function.
  </pre>
  
  <code>map&lt;string, string&gt; ret = 4;</code>