code: def _param_string(parameters: Dict) -> str:
      """Hacky helper for nice-visualizatioon"""
      substr = f"[{parameters._get_parameters_str()}]"
      if substr == "[]":
          substr = ""
      return substr
  
imports: import numpy
  import nevergrad.common.typing
  from nevergrad.common import errors
  from .None import _layering
  from .None import core
  from .container import Dict
  from .None import utils
label_desc: Use image node_id 1 for calling a global function with example usage: _param_string(parameters) and returns: substr