code: def get_model(model_type):
      model_type = model_type.lower()
      if model_type not in MODELS:
          raise ValueError(
              '"{}" is not a valid model_type'.format(model_type)
          )
  
      return MODELS[model_type]
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_model(model_type) and returns: MODELS