code: def fp16ize(model, optimizer, fp16_opt_level):
      try:
          # noinspection PyUnresolvedReferences,PyPackageRequirements
          from apex import amp
      except ImportError:
          raise ImportError(
              "Please install apex from https://www.github.com/nvidia/apex to use fp16 training."
          )
      model, optimizer = amp.initialize(
          model, optimizer, opt_level=fp16_opt_level
      )
      return model, optimizer
  
file_path: jiant/jiant/shared/model_setup.py
imports: import transformers
  import torch
  from jiant.ext.radam import RAdam
label_desc: Use image node_id 4 for calling a global function with example usage: fp16ize(model, optimizer, fp16_opt_level) and returns: model,  optimizer