code: def count_instances_from_args(args: argparse.Namespace):
      from allennlp.training.util import data_loaders_from_params
  
      params = Params.from_file(args.param_path)
  
      data_loaders = data_loaders_from_params(
          params, train=True, validation=False, test=False
      )
      instances = sum(
          1
          for data_loader in data_loaders.values()
          for _ in data_loader.iter_instances()
      )
  
      print(
          f"Success! One epoch of training contains {instances} instances."
      )
  
imports: import argparse
  import logging
  from allennlp.commands.subcommand import Subcommand
  from allennlp.common.params import Params
label_desc: Use image node_id 1 for calling a global function with example usage: count_instances_from_args(args) without return types