code: def build_task(config):
      """Builds a ClassyTask from a config.
  
      This assumes a 'name' key in the config which is used to determine what
      task class to instantiate. For instance, a config `{"name": "my_task",
      "foo": "bar"}` will find a class that was registered as "my_task"
      (see :func:`register_task`) and call .from_config on it."""
  
      task = TASK_REGISTRY[config.TRAINER.TASK_NAME].from_config(config)
      return task
  
imports: import gc
  import itertools
  import logging
  import os
  import socket
  import time
  from types import SimpleNamespace
  from typing import Any, Dict, List, Tuple
  import numpy
  import torch
  import torch.distributed
  from classy_vision.generic.distributed_util import barrier, is_primary, set_cpu_device, set_cuda_device_index
  from classy_vision.hooks.classy_hook import ClassyHook
  from classy_vision.tasks import ClassyTask, TASK_REGISTRY
  from vissl.config import AttrDict
  from vissl.hooks import SSLClassyHookFunctions
  from vissl.models.model_helpers import get_trunk_output_feature_names
  from vissl.trainer.train_steps import get_train_step
  from vissl.utils.distributed_utils import all_gather_heterogeneous, all_gather_sizes
  from vissl.utils.env import get_machine_local_and_dist_rank
  from vissl.utils.io import save_file
label_desc: Use image node_id 1 for calling a global function with example usage: build_task(config) and returns: task