code: def get_from_first_device(nest: N, as_numpy: bool = True) -> N:
      """Gets the first array of a nest of `jax.Array`s.
  
      Args:
        nest: A nest of `jax.Array`s.
        as_numpy: If `True` then each `DeviceArray` that is retrieved is transformed
          (and copied if not on the host machine) into a `np.ndarray`.
  
      Returns:
        The first array of a nest of `jax.Array`s. Note that if
        `as_numpy=False` then the array will be a `DeviceArray` (which will live on
        the same device as the sharded device array). If `as_numpy=True` then the
        array will be copied to the host machine and converted into a `np.ndarray`.
      """
      zeroth_nest = jax.tree_map(lambda x: x[0], nest)
      return jax.device_get(zeroth_nest) if as_numpy else zeroth_nest
  
imports: import functools
  import itertools
  import queue
  import threading
  from typing import Callable, Iterable, Iterator, NamedTuple, Optional, Sequence, Tuple, TypeVar
  from absl import logging
  from acme import core
  from acme import types
  from acme.jax import types
  import haiku
  import jax
  import jax.numpy
  import numpy
  import reverb
  import tree
label_desc: Use image node_id 21 for calling a global function with example usage: get_from_first_device(nest, as_numpy) and returns: unknown