code: def unshard(pytree):
      """Reshapes all arrays in the pytree from [ndev, bs, ...] to [host_bs, ...].
  
      Args:
        pytree: A pytree of arrays to be sharded.
  
      Returns:
        Sharded data.
      """
  
      def _unshard_array(array):
          ndev, bs = array.shape[:2]
          return array.reshape((ndev * bs,) + array.shape[2:])
  
      return jax.tree_util.tree_map(_unshard_array, pytree)
  
imports: import collections
  import dataclasses
  import functools
  import itertools
  from typing import Any, Callable, Dict, Iterator, Optional, Sequence, Union
  from absl import logging
  from flax.training import common_utils
  import jax
  import jax.numpy
  import numpy
  import tensorflow
  import tensorflow_datasets
label_desc: Use image node_id 5 for calling a global function with example usage: unshard(pytree) and returns: jax, array