code: def squeeze_batch_dim(nest: types.Nest) -> types.NestedArray:
      return jax.tree_map(lambda x: jnp.squeeze(x, axis=0), 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 6 for calling a global function with example usage: squeeze_batch_dim(nest) and returns: jax