code: def _ones_like(nest: types.Nest, dtype=None) -> types.NestedArray:
      return jax.tree_map(
          lambda x: jnp.ones(x.shape, dtype or x.dtype), nest
      )
  
imports: import dataclasses
  from typing import Any, Optional, Tuple, Union
  from acme import types
  from acme.utils import tree_utils
  import chex
  import jax
  import jax.numpy
  import numpy
  import tree
label_desc: Use image node_id 3 for calling a global function with example usage: _ones_like(nest, dtype) and returns: jax