code: def _merge(a, b):
      """Merges two dictionaries and returns a new one."""
      c = dict(a)
      c.update(b)
      return c
  
file_path: sonnet/sonnet/src/functional/optimizers.py
imports: import collections
  import functools
  from typing import Callable, Type
  from sonnet.src import base
  from sonnet.src.functional import haiku
  import tensorflow
  import tree
label_desc: Use image node_id 3 for calling a global function with example usage: _merge(a, b) and returns: c