code: def source_locations(jaxpr: core.Jaxpr):
      def key(eqn):
          return source_info_util.summarize(eqn.source_info)
  
      return histogram(jaxpr, key)
  
imports: from __future__ import annotations
  from collections import Counter, defaultdict
  import gzip
  import itertools
  import json
  import types
  from typing import Any, Callable, Union
  from jax._src import core
  from jax._src import util
  from jax._src import source_info_util
  from jax._src.lib import xla_client
label_desc: Use image node_id 7 for calling a global function with example usage: source_locations(jaxpr) and returns: histogram, source_info_util