class_docstr: CFG visitor that determines reaching definitions at statement level.
class_docstr_tok: ["CFG","visitor","that","determines","reaching","definitions","at","statement","level","."]
code: def __init__(self, graph, external_defs):
      super(Analyzer, self).__init__(graph)
      # This allows communicating that nodes have extra reaching definitions,
      # e.g. those that a function closes over.
      self.external_defs = external_defs
  
imports: import gast
  from nvidia.dali._autograph.pyct import anno
  from nvidia.dali._autograph.pyct import cfg
  from nvidia.dali._autograph.pyct import transformer
label_desc: Use image node_id 1 to create a new Analyzer object from inherited base classes: cfg with example: obj = Analyzer(graph, external_defs)