code: def __init__(self, expand_nested, **dot_kwargs):
      self.expand_nested = expand_nested
      self.dot_kwargs = dot_kwargs
      self.node_names = {}
      self.inner_dot_nodes = {}
  
file_path: baikal/baikal/plot.py
imports: import io
  import os
  from typing import Optional
  from baikal import Model
  from baikal._core.utils import make_name, safezip2
label_desc: Use image node_id 1 to create a new _DotTransformer object  with example: obj = _DotTransformer(expand_nested)