class_docstr: Main class for storing the causal model state.
docstr: View the causal DAG.
  
  :param layout: string specifying the layout of the graph.
  :param size: tuple (x, y) specifying the width and height of the figure in inches.
  :param file_name: string specifying the file name for the saved causal graph png.
  
  :returns: a visualization of the graph
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code: def view_model(
      self, layout=None, size=(8, 6), file_name="causal_model"
  ):
      """View the causal DAG.
  
      :param layout: string specifying the layout of the graph.
      :param size: tuple (x, y) specifying the width and height of the figure in inches.
      :param file_name: string specifying the file name for the saved causal graph png.
  
      :returns: a visualization of the graph
  
      """
      self._graph.view_graph(layout, size, file_name)
  
imports: import logging
  import typing
  import warnings
  from itertools import combinations
  from sympy import init_printing
  import dowhy.causal_estimators
  import dowhy.causal_refuters
  import dowhy.graph_learners
  from dowhy.causal_estimator import CausalEstimate, estimate_effect
  from dowhy.causal_graph import CausalGraph
  from dowhy.causal_identifier import AutoIdentifier, BackdoorAdjustment, IDIdentifier
  from dowhy.causal_identifier.identify_effect import EstimandType
  from dowhy.causal_refuters.graph_refuter import GraphRefuter
  from dowhy.utils.api import parse_state
label_desc: Use image node_id 12 for calling the CausalModel obj's underlying member method code with example usage: obj.view_model(layout, size, file_name) without return types