code: def clone_causal_models(source: HasNodes, destination: HasNodes):
      for node in destination.nodes:
          if CAUSAL_MECHANISM in source.nodes[node]:
              destination.nodes[node][CAUSAL_MECHANISM] = source.nodes[
                  node
              ][CAUSAL_MECHANISM].clone()
  
imports: from typing import Any, Callable, Optional, Union
  import networkx
  from dowhy.gcm.causal_mechanisms import ConditionalStochasticModel, FunctionalCausalModel, InvertibleFunctionalCausalModel, StochasticModel
  from dowhy.graph import DirectedGraph, HasNodes, get_ordered_predecessors, is_root_node, validate_acyclic, validate_node_in_graph
label_desc: Use image node_id 7 for calling a global function with example usage: clone_causal_models(source, destination) without return types