code: def post_order_visit(expr, fvisit):
      """Recursively visit the ir in post DFS order node,
      apply fvisit. Each node is guaranteed to be visited
      only once.
  
      Parameters
      ----------
      expr : tvm.relay.Expr
          The input expression.
  
      fvisit : function
          The visitor function to be applied.
      """
      return _ffi_api.post_order_visit(expr, fvisit)
  
imports: from ...ir import IRModule
  from ...relay import transform, build_module
  from ...runtime.ndarray import cpu
  from .None import _ffi_api
  from .feature import Feature
label_desc: Use image node_id 1 for calling a global function with example usage: post_order_visit(expr, fvisit) and returns: _ffi_api