code: def substitute(node, vmap):
      """Substitute the var specified by vmap.
  
      Parameters
      ----------
      node: ObjectRef
          The input.
  
      vmap : Dict[Var, PrimExpr]
          The variable mapping.
  
      Returns
      -------
      result : tvm.tir.Stmt
          The result.
      """
      return _ffi_api.Substitute(node, vmap)
  
imports: from .function import PrimFunc
  from .None import _ffi_api
label_desc: Use image node_id 4 for calling a global function with example usage: substitute(node, vmap) and returns: _ffi_api