code: def eager_unary(op, arg):
      return Constant(arg.const_inputs, op(arg.arg))
  
file_path: funsor/funsor/constant.py
imports: from collections import OrderedDict
  from functools import reduce
  import funsor.ops
  from funsor.tensor import Tensor
  from funsor.terms import Binary, Funsor, FunsorMeta, Number, Reduce, Unary, Variable, eager
label_desc: Use image node_id 5 for calling a global function with example usage: eager_unary(op, arg) and returns: Constant