code: def _lower_unary(x):
      arg = _lower(x.arg)
      return Unary(x.op, arg)
  
file_path: funsor/funsor/compiler.py
imports: import functools
  import funsor
  from .cnf import Contraction
  from .ops.program import OpProgram, make_tuple
  from .tensor import Tensor
  from .terms import Binary, Funsor, Number, Tuple, Unary, Variable
label_desc: Use image node_id 6 for calling a global function with example usage: _lower_unary(x) and returns: Unary