code: def gammasgn(x, **kwargs):
      op = TensorGammaSgn(**kwargs)
      return op(x)
  
imports: import scipy.special
  from ..arithmetic.utils import arithmetic_operand
  from ..utils import infer_dtype, implement_scipy
  from .core import TensorSpecialUnaryOp, TensorSpecialMultiOp, TensorSpecialBinOp, _register_special_op
label_desc: Use image node_id 4 for calling a global function with example usage: gammasgn(x) and returns: op