code: def arg(ctx, x):
      x = ctx.convert(x)
      re = ctx._re(x)
      im = ctx._im(x)
      return ctx.atan2(im, re)
  
imports: from ..libmp.backend import xrange
  import math
  import cmath
label_desc: Use image node_id 26 for calling a global function with example usage: arg(ctx, x) and returns: ctx