code: def t_to_alpha_sigma(t):
      return paddle.cos(t * math.pi / 2), paddle.sin(t * math.pi / 2)
  
imports: import math
  from dataclasses import dataclass
  from functools import partial
  import paddle
  import paddle.nn
label_desc: Use image node_id 4 for calling a global function with example usage: t_to_alpha_sigma(t) and returns: paddle,  paddle