code: def matmul(x, y):
      return __beaver_protocol("matmul", x, y)
  
imports: import crypten
  import crypten.communicator
  import torch
  from crypten.common.util import count_wraps
  from crypten.config import cfg
label_desc: Use image node_id 3 for calling a global function with example usage: matmul(x, y) and returns: __beaver_protocol