code: def main(z, x):
      """main function."""
      return syn_cnn_2_mf(z, x), cost(z)
  
imports: from .syn_cnn_2 import syn_cnn_2_z_x
label_desc: Use image node_id 4 for calling a global function with example usage: main(z, x) and returns: syn_cnn_2_mf,  cost