code: def main(cmd=None):
      r"""ST training.
  
      Example:
  
          % python st_train.py st --print_config --optim adadelta \
                  > conf/train_st.yaml
          % python st_train.py --config conf/train_st.yaml
      """
      STTask.main(cmd=cmd)
  
label_desc: Use image node_id 2 for calling a global function with example usage: main(cmd) without return types