code: def scp_file(self, file, remote_dir):
      for host in self.remote_hosts:
          p = subprocess.Popen(
              ["scp", file, "root@{}:{}/".format(host, remote_dir)]
          )
          os.waitpid(p.pid, 0)
  
file_path: analytics-zoo/pyzoo/zoo/orca/learn/mpi/mpi_runner.py
imports: import os
  import sys
  import subprocess
  from zoo.util.utils import get_node_ip
label_desc: Use image node_id 3 for calling the MPIRunner obj's underlying member method code with example usage: obj.scp_file(file, remote_dir) without return types