human
Solve the following python programming problem given the following code:
def Cleanup(benchmark_spec) : 
    'Stop and remove docker containers. Remove images.

  Args:
    benchmark_spec: The benchmark specification. Contains all data that is
        required to run the benchmark.
  ' 
    master = vm.vm_groups ['master'] [0] 
    workers = benchmark_spec.vm_groups ['workers'] 
    def CleanupCommon(vm) : 
        vm.RemoteCommand ('sudo docker rm -v data') 
        vm.RemoteCommand ('sudo docker rmi cloudsuite/movielens-dataset') 
        vm.RemoteCommand ('sudo docker rmi cloudsuite/spark') 
def CleanupMaster(vm) : 
        vm.RemoteCommand ('sudo docker stop spark-master') 
        vm.RemoteCommand ('sudo docker rm spark-master') 
        vm.RemoteCommand ('sudo docker rmi cloudsuite/in-memory-analytics') 
        CleanupCommon (vm) 
def CleanupWorker(vm) : 
        vm.RemoteCommand ('sudo docker stop spark-worker') 
        vm.RemoteCommand ('sudo docker rm spark-worker') 
        CleanupCommon (vm) 
target_arg_tuples = ([(CleanupWorker, [vm], { 
        
}) for vm in workers] + [(CleanupMaster, [master], { 
        
})]) 
    vm_util.RunParallelThreads (target_arg_tuples, len (target_arg_tuples)) 

    
    

    Fix the buggy line: master = vm.vm_groups ['master'] [0]
assistant
#Here is Python program to fix the buggy line: master = vm.

master = benchmark_spec.vm_groups ['master'] [0]