class_docstr: Test flow to test @parallel.
class_docstr_tok: ["Test","flow","to","test","@","parallel","."]
code: def end(self):
      pass
  
imports: from metaflow import FlowSpec, step, batch, current, parallel, Parameter
label_desc: Use image node_id 4 for calling the ParallelTest obj's underlying member method code with example usage: obj.end() without return types