class_docstr: Test flow to test @pytorch_parallel.
class_docstr_tok: ["Test","flow","to","test","@","pytorch_parallel","."]
code: def start(self):
      self.next(self.parallel_step, num_parallel=self.num_parallel)
  
imports: from metaflow import FlowSpec, step, batch, current, pytorch_parallel, Parameter
label_desc: Use image node_id 1 for calling the PytorchParallelTest obj's underlying member method code with example usage: obj.start() without return types