code: def spans(self, run, worker):
      run_manager = self._reader.get_run_manager(run)
      if run_manager is None:
          return []
      if worker == "All":
          return run_manager.get_distributed_spans()
      return run_manager.get_spans(worker)
  
imports: import json
  from .profiler_reader import ProfilerReader
  from visualdl.server.api import gen_result
  from visualdl.server.api import result
label_desc: Use image node_id 5 for calling the ProfilerApi obj's underlying member method code with example usage: obj.spans(run, worker) and returns: run_manager, list, run_manager