code: def save_to_file(self, data_frame, file_name):
      file_name = f"data_frames/{file_name}.csv"
      data_frame.to_csv(file_name, encoding="utf-8", index=False)
  
file_path: pytorch/benchmarks/distributed/rpc/parameter_server/metrics/ProcessedMetricsPrinter.py
imports: import statistics
  import pandas
  from tabulate import tabulate
label_desc: Use image node_id 5 for calling the ProcessedMetricsPrinter obj's underlying member method code with example usage: obj.save_to_file(data_frame, file_name) without return types