code: def __init__(self, learning_rate):
      self.net = SimpleCNN(learning_rate=learning_rate)
  
file_path: BigDL/python/orca/example/ray_on_spark/parameter_server/sync_parameter_server.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import argparse
  import os
  import numpy
  import ray
  from model import SimpleCNN, download_mnist_retry
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca import OrcaContext
label_desc: Use image node_id 1 to create a new ParameterServer object from inherited base classes: object with example: obj = ParameterServer(learning_rate)