code: def save(self, save_model_dir=None, global_step=None):
      self._model.save(
          save_model_dir=save_model_dir, global_step=global_step
      )
  
file_path: openrec/openrec/tf1/fast_dot_product_server.py
imports: import numpy
  import tensorflow
  from termcolor import colored
  from openrec.tf1.recommenders import PMF
  from openrec.tf1.modules.extractions import LatentFactor
  import math
label_desc: Use image node_id 6 for calling the FastDotProductServer obj's underlying member method code with example usage: obj.save(save_model_dir, global_step) without return types