class_docstr: FrozenModel
class_docstr_tok: ["FrozenModel"]
docstr: model: saved model dir, ckpt dir or frozen_graph_pb path
  gpu_str: list of gpu devices. e.g. '' for cpu, '0,1' for gpu 0,1
docstr_tok: ["model",":","saved","model","dir",",","ckpt","dir","or","frozen_graph_pb","path","gpu_str",":","list","of","gpu","devices",".","e.g.","``","for","cpu",",","'","0,1","'","for","gpu","0,1"]
code: def __init__(self, model, gpu_str=None):
      """
      model: saved model dir, ckpt dir or frozen_graph_pb path
      gpu_str: list of gpu devices. e.g. '' for cpu, '0,1' for gpu 0,1
      """
      self.init_session(model, gpu_str)
  
imports: import os
  import sys
  import abc
  from absl import logging
  import delta.compat
  from delta import utils
label_desc: Use image node_id 1 to create a new FrozenModel object from inherited base classes: ABCFrozenModel with example: obj = FrozenModel(model, gpu_str)