class_docstr: Test functionality related to create_agent_from_opt_file.
class_docstr_tok: ["Test","functionality","related","to","create_agent_from_opt_file","."]
code: def test_init_from_from_checkpoint(self):
      with testing_utils.tempdir() as temp_dir:
          opt_from_file = {
              "datapath": "dummy_path",
              "model": "repeat_label",
              "init_model": os.path.join(temp_dir, "something"),
              "model_file": os.path.join(temp_dir, "something_else"),
          }
          opt = Opt(
              {
                  "datapath": "dummy_path",
                  "model": "repeat_label",
                  "init_model": os.path.join(
                      temp_dir, "something_else.checkpoint"
                  ),
                  "model_file": os.path.join(
                      temp_dir, "something_else"
                  ),
                  "load_from_checkpoint": True,
              }
          )
  
          with open(
              os.path.join(temp_dir, "something_else.opt"), "w"
          ) as f:
              f.write(json.dumps(opt_from_file))
  
          agent = create_agent_from_opt_file(opt)
          init_model = agent.opt["init_model"]
          # assert that the model was loaded with the correct checkpoitn
          assert ".checkpoint" in init_model
  
imports: import json
  import os
  import unittest
  import parlai.utils.testing
  from parlai.core.agents import create_agent_from_opt_file
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.scripts.compare_opts import compare_opts
label_desc: Use image node_id 1 for calling the TestCreateAgentFromOpt obj's underlying member method code with example usage: obj.test_init_from_from_checkpoint() without return types