code: def test_log_model_no_registered_model_name(
      auto_arima_model, tmp_path
  ):
      """Test log model calls register model without registered model name."""
      import mlflow
      from mlflow.utils.environment import _mlflow_conda_env
  
      from sktime.utils import mlflow_sktime
  
      artifact_path = "sktime"
      register_model_patch = mock.patch("mlflow.register_model")
      with mlflow.start_run(), register_model_patch:
          conda_env = tmp_path.joinpath("conda_env.yaml")
          _mlflow_conda_env(conda_env, additional_pip_deps=["sktime"])
          mlflow_sktime.log_model(
              sktime_model=auto_arima_model,
              artifact_path=artifact_path,
              conda_env=str(conda_env),
          )
          mlflow.register_model.assert_not_called()
  
imports: import os
  import sys
  from pathlib import Path
  from unittest import mock
  import numpy
  import pandas
  import pytest
  from sktime.datasets import load_airline, load_arrow_head, load_longley
  from sktime.forecasting.arima import AutoARIMA
  from sktime.forecasting.naive import NaiveForecaster
  from sktime.split import temporal_train_test_split
  from sktime.utils.multiindex import flatten_multiindex
  from sktime.utils.validation._dependencies import _check_soft_dependencies
label_desc: Use image node_id 23 for calling a global function with example usage: test_log_model_no_registered_model_name(auto_arima_model, tmp_path) without return types