code: def mock_session():
      session = Mock()
      session.sagemaker_client.create_training_job.return_value = {
          "TrainingJobArn": TRAINING_JOB_ARN
      }
      session.sagemaker_client.describe_training_job.return_value = (
          COMPLETED_TRAINING_JOB
      )
      session.settings = SessionSettings()
      session.default_bucket.return_value = BUCKET
      session.expand_role.return_value = ROLE_ARN
      session.boto_region_name = TEST_REGION
      session.sagemaker_config = None
      session._append_sagemaker_config_tags.return_value = []
      session.default_bucket_prefix = None
  
      return session
  
imports: from __future__ import absolute_import
  import os
  import sys
  import pytest
  from mock import patch, Mock, ANY, mock_open
  from mock.mock import MagicMock
  from sagemaker.config import load_sagemaker_config
  from sagemaker.remote_function.checkpoint_location import CheckpointLocation
  from sagemaker.remote_function.core.stored_function import _SerializedData
  from sagemaker.session_settings import SessionSettings
  from sagemaker.remote_function.spark_config import SparkConfig
  from sagemaker.remote_function.custom_file_filter import CustomFileFilter
  from sagemaker.remote_function.core.pipeline_variables import Context
  from sagemaker.workflow.pipeline_context import _PipelineConfig
  from sagemaker.workflow.pipeline_definition_config import PipelineDefinitionConfig
  from sagemaker.workflow.execution_variables import ExecutionVariables
  from sagemaker.utils import sagemaker_timestamp
  from tests.unit import DATA_DIR
  from sagemaker.remote_function.job import _JobSettings, _Job, _convert_run_to_json, _prepare_and_upload_runtime_scripts, _prepare_and_upload_workspace, _prepare_and_upload_spark_dependent_files, _upload_spark_submit_deps, _upload_serialized_spark_configuration, _extend_spark_config_to_request, _prepare_dependencies_and_pre_execution_scripts
label_desc: Use image node_id 3 for calling a global function with example usage: mock_session() and returns: session