code: def transformer(sagemaker_session):
      return Transformer(
          MODEL_NAME,
          INSTANCE_COUNT,
          INSTANCE_TYPE,
          output_path=OUTPUT_PATH,
          sagemaker_session=sagemaker_session,
          volume_kms_key=KMS_KEY_ID,
      )
  
imports: from __future__ import absolute_import
  import pytest
  from mock import MagicMock, Mock, patch, PropertyMock
  from sagemaker.session_settings import SessionSettings
  from sagemaker.transformer import _TransformJob, Transformer
  from sagemaker.workflow.pipeline_context import PipelineSession, _PipelineConfig
  from sagemaker.inputs import BatchDataCaptureConfig
  from sagemaker.workflow.pipeline_definition_config import PipelineDefinitionConfig
  from tests.integ import test_local_mode
  from tests.unit import SAGEMAKER_CONFIG_TRANSFORM_JOB
label_desc: Use image node_id 4 for calling a global function with example usage: transformer(sagemaker_session) and returns: Transformer