code: def random_s3_uri():
      return "".join(
          random.choices(string.ascii_uppercase + string.digits, k=10)
      )
  
imports: from __future__ import absolute_import
  import random
  import string
  import pytest
  from mock import patch, Mock
  from sagemaker.experiments.run import Run
  from sagemaker.workflow.parameters import ParameterInteger
  from sagemaker.workflow.function_step import DelayedReturn
  from sagemaker.remote_function.core.serialization import serialize_func_to_s3, deserialize_func_from_s3, serialize_obj_to_s3, deserialize_obj_from_s3, serialize_exception_to_s3, deserialize_exception_from_s3
  from sagemaker.remote_function.errors import ServiceError, SerializationError, DeserializationError
  from tblib import pickling_support
label_desc: Use image node_id 1 for calling a global function with example usage: random_s3_uri() and returns: str