feat: Support job checkpoint in remote function

Author: Ao Guo

src/sagemaker/remote_function/__init__.py

@@ -14,3 +14,4 @@
 from __future__ import absolute_import
 
 from sagemaker.remote_function.client import remote, RemoteExecutor  # noqa: F401
+from sagemaker.remote_function.checkpoint_location import CheckpointLocation  # noqa: F401

src/sagemaker/remote_function/checkpoint_location.py

@@ -0,0 +1,47 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+#     http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+"""This module is used to define the CheckpointLocation to remote function."""
+from __future__ import absolute_import
+
+from os import PathLike
+import re
+
+# Regex is taken from https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_CheckpointConfig.html
+S3_URI_REGEX_PATTERN = r"^(https|s3)://([^/]+)/?(.*)$"
+
+_JOB_CHECKPOINT_LOCATION = "/opt/ml/checkpoints/"
+
+
+def _validate_s3_uri_for_checkpoint(s3_uri: str):
+    """Validate if checkpoint location is specified with a valid s3 URI."""
+    return re.match(S3_URI_REGEX_PATTERN, s3_uri)
+
+
+class CheckpointLocation(PathLike):
+    """Class to represent the location where checkpoints are accessed in a remote function.
+
+    To save or load checkpoints in a remote function, pass an CheckpointLocation object as a
+    function parameter and use it as a os.PathLike object. This CheckpointLocation object
+    represents the local directory (/opt/ml/checkpoints/) of checkpoints in side the job.
+    """
+
+    _local_path = _JOB_CHECKPOINT_LOCATION
+
+    def __init__(self, s3_uri):
+        if not _validate_s3_uri_for_checkpoint(s3_uri):
+            raise ValueError("CheckpointLocation should be specified with valid s3 URI.")
+        self._s3_uri = s3_uri
+
+    def __fspath__(self):
+        """Return job local path where checkpoints are stored."""
+        return self._local_path

src/sagemaker/remote_function/job.py

@@ -46,6 +46,7 @@
 from sagemaker.experiments.run import Run
 from sagemaker.image_uris import get_base_python_image_uri
 from sagemaker import image_uris
+from sagemaker.remote_function.checkpoint_location import CheckpointLocation
 from sagemaker.session import get_execution_role, _logs_for_job, Session
 from sagemaker.utils import name_from_base, _tmpdir, resolve_value_from_config
 from sagemaker.s3 import s3_path_join, S3Uploader
@@ -673,6 +674,8 @@ def start(job_settings: _JobSettings, func, func_args, func_kwargs, run_info=Non
             RetryStrategy={"MaximumRetryAttempts": job_settings.max_retry_attempts},
         )
 
+        _update_job_request_with_checkpoint_config(func_args, func_kwargs, request_dict)
+
         if job_settings.tags:
             request_dict["Tags"] = job_settings.tags
 
@@ -1171,6 +1174,50 @@ def _extend_spark_config_to_request(
     return extended_request
 
 
+def _update_job_request_with_checkpoint_config(args, kwargs, request_dict):
+    """Extend job request with checkpoint config based on CheckpointLocation in function args.
+
+    Args:
+        args (tuple): The positional arguments of the remote function.
+        kwargs (Dict): The keyword arguments of the remote function.
+        request_dict (Dict): create training job request dict.
+    """
+    checkpoint_location_index_in_args = None
+    checkpoint_location_key_in_kwargs = None
+    checkpoint_location_count = 0
+
+    for index, arg in enumerate(args):
+        if isinstance(arg, CheckpointLocation):
+            checkpoint_location_index_in_args = index
+            checkpoint_location_count += 1
+
+    for key, value in kwargs.items():
+        if isinstance(value, CheckpointLocation):
+            checkpoint_location_key_in_kwargs = key
+            checkpoint_location_count += 1
+
+    if checkpoint_location_count < 1:
+        return
+
+    if checkpoint_location_count > 1:
+        raise ValueError(
+            "Remote function cannot have more than one argument of type CheckpointLocation."
+        )
+
+    if checkpoint_location_index_in_args is not None:
+        checkpoint_location_arg = args[checkpoint_location_index_in_args]
+    else:
+        checkpoint_location_arg = kwargs[checkpoint_location_key_in_kwargs]
+
+    checkpoint_s3_uri = checkpoint_location_arg._s3_uri
+    checkpoint_local_path = checkpoint_location_arg._local_path
+
+    request_dict["CheckpointConfig"] = {
+        "LocalPath": checkpoint_local_path,
+        "S3Uri": checkpoint_s3_uri,
+    }
+
+
 @dataclasses.dataclass
 class _RunInfo:
     """Data class to hold information of the run object from context."""

tests/integ/sagemaker/remote_function/test_decorator.py

@@ -12,6 +12,7 @@
 # language governing permissions and limitations under the License.
 from __future__ import absolute_import
 import time
+from typing import Union
 
 
 import pytest
@@ -23,6 +24,7 @@
 import subprocess
 import shlex
 from sagemaker.experiments.run import Run, load_run
+from sagemaker.remote_function import CheckpointLocation
 from tests.integ.sagemaker.experiments.helpers import cleanup_exp_resources
 from sagemaker.experiments.trial_component import _TrialComponent
 from sagemaker.experiments._api_types import _TrialComponentStatusType
@@ -40,15 +42,27 @@
 
 from tests.integ.kms_utils import get_or_create_kms_key
 from tests.integ import DATA_DIR
+from tests.integ.s3_utils import assert_s3_files_exist
 
 ROLE = "SageMakerRole"
+CHECKPOINT_FILE_CONTENT = "test checkpoint file"
 
 
 @pytest.fixture(scope="module")
 def s3_kms_key(sagemaker_session):
     return get_or_create_kms_key(sagemaker_session=sagemaker_session)
 
 
+@pytest.fixture(scope="module")
+def checkpoint_s3_location(sagemaker_session):
+    def random_s3_uri():
+        return "".join(random.choices(string.ascii_uppercase + string.digits, k=10))
+
+    return "s3://{}/rm-func-checkpoints/{}".format(
+        sagemaker_session.default_bucket(), random_s3_uri()
+    )
+
+
 def test_decorator(sagemaker_session, dummy_container_without_error, cpu_instance_type):
     @remote(
         role=ROLE,
@@ -626,6 +640,61 @@ def divide(x, y):
     assert divide(20, 2) == 10
 
 
+def test_decorator_with_spot_instances_save_and_load_checkpoints(
+    sagemaker_session,
+    dummy_container_without_error,
+    cpu_instance_type,
+    checkpoint_s3_location,
+):
+    @remote(
+        role=ROLE,
+        image_uri=dummy_container_without_error,
+        instance_type=cpu_instance_type,
+        sagemaker_session=sagemaker_session,
+        use_spot_instances=True,
+        max_wait_time_in_seconds=48 * 60 * 60,
+    )
+    def save_checkpoints(checkpoint_path: Union[str, os.PathLike]):
+        file_path_1 = os.path.join(checkpoint_path, "checkpoint_1.json")
+        with open(file_path_1, "w") as f:
+            f.write(CHECKPOINT_FILE_CONTENT)
+
+        file_path_2 = os.path.join(checkpoint_path, "checkpoint_2.json")
+        with open(file_path_2, "w") as f:
+            f.write(CHECKPOINT_FILE_CONTENT)
+
+        return CHECKPOINT_FILE_CONTENT
+
+    @remote(
+        role=ROLE,
+        image_uri=dummy_container_without_error,
+        instance_type=cpu_instance_type,
+        sagemaker_session=sagemaker_session,
+        use_spot_instances=True,
+        max_wait_time_in_seconds=48 * 60 * 60,
+    )
+    def load_checkpoints(checkpoint_path: Union[str, os.PathLike]):
+        file_path_1 = os.path.join(checkpoint_path, "checkpoint_1.json")
+        with open(file_path_1, "r") as file:
+            file_content_1 = file.read()
+
+        file_path_2 = os.path.join(checkpoint_path, "checkpoint_2.json")
+        with open(file_path_2, "r") as file:
+            file_content_2 = file.read()
+
+        return file_content_1 + file_content_2
+
+    assert save_checkpoints(CheckpointLocation(checkpoint_s3_location)) == CHECKPOINT_FILE_CONTENT
+    assert_s3_files_exist(
+        sagemaker_session, checkpoint_s3_location, ["checkpoint_1.json", "checkpoint_2.json"]
+    )
+
+    assert (
+        load_checkpoints(CheckpointLocation(checkpoint_s3_location))
+        == CHECKPOINT_FILE_CONTENT + CHECKPOINT_FILE_CONTENT
+    )
+
+
 @pytest.mark.skip
 def test_decorator_with_spark_job(sagemaker_session, cpu_instance_type):
     @remote(