refactor nproc_per_node for backwards compatibility

src/sagemaker/remote_function/client.py

@@ -91,7 +91,7 @@ def remote(
     use_spot_instances=False,
     max_wait_time_in_seconds=None,
     use_torchrun=False,
-    nproc_per_node=1,
+    nproc_per_node: Optional[int] = None,
 ):
     """Decorator for running the annotated function as a SageMaker training job.
 
@@ -284,8 +284,8 @@ def remote(
         use_torchrun (bool): Specifies whether to use torchrun for distributed training.
           Defaults to ``False``.
 
-        nproc_per_node (int): Specifies the number of processes per node for
-          distributed training. Defaults to ``1``.
+        nproc_per_node (Optional int): Specifies the number of processes per node for
+          distributed training. Defaults to ``None``.
           This is defined automatically configured on the instance type.
     """
 
@@ -320,6 +320,7 @@ def _remote(func):
             use_spot_instances=use_spot_instances,
             max_wait_time_in_seconds=max_wait_time_in_seconds,
             use_torchrun=use_torchrun,
+            nproc_per_node=nproc_per_node,
         )
 
         @functools.wraps(func)
@@ -536,7 +537,7 @@ def __init__(
         use_spot_instances=False,
         max_wait_time_in_seconds=None,
         use_torchrun=False,
-        nproc_per_node=1,
+        nproc_per_node: Optional[int] = None,
     ):
         """Constructor for RemoteExecutor
 
@@ -729,8 +730,8 @@ def __init__(
             use_torchrun (bool): Specifies whether to use torchrun for distributed training.
               Defaults to ``False``.
 
-            nproc_per_node (int): Specifies the number of processes per node for
-              distributed training. Defaults to ``1``.
+            nproc_per_node (Optional int): Specifies the number of processes per node for
+              distributed training. Defaults to ``None``.
               This is defined automatically configured on the instance type.
         """
         self.max_parallel_jobs = max_parallel_jobs
@@ -777,6 +778,7 @@ def __init__(
             use_spot_instances=use_spot_instances,
             max_wait_time_in_seconds=max_wait_time_in_seconds,
             use_torchrun=use_torchrun,
+            nproc_per_node=nproc_per_node,
         )
 
         self._state_condition = threading.Condition()

src/sagemaker/remote_function/job.py

@@ -282,6 +282,7 @@ def __init__(
         use_spot_instances=False,
         max_wait_time_in_seconds=None,
         use_torchrun: bool = False,
+        nproc_per_node: Optional[int] = None,
     ):
         """Initialize a _JobSettings instance which configures the remote job.
 
@@ -463,6 +464,13 @@ def __init__(
             max_wait_time_in_seconds (int): Timeout in seconds waiting for spot training job.
               After this amount of time Amazon SageMaker will stop waiting for managed spot
               training job to complete. Defaults to ``None``.
+
+            use_torchrun (bool): Specifies whether to use torchrun for distributed training.
+              Defaults to ``False``.
+
+            nproc_per_node (Optional int): Specifies the number of processes per node for
+              distributed training. Defaults to ``None``.
+              This is defined automatically configured on the instance type.
         """
         self.sagemaker_session = sagemaker_session or Session()
         self.environment_variables = resolve_value_from_config(
@@ -622,6 +630,7 @@ def __init__(
         self.tags = self.sagemaker_session._append_sagemaker_config_tags(tags, REMOTE_FUNCTION_TAGS)
 
         self.use_torchrun = use_torchrun
+        self.nproc_per_node = nproc_per_node
 
     @staticmethod
     def _get_default_image(session):
@@ -749,7 +758,6 @@ def start(job_settings: _JobSettings, func, func_args, func_kwargs, run_info=Non
         )
 
         logger.info("Creating job: %s", job_name)
-        logger.info("Environment variables: %s", training_job_request["Environment"])
 
         job_settings.sagemaker_session.sagemaker_client.create_training_job(**training_job_request)
 
@@ -1027,6 +1035,7 @@ def _prepare_and_upload_runtime_scripts(
     s3_kms_key: str,
     sagemaker_session: Session,
     use_torchrun: bool = False,
+    nproc_per_node: Optional[int] = None,
 ):
     """Copy runtime scripts to a folder and upload to S3.
 
@@ -1044,6 +1053,8 @@ def _prepare_and_upload_runtime_scripts(
         sagemaker_session (str): SageMaker boto client session.
 
         use_torchrun (bool): Whether to use torchrun or not.
+
+        nproc_per_node (Optional[int]): Number of processes per node
     """
 
     from sagemaker.workflow.utilities import load_step_compilation_context
@@ -1068,6 +1079,12 @@ def _prepare_and_upload_runtime_scripts(
         if use_torchrun:
             entry_point_script = ENTRYPOINT_TORCHRUN_SCRIPT
 
+            if nproc_per_node is not None and nproc_per_node > 0:
+                entry_point_script = entry_point_script.replace(
+                    "$SM_NPROC_PER_NODE",
+                    str(nproc_per_node)
+                )
+
         with open(entrypoint_script_path, "w", newline="\n") as file:
             file.writelines(entry_point_script)
 
@@ -1106,6 +1123,7 @@ def _generate_input_data_config(job_settings: _JobSettings, s3_base_uri: str):
         s3_kms_key=job_settings.s3_kms_key,
         sagemaker_session=job_settings.sagemaker_session,
         use_torchrun=job_settings.use_torchrun,
+        nproc_per_node=job_settings.nproc_per_node,
     )
 
     input_data_config = [

tests/unit/sagemaker/remote_function/test_job.py

@@ -390,6 +390,7 @@ def test_start(
         s3_kms_key=None,
         sagemaker_session=session(),
         use_torchrun=False,
+        nproc_per_node=None,
     )
 
     mock_dependency_upload.assert_called_once_with(
@@ -672,6 +673,7 @@ def test_start_with_complete_job_settings(
         s3_kms_key=job_settings.s3_kms_key,
         sagemaker_session=session(),
         use_torchrun=False,
+        nproc_per_node=None,
     )
 
     mock_user_workspace_upload.assert_called_once_with(
@@ -843,6 +845,7 @@ def test_get_train_args_under_pipeline_context(
         s3_kms_key=job_settings.s3_kms_key,
         sagemaker_session=session(),
         use_torchrun=False,
+        nproc_per_node=None,
     )
 
     mock_user_workspace_upload.assert_called_once_with(
@@ -1018,6 +1021,7 @@ def test_start_with_spark(
         s3_kms_key=None,
         sagemaker_session=session(),
         use_torchrun=False,
+        nproc_per_node=None,
     )
 
     session().sagemaker_client.create_training_job.assert_called_once_with(
@@ -1633,6 +1637,7 @@ def test_start_with_torchrun_single_node(
         instance_type="ml.g5.12xlarge",
         encrypt_inter_container_traffic=True,
         use_torchrun=True,
+        nproc_per_node=None,
     )
 
     job = _Job.start(job_settings, job_function, func_args=(1, 2), func_kwargs={"c": 3, "d": 4})
@@ -1658,6 +1663,7 @@ def test_start_with_torchrun_single_node(
         s3_kms_key=None,
         sagemaker_session=session(),
         use_torchrun=True,
+        nproc_per_node=None,
     )
 
     mock_dependency_upload.assert_called_once_with(
@@ -1759,6 +1765,7 @@ def test_start_with_torchrun_multi_node(
         instance_type="ml.g5.2xlarge",
         encrypt_inter_container_traffic=True,
         use_torchrun=True,
+        nproc_per_node=None,
     )
 
     job = _Job.start(job_settings, job_function, func_args=(1, 2), func_kwargs={"c": 3, "d": 4})
@@ -1784,6 +1791,7 @@ def test_start_with_torchrun_multi_node(
         s3_kms_key=None,
         sagemaker_session=session(),
         use_torchrun=True,
+        nproc_per_node=None,
     )
 
     mock_dependency_upload.assert_called_once_with(