change: Check that session is a LocalSession when using local mode

src/sagemaker/estimator.py

@@ -218,6 +218,11 @@ def __init__(
             if self.train_instance_type == "local_gpu" and self.train_instance_count > 1:
                 raise RuntimeError("Distributed Training in Local GPU is not supported")
             self.sagemaker_session = sagemaker_session or LocalSession()
+            if not isinstance(self.sagemaker_session, sagemaker.local.LocalSession):
+                raise RuntimeError(
+                    "instance_type local or local_gpu is only supported with an"
+                    "instance of LocalSession"
+                )
         else:
             self.sagemaker_session = sagemaker_session or Session()
 

tests/integ/test_airflow_config.py

@@ -443,7 +443,7 @@ def test_rcf_airflow_config_uploads_data_source_to_s3(sagemaker_session, cpu_ins
 
 @pytest.mark.canary_quick
 def test_chainer_airflow_config_uploads_data_source_to_s3(
-    sagemaker_session, cpu_instance_type, chainer_full_version
+    sagemaker_local_session, cpu_instance_type, chainer_full_version
 ):
     with timeout(seconds=AIRFLOW_CONFIG_TIMEOUT_IN_SECONDS):
         script_path = os.path.join(DATA_DIR, "chainer_mnist", "mnist.py")
@@ -456,7 +456,7 @@ def test_chainer_airflow_config_uploads_data_source_to_s3(
             train_instance_type="local",
             framework_version=chainer_full_version,
             py_version=PYTHON_VERSION,
-            sagemaker_session=sagemaker_session,
+            sagemaker_session=sagemaker_local_session,
             hyperparameters={"epochs": 1},
             use_mpi=True,
             num_processes=2,
@@ -474,7 +474,7 @@ def test_chainer_airflow_config_uploads_data_source_to_s3(
         )
 
         _assert_that_s3_url_contains_data(
-            sagemaker_session,
+            sagemaker_local_session,
             training_config["HyperParameters"]["sagemaker_submit_directory"].strip('"'),
         )
 

tests/unit/test_estimator.py

@@ -30,6 +30,7 @@
 from sagemaker.session import s3_input, ShuffleConfig
 from sagemaker.transformer import Transformer
 from botocore.exceptions import ClientError
+import sagemaker.local
 
 MODEL_DATA = "s3://bucket/model.tar.gz"
 MODEL_IMAGE = "mi"
@@ -560,6 +561,7 @@ def test_local_code_location():
         boto_region_name=REGION,
         config=config,
         local_mode=True,
+        spec=sagemaker.local.LocalSession,
     )
     t = DummyFramework(
         entry_point=SCRIPT_PATH,
@@ -2231,7 +2233,7 @@ def test_deploy_with_no_model_name(sagemaker_session):
 @patch("sagemaker.estimator.LocalSession")
 @patch("sagemaker.estimator.Session")
 def test_local_mode(session_class, local_session_class):
-    local_session = Mock()
+    local_session = Mock(spec=sagemaker.local.LocalSession)
     local_session.local_mode = True
 
     session = Mock()
@@ -2259,7 +2261,7 @@ def test_distributed_gpu_local_mode(LocalSession):
 
 @patch("sagemaker.estimator.LocalSession")
 def test_local_mode_file_output_path(local_session_class):
-    local_session = Mock()
+    local_session = Mock(spec=sagemaker.local.LocalSession)
     local_session.local_mode = True
     local_session_class.return_value = local_session
 
@@ -2392,3 +2394,28 @@ def test_encryption_flag_in_non_vpc_mode_invalid(sagemaker_session):
         '"EnableInterContainerTrafficEncryption" and "VpcConfig" must be provided together'
         in str(error)
     )
+
+
+def test_estimator_local_mode_error(sagemaker_session):
+    # When using instance local with a session which is not LocalSession we should error out
+    with pytest.raises(RuntimeError):
+        Estimator(
+            image_name="some-image",
+            role="some_image",
+            train_instance_count=1,
+            train_instance_type="local",
+            sagemaker_session=sagemaker_session,
+            base_job_name="base_job_name",
+        )
+
+
+def test_estimator_local_mode_ok(sagemaker_local_session):
+    # When using instance local with a session which is not LocalSession we should error out
+    Estimator(
+        image_name="some-image",
+        role="some_image",
+        train_instance_count=1,
+        train_instance_type="local",
+        sagemaker_session=sagemaker_local_session,
+        base_job_name="base_job_name",
+    )