deprecation: Remove explicit partitions key requirement on pysdk side.

Clean up API for SMP v2.
`partitions` key will still be checked on library side for SMP v1.

Remove related test checking that error is thrown if partitions is not passed.

Author: viclzhu

src/sagemaker/fw_utils.py

@@ -327,9 +327,6 @@ def validate_mp_config(config):
         ValueError: If any of the keys have incorrect values.
     """
 
-    if "partitions" not in config:
-        raise ValueError("'partitions' is a required parameter.")
-
     def validate_positive(key):
         try:
             if not isinstance(config[key], int) or config[key] < 1:

tests/unit/test_fw_utils.py

@@ -135,12 +135,6 @@ def test_tar_and_upload_dir_s3_without_kms_with_overridden_settings(utils, sagem
     obj.upload_file.assert_called_with(utils.create_tar_file(), ExtraArgs=None)
 
 
-def test_mp_config_partition_exists():
-    mp_parameters = {}
-    with pytest.raises(ValueError):
-        fw_utils.validate_mp_config(mp_parameters)
-
-
 @pytest.mark.parametrize(
     "pipeline, placement_strategy, optimize, trace_device",
     [