enable usage of Path object for yaml_file config_space

neps/api.py

@@ -318,7 +318,7 @@ def _run_args(
         if isinstance(pipeline_space, CS.ConfigurationSpace):
             pipeline_space = pipeline_space_from_configspace(pipeline_space)
         # Support pipeline space as YAML file
-        elif isinstance(pipeline_space, str):
+        elif isinstance(pipeline_space, (str, Path)):
             pipeline_space = pipeline_space_from_yaml(pipeline_space)
 
         # Support pipeline space as mix of ConfigurationSpace and neps parameters

neps/search_spaces/search_space.py

@@ -76,7 +76,8 @@ def pipeline_space_from_yaml(yaml_file_path):
     maps parameter names to their respective configuration objects.
 
     Args:
-        yaml_file_path (str): Path to the YAML file containing parameter configurations.
+        yaml_file_path (Union[str, Path]): Path to the YAML file containing parameter
+        configurations.
 
     Returns:
         dict: A dictionary where keys are parameter names and values are parameter
@@ -109,7 +110,7 @@ def pipeline_space_from_yaml(yaml_file_path):
                 config = yaml.safe_load(file)
         except yaml.YAMLError as e:
             raise ValueError(
-                f"The file at {yaml_file_path} is not a valid YAML file."
+                f"The file at {str(yaml_file_path)} is not a valid YAML file."
             ) from e
 
         # check for init key search_space

tests/test_yaml_search_space/test_search_space.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 import pytest
 from neps.search_spaces.search_space import (
     SearchSpaceFromYamlFileError,
@@ -94,7 +96,9 @@ def test_correct_including_priors_yaml_file():
 def test_incorrect_yaml_file():
     """Test the function with an incorrectly formatted YAML file."""
     with pytest.raises(SearchSpaceFromYamlFileError) as excinfo:
-        pipeline_space_from_yaml("tests/test_yaml_search_space/incorrect_config.txt")
+        pipeline_space_from_yaml(
+            Path("tests/test_yaml_search_space/incorrect_config.txt")
+        )
     assert str(excinfo.value.exception_type == "ValueError")
 
 
@@ -117,7 +121,7 @@ def test_yaml_file_with_inconsistent_types():
     assert str(excinfo.value.exception_type == "TypeError")
     with pytest.raises(SearchSpaceFromYamlFileError) as excinfo:
         pipeline_space_from_yaml(
-            "tests/test_yaml_search_space/inconsistent_types_config2.yml"
+            Path("tests/test_yaml_search_space/inconsistent_types_config2.yml")
         )
     assert str(excinfo.value.exception_type == "TypeError")