python: support Path in GPT4All.__init__ (nomic-ai#1462)

Author: cebtenzzre

gpt4all-bindings/python/gpt4all/gpt4all.py

@@ -1,6 +1,8 @@
 """
 Python only API for running all GPT4All models.
 """
+from __future__ import annotations
+
 import os
 import sys
 import time
@@ -60,7 +62,7 @@ class GPT4All:
     def __init__(
         self,
         model_name: str,
-        model_path: Optional[str] = None,
+        model_path: Optional[Union[str, os.PathLike[str]]] = None,
         model_type: Optional[str] = None,
         allow_download: bool = True,
         n_threads: Optional[int] = None,
@@ -115,7 +117,7 @@ def list_models() -> List[ConfigType]:
     @staticmethod
     def retrieve_model(
         model_name: str,
-        model_path: Optional[str] = None,
+        model_path: Optional[Union[str, os.PathLike[str]]] = None,
         allow_download: bool = True,
         verbose: bool = True,
     ) -> ConfigType:
@@ -160,7 +162,7 @@ def retrieve_model(
                 )
             model_path = DEFAULT_MODEL_DIRECTORY
         else:
-            model_path = model_path.replace("\\", "\\\\")
+            model_path = str(model_path).replace("\\", "\\\\")
 
         if not os.path.exists(model_path):
             raise ValueError(f"Invalid model directory: {model_path}")
@@ -185,7 +187,7 @@ def retrieve_model(
     @staticmethod
     def download_model(
         model_filename: str,
-        model_path: str,
+        model_path: Union[str, os.PathLike[str]],
         verbose: bool = True,
         url: Optional[str] = None,
     ) -> str: