Tree: Switch to asynchronous file handling

Using aiofiles, there's no longer a possiblity of blocking file operations
that can hang up the event loop. In addition, partially migrate
classes to use asynchronous init instead of the normal python magic method.

The only exception is config, since that's handled in the synchonous
init before the event loop starts.

Signed-off-by: kingbri <bdashore3@proton.me>

common/transformers_utils.py

@@ -1,3 +1,4 @@
+import aiofiles
 import json
 import pathlib
 from typing import List, Optional, Union
@@ -15,11 +16,11 @@ class GenerationConfig(BaseModel):
     bad_words_ids: Optional[List[List[int]]] = None
 
     @classmethod
-    def from_file(self, model_directory: pathlib.Path):
+    async def from_file(self, model_directory: pathlib.Path):
         """Create an instance from a generation config file."""
 
         generation_config_path = model_directory / "generation_config.json"
-        with open(
+        async with aiofiles.open(
             generation_config_path, "r", encoding="utf8"
         ) as generation_config_json:
             generation_config_dict = json.load(generation_config_json)
@@ -43,12 +44,15 @@ class HuggingFaceConfig(BaseModel):
     badwordsids: Optional[str] = None
 
     @classmethod
-    def from_file(self, model_directory: pathlib.Path):
+    async def from_file(self, model_directory: pathlib.Path):
         """Create an instance from a generation config file."""
 
         hf_config_path = model_directory / "config.json"
-        with open(hf_config_path, "r", encoding="utf8") as hf_config_json:
-            hf_config_dict = json.load(hf_config_json)
+        async with aiofiles.open(
+            hf_config_path, "r", encoding="utf8"
+        ) as hf_config_json:
+            contents = await hf_config_json.read()
+            hf_config_dict = json.loads(contents)
             return self.model_validate(hf_config_dict)
 
     def get_badwordsids(self):