diff --git a/infer/lib/rvcmd.py b/infer/lib/rvcmd.py
index 2f916a5..db4c89f 100644
--- a/infer/lib/rvcmd.py
+++ b/infer/lib/rvcmd.py
@@ -7,17 +7,19 @@ import logging
 
 logger = logging.getLogger(__name__)
 
+
 def sha256(f) -> str:
     sha256_hash = hashlib.sha256()
     # Read and update hash in chunks of 4M
-    for byte_block in iter(lambda: f.read(4*1024*1024), b""):
+    for byte_block in iter(lambda: f.read(4 * 1024 * 1024), b""):
         sha256_hash.update(byte_block)
     return sha256_hash.hexdigest()
 
+
 def check_model(dir_name: Path, model_name: str, hash: str) -> bool:
     target = dir_name / model_name
     relname = str(target)
-    relname = relname[relname.rindex("assets/"):]
+    relname = relname[relname.rindex("assets/") :]
     logger.debug(f"checking {relname}...")
     if not os.path.exists(target):
         logger.info(f"{target} not exist.")
@@ -31,16 +33,25 @@ def check_model(dir_name: Path, model_name: str, hash: str) -> bool:
             return False
     return True
 
+
 def check_all_assets() -> bool:
     BASE_DIR = Path(__file__).resolve().parent.parent.parent
 
     logger.info("checking hubret & rmvpe...")
 
-    if not check_model(BASE_DIR / "assets/hubert", "hubert_base.pt", os.environ["sha256_hubert_base_pt"]):
+    if not check_model(
+        BASE_DIR / "assets/hubert",
+        "hubert_base.pt",
+        os.environ["sha256_hubert_base_pt"],
+    ):
         return False
-    if not check_model(BASE_DIR / "assets/rmvpe", "rmvpe.pt", os.environ["sha256_rmvpe_pt"]):
+    if not check_model(
+        BASE_DIR / "assets/rmvpe", "rmvpe.pt", os.environ["sha256_rmvpe_pt"]
+    ):
         return False
-    if not check_model(BASE_DIR / "assets/rmvpe", "rmvpe.onnx", os.environ["sha256_rmvpe_onnx"]):
+    if not check_model(
+        BASE_DIR / "assets/rmvpe", "rmvpe.onnx", os.environ["sha256_rmvpe_onnx"]
+    ):
         return False
 
     rvc_models_dir = BASE_DIR / "assets/pretrained"
@@ -91,13 +102,16 @@ def check_all_assets() -> bool:
         BASE_DIR / "assets/uvr5_weights/onnx_dereverb_By_FoxJoy",
         "vocals.onnx",
         os.environ[f"sha256_uvr5_vocals_onnx"],
-    ): return False
+    ):
+        return False
 
     logger.info("all assets are already latest.")
     return True
 
+
 def download_and_extract_tar_gz(url: str, folder: str):
     import tarfile
+
     logger.info(f"downloading {url}")
     response = requests.get(url, stream=True)
     with BytesIO() as out_file:
@@ -108,8 +122,10 @@ def download_and_extract_tar_gz(url: str, folder: str):
             tar.extractall(folder)
         logger.info(f"extracted into {folder}")
 
+
 def download_and_extract_zip(url: str, folder: str):
     import zipfile
+
     logger.info(f"downloading {url}")
     response = requests.get(url)
     with BytesIO() as out_file:
@@ -120,14 +136,22 @@ def download_and_extract_zip(url: str, folder: str):
             zip_ref.extractall(folder)
         logger.info(f"extracted into {folder}")
 
+
 def download_all_assets(tmpdir: str, version="0.2.1"):
     import subprocess
     import platform
 
     archs = {
-        "aarch64": "arm64", "armv8l": "arm64", "arm64": "arm64",
-        "x86": "386", "i386": "386", "i686": "386", "386": "386",
-        "x86_64": "amd64", "x64": "amd64", "amd64": "amd64",
+        "aarch64": "arm64",
+        "armv8l": "arm64",
+        "arm64": "arm64",
+        "x86": "386",
+        "i386": "386",
+        "i686": "386",
+        "386": "386",
+        "x86_64": "amd64",
+        "x64": "amd64",
+        "amd64": "amd64",
     }
     system_type = platform.system().lower()
     architecture = platform.machine().lower()
@@ -139,7 +163,7 @@ def download_all_assets(tmpdir: str, version="0.2.1"):
         exit(1)
     BASE_URL = "https://github.com/RVC-Project/RVC-Models-Downloader/releases/download/"
     suffix = "zip" if is_win else "tar.gz"
-    RVCMD_URL = BASE_URL+f"v{version}/rvcmd_{system_type}_{architecture}.{suffix}"
+    RVCMD_URL = BASE_URL + f"v{version}/rvcmd_{system_type}_{architecture}.{suffix}"
     cmdfile = tmpdir + "/rvcmd"
     if is_win:
         download_and_extract_zip(RVCMD_URL, tmpdir)