add seed-vc model (#60)

* init seed-vc

* seed-vc workflow

* put seed-vc in the right dir

voice_conversion/seed-vc/tools/download_models.py

@@ -0,0 +1,33 @@
+import os
+
+from huggingface_hub import hf_hub_download
+
+
+def check_and_download_files(
+    repo_id: str,
+    local_dir: str,
+    file_list: list[str],
+) -> None:
+    os.makedirs(local_dir, exist_ok=True)
+    for file in file_list:
+        file_path = os.path.join(local_dir, file)
+        if not os.path.exists(file_path):
+            hf_hub_download(
+                repo_id=repo_id,
+                filename=file,
+                local_dir=local_dir,
+            )
+
+
+repo_id = "Plachta/Seed-VC"
+local_dir = "./checkpoints"
+files = [
+    "DiT_step_315000_seed_v2_online_pruned.pth",
+    "README.md",
+    "config_dit_mel_seed_wavenet.yml",
+    "hifigan.yml",
+    "hift.pt",
+    "speech_tokenizer_v1.onnx",
+]
+
+check_and_download_files(repo_id, local_dir, files)