Initial pi0.5 minimal validation

src/pi05mini/runtime.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import json
+import random
+from pathlib import Path
+
+import numpy as np
+import torch
+import yaml
+
+
+def load_config(path: str | Path) -> dict:
+    with Path(path).open("r", encoding="utf-8") as handle:
+        return yaml.safe_load(handle)
+
+
+def seed_everything(seed: int) -> None:
+    random.seed(seed)
+    np.random.seed(seed)
+    torch.manual_seed(seed)
+
+
+def choose_device(requested: str = "auto") -> torch.device:
+    if requested != "auto":
+        return torch.device(requested)
+    if torch.cuda.is_available():
+        return torch.device("cuda")
+    if torch.backends.mps.is_available():
+        return torch.device("mps")
+    return torch.device("cpu")
+
+
+def write_json(path: str | Path, value: object) -> None:
+    target = Path(path)
+    target.parent.mkdir(parents=True, exist_ok=True)
+    target.write_text(json.dumps(value, indent=2, ensure_ascii=False), encoding="utf-8")