radio: read a director script file (was stale on the hub)

kaggle/radio_demo.py

@@ -38,6 +38,10 @@ GAP_S = 0.7
 SR = 44100
 
 SCRIPT_LLM = os.environ.get("SCRIPT_LLM", "Qwen/Qwen2.5-1.5B-Instruct")
+# A file written by the director stage. Set this to skip the in-process LLM:
+# Qwen3.5 needs transformers 5.x, Ming needs 4.46.3, so they cannot share a
+# process and the script has to arrive as a file.
+SCRIPT_FILE = os.environ.get("SCRIPT_FILE", "")
 CAST = {"叙述": "a08", "故事": "a08", "耳语": "a09", "开场": "a05", "收尾": "a08"}
 
 FALLBACK = [
@@ -64,6 +68,16 @@ def patch_fp32() -> None:
         p.write_text(s)
 
 
+def load_script(path: str) -> tuple[list[dict], str]:
+    """Read a script the director stage already validated."""
+    doc = json.loads(Path(path).read_text())
+    rows = doc.get("lines") or doc
+    rows = [r for r in rows if isinstance(r, dict) and r.get("text")]
+    if len(rows) < 1:
+        raise ValueError(f"{path} has no usable lines")
+    return rows, f"director:{doc.get('model', 'file')}"
+
+
 def write_script() -> tuple[list[dict], str]:
     """Ask a small instruct model for the segment; fall back to a fixed script."""
     import torch
@@ -143,7 +157,7 @@ def main() -> None:
     (OUT / "lines").mkdir(parents=True, exist_ok=True)
     torch.manual_seed(SEED)
 
-    plan, source = write_script()
+    plan, source = (load_script(SCRIPT_FILE) if SCRIPT_FILE else write_script())
     lines = cast(plan)
     (OUT / "script.json").write_text(json.dumps({"source": source, "lines": lines},
                                                 ensure_ascii=False, indent=1))