| """Exp 0 KL probe: get top-20 prompt logprobs for a few long SWE prefixes. |
| |
| Sends token-id prompts to /v1/completions (max_tokens=1, prompt_logprobs=20) and |
| stores the top-20 (id, logprob) per position for positions in [START, END). |
| compare_kl.py then computes KL between configs on identical token sequences. |
| """ |
| import argparse |
| import json |
| import time |
| import urllib.request |
| from pathlib import Path |
|
|
| from transformers import AutoTokenizer |
|
|
| ap = argparse.ArgumentParser() |
| ap.add_argument("--out", required=True) |
| ap.add_argument("--n", type=int, default=3) |
| ap.add_argument("--prefix_tokens", type=int, default=24000) |
| ap.add_argument("--start", type=int, default=4000) |
| ap.add_argument("--url", default="http://localhost:8000/v1/completions") |
| a = ap.parse_args() |
|
|
| tok = AutoTokenizer.from_pretrained(Path.home() / "models" / "Qwen3.8-27B") |
| rows = [json.loads(l) for l in open(Path.home() / "bench" / "data" / "swe_kl_50.jsonl")][: a.n] |
| out = [] |
| for r in rows: |
| ids = tok.apply_chat_template(r["messages"], tools=r["tools"], tokenize=True) |
| if not isinstance(ids, list): |
| ids = ids["input_ids"] |
| ids = ids[: a.prefix_tokens] |
| body = {"model": "Qwen/Qwen3.8-27B", "prompt": ids, "max_tokens": 1, "temperature": 0, |
| "prompt_logprobs": 20} |
| t0 = time.time() |
| req = urllib.request.Request(a.url, data=json.dumps(body).encode(), headers={"Content-Type": "application/json"}) |
| resp = json.loads(urllib.request.urlopen(req, timeout=1800).read()) |
| pl = resp["choices"][0]["prompt_logprobs"] |
| pos = [] |
| for i in range(a.start, len(ids)): |
| d = pl[i] or {} |
| top = sorted(((int(k), v["logprob"]) for k, v in d.items()), key=lambda x: -x[1])[:21] |
| pos.append({"t": ids[i], "top": top}) |
| out.append({"id": r["id"], "n_tokens": len(ids), "start": a.start, "positions": pos}) |
| print(f"{r['id']}: {len(ids)} tokens, {time.time() - t0:.1f}s", flush=True) |
| Path(a.out).write_text(json.dumps(out)) |
| print("KL_PROBE_OK", a.out) |
|
|
