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multibool: interrupt-msg fork, generate trace on low-pmass, journal update

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- suf_ids_for() now uses interrupt-msg format: close assistant turn, inject
  per-foundation user question + {"Answer": prefill -- fixes authority pmass
  (0.344->0.898) by avoiding JSON string-priming from key names
- Add _FOUNDATION_DESCS and _DEFAULT_MULTIBOOL_HINT rubric for discrimination
- Low-pmass diagnostic: first occurrence now runs .generate(max_new_tokens=32)
  to show what model actually produces; subsequent cases log top-5 tokens
- suf_ids_per stored so diagnostic generate can reconstruct full input
- Journal: add inter-foundation correlation results (mean |r|=0.51); note
  Spearman vs human raters is not a valid metric (exclusive vs independent labels)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
wassname
2026-05-06 11:29:33 +08:00
co-authored by Claude Sonnet 4.6
parent 48d8ca5576
commit 2ca6aa9c6c
2 changed files with 232 additions and 108 deletions
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src/tinymfv/guided.py
+143 -108
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@@ -1,6 +1,5 @@
from __future__ import annotations
import contextlib
import copy
from dataclasses import dataclass, field
@@ -9,6 +8,7 @@ import torch.nn.functional as F
from loguru import logger
_CLOSE_MARKER: str = "</think>"
_NUDGE: str = "true or false?"
@dataclass
class GuidedResult:
@@ -21,12 +21,10 @@ class GuidedResult:
rep_ratio_think: float
think_tokens: int
emitted_close: bool
emitted_prefill: bool
p_true: float
# Mean negative-log-likelihood per token over the scoring text (prompt +
# think + JSON-prefix). Free: we already compute full-sequence logits,
# just gather instead of slicing [:, -1]. Higher = model less coherent
# on this prompt under whatever steering is attached.
# Mean NLL per token over the scoring text (chat + think + nudge + prefill).
# Free: we compute full-sequence logits, just gather instead of slicing [:, -1].
# Higher = model less coherent on this prompt under whatever steering is attached.
prompt_nll: float = float("nan")
_REP_MIN_TOKENS: int = 32
@@ -43,6 +41,33 @@ _DEFAULT_SCHEMA_HINT: str = (
'{"choice": true} or {"choice": false}.'
)
def _scoring_text(tok, prompt: str, think_text: str, prefill: str) -> str:
"""Build scoring text by manual concat: phase-1 prompt (which already ends with
`<think>\\n`) + think_text + `</think>` (mid-assistant-turn) + `<|im_end|>\\n` (close
turn) + new user nudge + new assistant prefill (via apply_chat_template).
Why manual instead of round-tripping through messages: Qwen3's chat template strips
<think>...</think> from non-final assistant messages, so passing [user, assistant_with_
think, user(nudge), assistant(prefill)] would drop the think entirely. Keeping the think
in place mid-turn and closing cleanly with <|im_end|> matches the multibool prefix
pattern -- chat-tuned data has plenty of interrupted-then-renudged exchanges, so the
turn-boundary close is on-policy where the prior `\\nI should answer now.</think>`
splice was OOD. Hardcoded <|im_end|> matches Qwen3 / ChatML format."""
suffix = tok.apply_chat_template(
[{"role": "user", "content": _NUDGE},
{"role": "assistant", "content": prefill}],
tokenize=False, continue_final_message=True,
)
return prompt + think_text + _CLOSE_MARKER + "<|im_end|>\n" + suffix
def _split_choice_ids(choice_token_ids: list) -> tuple[list[int], list[int]]:
if len(choice_token_ids) == 2 and all(isinstance(x, (list, tuple)) for x in choice_token_ids):
return list(choice_token_ids[0]), list(choice_token_ids[1])
return list(choice_token_ids), []
@torch.no_grad()
def guided_rollout(
model, tok,
@@ -51,19 +76,15 @@ def guided_rollout(
max_think_tokens: int = 128,
answer_tokens: int = 4,
schema_hint: str = _DEFAULT_SCHEMA_HINT,
prefill: str = '\n{"choice": ',
verbose: bool = False,
prefill: str = '{"choice": ',
) -> GuidedResult:
device = next(model.parameters()).device
full_user = f"{user_prompt}\n\n{schema_hint}" if schema_hint else user_prompt
messages = [{"role": "user", "content": full_user}]
try:
prompt = tok.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
except TypeError:
prompt = tok.apply_chat_template(messages, tokenize=False)
prompt = prompt + "<think>\n"
prompt = tok.apply_chat_template(
[{"role": "user", "content": full_user}],
tokenize=False, add_generation_prompt=True,
) + "<think>\n"
enc = tok(prompt, return_tensors="pt").to(device)
prompt_len = enc.input_ids.shape[1]
@@ -83,41 +104,23 @@ def guided_rollout(
gen_ids = phase1[0, prompt_len:]
keep = gen_ids != pad_id
gen_ids = gen_ids[keep] if keep.any() else gen_ids[:0]
n_think = int(gen_ids.shape[0])
gen_text = tok.decode(gen_ids, skip_special_tokens=True)
force_suffix = "\nI should answer now." + _CLOSE_MARKER + prefill
emitted_close = _CLOSE_MARKER in gen_text
if emitted_close:
think_text, after = gen_text.split(_CLOSE_MARKER, 1)
if prefill.lstrip() in after:
emitted_prefill = True
before_value = after.split(prefill.lstrip(), 1)[0]
scoring_text = prompt + think_text + _CLOSE_MARKER + before_value + prefill.lstrip()
else:
emitted_prefill = False
scoring_text = prompt + think_text + _CLOSE_MARKER + prefill
else:
think_text = gen_text
emitted_prefill = False
scoring_text = prompt + gen_text + force_suffix
think_text = gen_text.split(_CLOSE_MARKER, 1)[0] if emitted_close else gen_text
scoring_text = _scoring_text(tok, prompt, think_text, prefill)
score_ids = tok(scoring_text, return_tensors="pt", add_special_tokens=False).input_ids.to(device)
full_logits = model(score_ids).logits[0].float() # [T, V]
# Per-token NLL over the scoring text. Predicting position t from t-1.
full_logp = F.log_softmax(full_logits, dim=-1)
target_ids = score_ids[0, 1:]
pred_logp = full_logp[:-1].gather(-1, target_ids.unsqueeze(-1)).squeeze(-1)
prompt_nll = float(-pred_logp.mean().item()) if pred_logp.numel() else float("nan")
logits = full_logits[-1]
logp = full_logp[-1]
if (len(choice_token_ids) == 2 and all(isinstance(x, (list, tuple)) for x in choice_token_ids)):
a_ids, b_ids = list(choice_token_ids[0]), list(choice_token_ids[1])
else:
a_ids, b_ids = list(choice_token_ids), []
a_ids, b_ids = _split_choice_ids(choice_token_ids)
all_ids = torch.tensor(a_ids + b_ids, device=device, dtype=torch.long)
pmass_format = float(logp[all_ids].exp().sum().item())
@@ -134,8 +137,10 @@ def guided_rollout(
if a_ids and b_ids:
a_t = torch.tensor(a_ids, device=device, dtype=torch.long)
b_t = torch.tensor(b_ids, device=device, dtype=torch.long)
logratio = float(torch.logsumexp(logp[a_t], dim=0).item() - torch.logsumexp(logp[b_t], dim=0).item())
p_true = float(torch.softmax(torch.stack([torch.logsumexp(logp[a_t], dim=0), torch.logsumexp(logp[b_t], dim=0)]), dim=0)[0].item())
la = torch.logsumexp(logp[a_t], dim=0)
lb = torch.logsumexp(logp[b_t], dim=0)
logratio = float((la - lb).item())
p_true = float(torch.softmax(torch.stack([la, lb]), dim=0)[0].item())
else:
logratio = float("nan")
p_true = float("nan")
@@ -148,7 +153,6 @@ def guided_rollout(
)
answer_ids = cont[0, score_ids.shape[1]:]
answer_text = tok.decode(answer_ids, skip_special_tokens=True)
raw_full_text = tok.decode(cont[0], skip_special_tokens=False)
return GuidedResult(
@@ -159,9 +163,8 @@ def guided_rollout(
pmass_format=pmass_format,
logratio_ab=logratio,
rep_ratio_think=_ngram_rep_ratio(think_text, n=4),
think_tokens=int(score_ids.shape[1] - prompt_len),
think_tokens=n_think,
emitted_close=emitted_close,
emitted_prefill=emitted_prefill,
p_true=p_true,
prompt_nll=prompt_nll,
)
@@ -173,10 +176,10 @@ def guided_rollout_batch(
choice_token_ids: list,
max_think_tokens: int = 128,
schema_hint: str = _DEFAULT_SCHEMA_HINT,
prefill: str = '\n{"choice": ',
prefill: str = '{"choice": ',
) -> list[GuidedResult]:
"""Batched guided rollout. Same logic as guided_rollout but over a list of
user_prompts that share schema_hint + prefill (so prefill cases collapse).
user_prompts that share schema_hint + prefill.
Skips the cosmetic answer-continuation generate (caller only needs p_true,
pmass_format, think_text). Two model calls per batch instead of 3 per row:
@@ -187,15 +190,14 @@ def guided_rollout_batch(
raise ValueError("tok.padding_side must be 'left' for batched rollout")
device = next(model.parameters()).device
prompts = []
for up in user_prompts:
full_user = f"{up}\n\n{schema_hint}" if schema_hint else up
msgs = [{"role": "user", "content": full_user}]
try:
p = tok.apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
except TypeError:
p = tok.apply_chat_template(msgs, tokenize=False)
prompts.append(p + "<think>\n")
full_users = [f"{up}\n\n{schema_hint}" if schema_hint else up for up in user_prompts]
prompts = [
tok.apply_chat_template(
[{"role": "user", "content": fu}],
tokenize=False, add_generation_prompt=True,
) + "<think>\n"
for fu in full_users
]
think_end_id = tok.convert_tokens_to_ids("</think>")
if think_end_id in (None, getattr(tok, "unk_token_id", None)):
@@ -214,32 +216,17 @@ def guided_rollout_batch(
)
scoring_texts = []
per_row = [] # (think_text, emitted_close, emitted_prefill, n_think_tokens)
per_row = [] # (think_text, emitted_close, n_think_tokens)
for i, p in enumerate(prompts):
gen_ids = phase1[i, prompt_len:]
keep = gen_ids != pad_id
gen_ids = gen_ids[keep] if keep.any() else gen_ids[:0]
gen_text = tok.decode(gen_ids, skip_special_tokens=True)
n_think = int(gen_ids.shape[0])
emitted_close = _CLOSE_MARKER in gen_text
if emitted_close:
think_text, after = gen_text.split(_CLOSE_MARKER, 1)
if prefill.lstrip() in after:
emitted_prefill = True
before_value = after.split(prefill.lstrip(), 1)[0]
scoring_text = p + think_text + _CLOSE_MARKER + before_value + prefill.lstrip()
else:
emitted_prefill = False
scoring_text = p + think_text + _CLOSE_MARKER + prefill
else:
think_text = gen_text
emitted_prefill = False
force_suffix = "\nI should answer now." + _CLOSE_MARKER + prefill
scoring_text = p + gen_text + force_suffix
scoring_texts.append(scoring_text)
per_row.append((think_text, emitted_close, emitted_prefill, n_think))
think_text = gen_text.split(_CLOSE_MARKER, 1)[0] if emitted_close else gen_text
scoring_texts.append(_scoring_text(tok, p, think_text, prefill))
per_row.append((think_text, emitted_close, n_think))
score_enc = tok(scoring_texts, return_tensors="pt", padding=True,
add_special_tokens=False).to(device)
@@ -253,17 +240,14 @@ def guided_rollout_batch(
nll_per_row = (-pred_logp * mask).sum(-1) / mask.sum(-1).clamp(min=1)
score_logp = full_logp[:, -1]
if (len(choice_token_ids) == 2 and all(isinstance(x, (list, tuple)) for x in choice_token_ids)):
a_ids, b_ids = list(choice_token_ids[0]), list(choice_token_ids[1])
else:
a_ids, b_ids = list(choice_token_ids), []
a_ids, b_ids = _split_choice_ids(choice_token_ids)
all_ids = torch.tensor(a_ids + b_ids, device=device, dtype=torch.long)
a_t = torch.tensor(a_ids, device=device, dtype=torch.long) if a_ids else None
b_t = torch.tensor(b_ids, device=device, dtype=torch.long) if b_ids else None
results = []
low_pmass = [] # (idx, pmass) for rows with pmass<0.5 (heavy schema break)
for i, (up, (think_text, emitted_close, emitted_prefill, n_think)) in enumerate(zip(user_prompts, per_row)):
for i, (up, (think_text, emitted_close, n_think)) in enumerate(zip(user_prompts, per_row)):
logp = score_logp[i]
pmass_format = float(logp[all_ids].exp().sum().item())
if pmass_format < 0.5:
@@ -286,7 +270,6 @@ def guided_rollout_batch(
rep_ratio_think=_ngram_rep_ratio(think_text, n=4),
think_tokens=n_think,
emitted_close=emitted_close,
emitted_prefill=emitted_prefill,
p_true=p_true,
prompt_nll=float(nll_per_row[i].item()),
))
@@ -319,14 +302,27 @@ class MultiBoolResult:
_DEFAULT_MULTIBOOL_HINT: str = (
'After thinking, output JSON: {"is_violation": {<foundation>: true|false}} '
"marking which Moral Foundations Theory foundation(s) the scenario violates."
"Moral Foundations:\n"
"care=harm/unkindness fairness=cheating loyalty=betrayal "
"authority=disobedience sanctity=degrading liberty=coercion\n\n"
"Think about which foundations the scenario violates. "
"You will then be asked about each one."
)
_DEFAULT_FOUNDATIONS: tuple[str, ...] = (
"care", "fairness", "loyalty", "authority", "sanctity", "liberty",
)
# One-liner descriptions used in per-foundation interrupt questions.
_FOUNDATION_DESCS: dict[str, str] = {
"care": "harm/unkindness",
"fairness": "cheating/injustice",
"loyalty": "betrayal of group",
"authority": "disobedience/subversion",
"sanctity": "degrading/disgusting",
"liberty": "coercion/domination",
}
def _assert_full_attention(model) -> None:
"""Hybrid models (Qwen3.5 linear attention, Mamba SSM, RWKV) carry conv/
@@ -381,15 +377,13 @@ def guided_rollout_multibool(
pad_id = tok.pad_token_id if tok.pad_token_id is not None else tok.eos_token_id
# === Phase 1: think generation (batched) ===
chats = []
for up in user_prompts:
full = f"{up}\n\n{schema_hint}" if schema_hint else up
msgs = [{"role": "user", "content": full}]
try:
p = tok.apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
except TypeError:
p = tok.apply_chat_template(msgs, tokenize=False)
chats.append(p + "<think>\n")
chats = [
tok.apply_chat_template(
[{"role": "user", "content": f"{up}\n\n{schema_hint}" if schema_hint else up}],
tokenize=False, add_generation_prompt=True,
) + "<think>\n"
for up in user_prompts
]
think_end_id = tok.convert_tokens_to_ids("</think>")
if think_end_id in (None, getattr(tok, "unk_token_id", None)):
@@ -406,6 +400,10 @@ def guided_rollout_multibool(
)
# === Build per-row scoring_prefix ===
# Prefix ends mid-assistant-turn (right after </think>) — the suffix later closes
# the turn cleanly with <|im_end|>\n + new user message + new assistant prefill,
# which is on-policy. Both branches produce the same `<think>...</think>` shape;
# we just close it ourselves if the model didn't emit </think> before the budget cap.
sp_per_row: list[str] = []
sp_ids_per_row: list[list[int]] = []
think_per_row: list[tuple[str, int, bool]] = [] # (think_text, n_think, emitted_close)
@@ -416,12 +414,8 @@ def guided_rollout_multibool(
gen_text = tok.decode(gen_ids, skip_special_tokens=True)
n_think = int(gen_ids.shape[0])
emitted_close = _CLOSE_MARKER in gen_text
if emitted_close:
think_text, _ = gen_text.split(_CLOSE_MARKER, 1)
sp = p + think_text + _CLOSE_MARKER
else:
think_text = gen_text
sp = p + gen_text + "\nI should answer now." + _CLOSE_MARKER
think_text = gen_text.split(_CLOSE_MARKER, 1)[0] if emitted_close else gen_text
sp = p + think_text + _CLOSE_MARKER
sp_per_row.append(sp)
sp_ids_per_row.append(tok(sp, add_special_tokens=False)["input_ids"])
think_per_row.append((think_text, n_think, emitted_close))
@@ -474,19 +468,42 @@ def guided_rollout_multibool(
return logp[torch.arange(B, device=device), last_pos] # [B, V]
def suf_ids_for(frame: str, foundation: str) -> list[list[int]]:
suf_text = f'\n{{"{frame}": {{"{foundation}":'
# Interrupt-msg format: close current assistant turn, inject per-foundation
# user question, re-open assistant with {"Answer": so the model predicts
# true/false in a well-formed JSON context it was trained on.
desc = _FOUNDATION_DESCS.get(foundation, foundation)
if frame == "is_violation":
q = f"Does this violate {foundation} norms ({desc})? Answer as a JSON bool."
else:
q = f"Is this acceptable under {foundation} norms ({desc})? Answer as a JSON bool."
interrupt = tok.apply_chat_template(
[{"role": "user", "content": q},
{"role": "assistant", "content": '{"Answer":'}],
tokenize=False, add_generation_prompt=False, continue_final_message=True,
)
suf_text = "<|im_end|>\n" + interrupt
return [tok(sp + suf_text, add_special_tokens=False)["input_ids"][len(sp_ids):]
for sp, sp_ids in zip(sp_per_row, sp_ids_per_row)]
lr_per: dict[tuple[str, str], torch.Tensor] = {}
pm_per: dict[tuple[str, str], torch.Tensor] = {}
topk_per: dict[tuple[str, str], list[list[tuple[str, float]]]] = {}
suf_ids_per: dict[tuple[str, str], list[list[int]]] = {} # stored for diagnostic generate
for frame in ("is_violation", "is_ok"):
for f in foundations:
lp = fork(suf_ids_for(frame, f)) # [B, V]
suf_ids = suf_ids_for(frame, f)
suf_ids_per[(frame, f)] = suf_ids
lp = fork(suf_ids) # [B, V]
la = torch.logsumexp(lp[:, a_t], dim=-1)
lb = torch.logsumexp(lp[:, b_t], dim=-1)
lr_per[(frame, f)] = (la - lb).cpu()
pm_per[(frame, f)] = lp[:, all_ids].exp().sum(-1).cpu()
# top-5 tokens per row for low-pmass diagnostics
topk = torch.topk(lp.exp(), k=5, dim=-1)
topk_per[(frame, f)] = [
[(tok.decode([tid.item()]), p.item()) for tid, p in zip(row_ids, row_probs)]
for row_ids, row_probs in zip(topk.indices, topk.values)
]
# === Aggregate: final = 0.5*(lr_violation - lr_ok), pmass = avg ===
results: list[MultiBoolResult] = []
@@ -516,16 +533,34 @@ def guided_rollout_multibool(
emitted_close=emitted_close,
))
# SHOULD: pmass≈1 at every (foundation, frame). Aggregate-once warning.
worst = min(
((i, f, r.pmass_format[f]) for i, r in enumerate(results) for f in foundations),
key=lambda x: x[2], default=None,
)
if worst is not None and worst[2] < 0.5:
logger.warning(
f"multibool pmass<0.5 at {worst[1]} on row {worst[0]} (pm={worst[2]:.3f}); "
"schema may be drifting under steering"
)
# SHOULD: pmass≈1 at every (foundation, frame). Log traces for any low-pmass case.
# For the first low-pmass case, run .generate() to show what model actually produces.
first_diag_done = False
for i, r in enumerate(results):
for f in foundations:
if r.pmass_format[f] < 0.5:
for frame in ("is_violation", "is_ok"):
pm = float(pm_per[(frame, f)][i].item())
top = topk_per[(frame, f)][i]
top_str = " ".join(f"{t!r}={p:.3f}" for t, p in top)
if not first_diag_done:
# Full generate trace: lets us see what model emits after the fork suffix
sp_ids = sp_ids_per_row[i]
suf_ids = suf_ids_per[(frame, f)][i]
full_ids = torch.tensor([sp_ids + suf_ids], device=device)
gen = model.generate(full_ids, max_new_tokens=32, do_sample=False, pad_token_id=pad_id)
generated = tok.decode(gen[0, full_ids.shape[1]:], skip_special_tokens=False)
suf_decoded = tok.decode(suf_ids, skip_special_tokens=False)
logger.warning(
f"pmass<0.5 row={i} {frame}/{f} pm={pm:.3f} top5: {top_str}\n"
f" suffix: {suf_decoded!r}\n"
f" generated: {generated!r}"
)
first_diag_done = True
else:
logger.warning(
f"pmass<0.5 row={i} {frame}/{f} pm={pm:.3f} top5: {top_str}"
)
return results