code/set1_blimp.py

"""ACCURACY, not likelihood: does the Δfloor rescue transfer to BLiMP?

The audit's sharpest point is that "recovery is not success" -- a likelihood rescue has not been
shown to transfer to benchmark accuracy. PolyPythia parents are English LMs, so BLiMP is directly
applicable to SET 1's merges. Scoring: sum log p over the sentence (all tokens after the first);
a paradigm item is correct when the grammatical sentence scores higher. Chance = 50%."""
import os, sys, json, time, glob, itertools, argparse, gc
sys.path.insert(0, "/root/compose-audit")
from common import *
from transformers import AutoModelForCausalLM, AutoTokenizer
import pyarrow.parquet as pq

ap = argparse.ArgumentParser()
ap.add_argument("--size", default="14m")
ap.add_argument("--seeds", default="1,2,3,4,5,6,7,8,9")
ap.add_argument("--n_per_paradigm", type=int, default=200)
ap.add_argument("--bs", type=int, default=128)
ap.add_argument("--acts_rows", type=int, default=2048)
ap.add_argument("--tag", default="blimp")
ap.add_argument("--blocks", type=int, default=48)
A = ap.parse_args()
SEEDS = [int(s) for s in A.seeds.split(",")]
OUT = f"/root/compose-audit/results/{A.tag}_{A.size}.jsonl"
DEV = "cuda"
BLIMP = glob.glob("/root/hf_cache_brainalign/hub/datasets--nyu-mll--blimp/snapshots/*/")[0]


def log(*a):
    print(f"[{time.strftime('%H:%M:%S')}]", *a, flush=True)


# reuse SET 1's aligners
import importlib.util
spec = importlib.util.spec_from_file_location("s1", "/root/compose-audit/set1_polypythia.py")

def neox_head_match(sd_a, sd_b, d, nh, nl):
    hd, perms = d // nh, {}
    for L in range(nl):
        qk = f"gpt_neox.layers.{L}.attention.query_key_value.weight"
        de = f"gpt_neox.layers.{L}.attention.dense.weight"
        if qk not in sd_a: continue
        Aq = np.asarray(sd_a[qk], float).reshape(nh, 3 * hd, d)
        Bq = np.asarray(sd_b[qk], float).reshape(nh, 3 * hd, d)
        g = np.einsum("ixy,jxy->ij", Aq, Bq)
        Ad = np.asarray(sd_a[de], float).reshape(d, nh, hd)
        Bd = np.asarray(sd_b[de], float).reshape(d, nh, hd)
        perms[L] = AL._assignment(g + np.einsum("xiy,xjy->ij", Ad, Bd))
    return perms


def neox_apply_head(sd, perms, d, nh):
    hd, out = d // nh, dict(sd)
    for L, h in perms.items():
        qk = f"gpt_neox.layers.{L}.attention.query_key_value.weight"
        qb = f"gpt_neox.layers.{L}.attention.query_key_value.bias"
        de = f"gpt_neox.layers.{L}.attention.dense.weight"
        out[qk] = np.asarray(sd[qk], float).reshape(nh, 3 * hd, d)[h].reshape(3 * d, d)
        if qb in sd: out[qb] = np.asarray(sd[qb], float).reshape(nh, 3 * hd)[h].reshape(3 * d)
        out[de] = np.asarray(sd[de], float).reshape(d, nh, hd)[:, h].reshape(d, d)
    return out


def align_full(sd_a, sd_b, d, aa, ab, nh, nl, method):
    sd, info = AL.align_weights_full(sd_a, sd_b, d, acts_a=aa, acts_b=ab, n_heads=None,
                                     method=method, strict=True, accept_each=True)
    hp = neox_head_match(sd_a, sd, d, nh, nl)
    if hp:
        cand = neox_apply_head(sd, hp, d, nh)
        if AL.block_normalised_distance(sd_a, cand) <= AL.block_normalised_distance(sd_a, sd):
            sd = cand
    return sd


# ------------------------------------------------------------------ BLiMP
def load_blimp(tok, n_per):
    items = []
    for d in sorted(glob.glob(BLIMP + "*/")):
        name = os.path.basename(d.rstrip("/"))
        f = glob.glob(d + "*.parquet")
        if not f: continue
        t = pq.read_table(f[0]).to_pydict()
        good, bad = t["sentence_good"][:n_per], t["sentence_bad"][:n_per]
        items.append((name, good, bad))
    return items


def encode(tok, sents, maxlen=48):
    enc = tok(sents, return_tensors="pt", padding=True, truncation=True, max_length=maxlen)
    return enc["input_ids"], enc["attention_mask"]


@torch.no_grad()
def score(model, ids, am, dev, bs=128):
    out = []
    for i in range(0, ids.shape[0], bs):
        x, m = ids[i:i + bs].to(dev), am[i:i + bs].to(dev)
        lp = torch.log_softmax(model(x, attention_mask=m).logits.float()[:, :-1], -1)
        tgt = x[:, 1:]
        tokl = lp.gather(-1, tgt.unsqueeze(-1)).squeeze(-1) * m[:, 1:].float()
        out.append(tokl.sum(1).cpu())
    return torch.cat(out).numpy()


tok = AutoTokenizer.from_pretrained(f"EleutherAI/pythia-{A.size}")
if tok.pad_token is None: tok.pad_token = tok.eos_token
PARA = load_blimp(tok, A.n_per_paradigm)
log(f"BLiMP paradigms={len(PARA)} items/paradigm={len(PARA[0][1])}")
ENC = [(n, encode(tok, g), encode(tok, b)) for n, g, b in PARA]

lines = flores_lines("eng_Latn")
blocks = make_blocks(tok, lines, block=512, max_blocks=A.blocks)
shell = AutoModelForCausalLM.from_pretrained(f"EleutherAI/pythia-{A.size}-seed{SEEDS[0]}",
                                             dtype=torch.float32).to(DEV).eval()
cfg = shell.config
D, NH, NL = cfg.hidden_size, cfg.num_attention_heads, cfg.num_hidden_layers


def blimp_acc(sd):
    sd_load(shell, sd, DEV)
    per, tot, cor = {}, 0, 0
    for name, (gi, gm), (bi, bm) in ENC:
        sg = score(shell, gi, gm, DEV, bs=A.bs)
        sb = score(shell, bi, bm, DEV, bs=A.bs)
        c = int((sg > sb).sum()); per[name] = c / len(sg); cor += c; tot += len(sg)
    return cor / tot, per


SDS, ACTS, PACC = {}, {}, {}
for s in SEEDS:
    m = AutoModelForCausalLM.from_pretrained(f"EleutherAI/pythia-{A.size}-seed{s}", dtype=torch.float32).to(DEV).eval()
    SDS[s] = sd_np(m); ACTS[s] = capture_acts(m, blocks, DEV, n_rows=A.acts_rows, bs=16)
    del m; torch.cuda.empty_cache()
    a, _ = blimp_acc(SDS[s]); PACC[s] = a
    log(f"  seed{s} BLiMP={a:.4f}")

done = set()
if os.path.exists(OUT):
    for l in open(OUT):
        try: done.add(tuple(json.loads(l)["pair"]))
        except Exception: pass
fh = open(OUT, "a")
for a, b in itertools.combinations(SEEDS, 2):
    if (a, b) in done: continue
    t0 = time.time()
    sa, sb = SDS[a], SDS[b]
    sbp = align_full(sa, sb, D, ACTS[a], ACTS[b], NH, NL, "permutation")
    sbo = align_full(sa, sb, D, ACTS[a], ACTS[b], NH, NL, "orthogonal")
    rungs = {"M0_naive_avg": MG.average([sa, sb]), "M1_perm_avg": MG.average([sa, sbp]),
             "M1_orth_avg": MG.average([sa, sbo])}
    res = {}
    for k, sd in rungs.items():
        acc, per = blimp_acc(sd)
        res[k] = {"blimp_acc": acc, "per_paradigm": per}
    r = {"set": "set1_blimp", "size": A.size, "pair": [a, b],
         "metric": "BLiMP accuracy (chance=0.5) -- ACCURACY, not likelihood",
         "n_per_paradigm": A.n_per_paradigm, "n_paradigms": len(ENC),
         "parent_acc": {"a": PACC[a], "b": PACC[b]}, "ceiling": max(PACC[a], PACC[b]),
         "rungs": {k: {"blimp_acc": v["blimp_acc"],
                       "delta_vs_best_parent": v["blimp_acc"] - max(PACC[a], PACC[b])} for k, v in res.items()},
         "per_paradigm": {k: v["per_paradigm"] for k, v in res.items()},
         "secs": time.time() - t0}
    fh.write(json.dumps(r) + "\n"); fh.flush()
    log(f"pair {a},{b} ceil={r['ceiling']:.4f} M0={res['M0_naive_avg']['blimp_acc']:.4f} "
        f"M1p={res['M1_perm_avg']['blimp_acc']:.4f} M1o={res['M1_orth_avg']['blimp_acc']:.4f} ({r['secs']:.0f}s)")
    del rungs, sbp, sbo; gc.collect()
fh.close()
log("DONE blimp", A.size)