#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Supra-μBench — evaluation suite for very small base language models (<100M parameters). Usage: python evaluate.py --model_dir path/to/model [--batch_size 16] [--device auto] [--dtype float32] [--max_length 512] [--tasks 1a,4b] [--output results.json] [--show_levels] [--trust_remote_code] [--list_tasks] All tasks are scored purely via log-likelihood (no generation). """ import argparse import importlib.util import json import math import sys import time from collections import defaultdict from pathlib import Path import torch import torch.nn.functional as F from transformers import AutoConfig, AutoModelForCausalLM, AutoTokenizer from tasks import BENCHMARK_NAME, VERSION, DOMAINS, DOMAIN_WEIGHTS, build_tasks DTYPES = {"float32": torch.float32, "float16": torch.float16, "bfloat16": torch.bfloat16} # ---------------------------------------------------------------------------- # Model wrapper # ---------------------------------------------------------------------------- class _LogitsOut: def __init__(self, logits): self.logits = logits class _CausalAdapter(torch.nn.Module): """Make a custom module look like a causal LM: forward(input_ids=...).logits.""" def __init__(self, inner, context): super().__init__() self.inner = inner self.config = type("Cfg", (), { "max_position_embeddings": context, "n_positions": context, "n_ctx": context, "seq_length": context, })() def forward(self, input_ids=None, attention_mask=None, **kwargs): ids = input_ids if input_ids is not None else kwargs.get("ids") try: out = self.inner(input_ids=ids, attention_mask=attention_mask) except Exception: try: out = self.inner(ids) except Exception: out = self.inner(ids=ids) if torch.is_tensor(out): logits = out elif isinstance(out, dict): logits = out.get("logits", out.get("logit")) if not torch.is_tensor(logits): raise TypeError(f"forward dict has no logits/logit tensor, keys={list(out)}") else: logits = getattr(out, "logits", None) if not torch.is_tensor(logits): raise TypeError(f"unsupported forward return: {type(out)}") return _LogitsOut(logits) def _snapshot(model_dir): path = Path(model_dir) if path.is_dir(): return path from huggingface_hub import snapshot_download return Path(snapshot_download(model_dir)) def _import_py(repo, filename): path = Path(repo) / filename spec = importlib.util.spec_from_file_location(f"_supra_{path.stem}", path) mod = importlib.util.module_from_spec(spec) sys.modules[spec.name] = mod # dataclasses looks the class up in sys.modules during class body sys.path.insert(0, str(repo)) try: spec.loader.exec_module(mod) except Exception: sys.modules.pop(spec.name, None) raise finally: sys.path.pop(0) return mod def _load_state(model, repo): names = ("model.safetensors", "pytorch_model.bin", "model.bin", "model.pt", "model.pth") weight = next((Path(repo) / n for n in names if (Path(repo) / n).is_file()), None) if weight is None: cands = [p for p in Path(repo).iterdir() if p.suffix in {".safetensors", ".bin", ".pt", ".pth"} and "optim" not in p.name and "sched" not in p.name] if len(cands) != 1: raise FileNotFoundError(f"No unique weight file in {repo}: {cands}") weight = cands[0] if weight.suffix == ".safetensors": from safetensors.torch import load_file state = load_file(str(weight)) else: state = torch.load(weight, map_location="cpu") if isinstance(state, dict): for key in ("state_dict", "model", "module"): if key in state and isinstance(state[key], dict): state = state[key] break # Strip a wrapper prefix only when every key has it (may be nested). for prefix in ("module.", "_orig_mod.", "model."): while state and all(k.startswith(prefix) for k in state): state = {k[len(prefix):]: v for k, v in state.items()} missing, unexpected = model.load_state_dict(state, strict=False) if missing or unexpected: print(f" weight load: missing={len(missing)} unexpected={len(unexpected)} (kept)") return model def _load_tokenizer(repo, trust_remote_code): repo = Path(repo) try: return AutoTokenizer.from_pretrained(repo, trust_remote_code=trust_remote_code) except Exception as exc: tok_json = repo / "tokenizer.json" if tok_json.is_file(): from tokenizers import Tokenizer from transformers import PreTrainedTokenizerFast return PreTrainedTokenizerFast(tokenizer_object=Tokenizer.from_file(str(tok_json))) spm = repo / "tokenizer.model" if spm.is_file(): from transformers import LlamaTokenizer return LlamaTokenizer(vocab_file=str(spm), legacy=False) vocab, merges = repo / "vocab.json", repo / "merges.txt" if vocab.is_file() and merges.is_file(): from transformers import GPT2TokenizerFast return GPT2TokenizerFast(vocab_file=str(vocab), merges_file=str(merges)) raise SystemExit( f"No usable tokenizer in {repo} ({exc}). " "Need tokenizer.json, tokenizer.model, or vocab.json+merges.txt." ) from exc def _load_custom_repo(model_dir, dtype, trust_remote_code): repo = _snapshot(model_dir) cfg = json.loads((repo / "config.json").read_text(encoding="utf-8")) if (repo / "model.py").is_file(): mod = _import_py(repo, "model.py") if hasattr(mod, "WorkspaceConfig") and hasattr(mod, "RecurrentWorkspace"): fields = {f.name for f in mod.WorkspaceConfig.__dataclass_fields__.values()} kwargs = {k: v for k, v in cfg.items() if k in fields} inner = mod.RecurrentWorkspace(mod.WorkspaceConfig(**kwargs)) context = int(getattr(inner.cfg, "context", cfg.get("context", 512))) _load_state(inner, repo) tok = _load_tokenizer(repo, trust_remote_code) eos = cfg.get("eos_id", cfg.get("eos_token_id")) if tok.eos_token_id is None and eos is not None: tok.eos_token_id = int(eos) if tok.pad_token_id is None and tok.eos_token_id is not None: tok.pad_token_id = tok.eos_token_id return tok, _CausalAdapter(inner, context) for path in sorted(repo.glob("modeling_*.py")): mod = _import_py(repo, path.name) for obj in vars(mod).values(): if isinstance(obj, type) and hasattr(obj, "from_pretrained"): model = obj.from_pretrained(repo, torch_dtype=dtype, trust_remote_code=True) return _load_tokenizer(repo, trust_remote_code), model raise ValueError( f"{model_dir} is not a Transformers model (no model_type) and has no loadable " "model.py (WorkspaceConfig/RecurrentWorkspace) or modeling_*.py." ) def load_causal_lm(model_dir, dtype, trust_remote_code): try: AutoConfig.from_pretrained(model_dir, trust_remote_code=trust_remote_code) tok = AutoTokenizer.from_pretrained(model_dir, trust_remote_code=trust_remote_code) model = AutoModelForCausalLM.from_pretrained( model_dir, torch_dtype=dtype, trust_remote_code=trust_remote_code ) return tok, model except Exception as exc: text = str(exc) custom = "model_type" in text or "Unrecognized model" in text or "trust_remote_code" in text if not trust_remote_code or not custom: raise print(f" standard HF load failed ({exc.__class__.__name__}). Loading custom repo code ...") return _load_custom_repo(model_dir, dtype, trust_remote_code) class LMScorer: def __init__(self, model_dir, device, dtype, max_length, batch_size, trust_remote_code=False): self.tokenizer, self.model = load_causal_lm(model_dir, dtype, trust_remote_code) try: self.model.to(device=device, dtype=dtype) except Exception as exc: print(f" model.to(dtype=...) failed ({exc.__class__.__name__}); casting floating parameters only") self.model.to(device) with torch.no_grad(): for p in self.model.parameters(): if p.is_floating_point() and p.dtype != dtype: p.data = p.data.to(dtype=dtype) self.model.eval() self.device = device self.batch_size = batch_size # Every sequence starts with a prefix token (BOS, or EOS as fallback, like lm-eval). prefix = self.tokenizer.bos_token_id if prefix is None: prefix = self.tokenizer.eos_token_id if prefix is None: raise ValueError("Tokenizer has neither a BOS nor an EOS token; cannot build a start prefix.") self.prefix_id = prefix model_max = None for attr in ("max_position_embeddings", "n_positions", "n_ctx", "seq_length"): v = getattr(self.model.config, attr, None) if isinstance(v, int) and v > 0: model_max = v break self.max_length = min(max_length, model_max) if model_max else max_length self.n_params = sum(p.numel() for p in self.model.parameters()) self._cache = {} # -- tokenization --------------------------------------------------------- def _encode(self, text): if not text: return [] return self.tokenizer.encode(text, add_special_tokens=False) @staticmethod def _split_ws(context, continuation): """Move trailing whitespace of the context to the continuation (lm-eval convention).""" n = len(context) - len(context.rstrip()) if n > 0: continuation = context[-n:] + continuation context = context[:-n] return context, continuation def _prepare(self, context, continuation): context, continuation = self._split_ws(context, continuation) if context: whole = self._encode(context + continuation) ctx = self._encode(context) if whole[: len(ctx)] == ctx and len(whole) > len(ctx): cont = whole[len(ctx):] else: # tokenizer merged across the boundary -> fallback cont = self._encode(continuation) else: ctx, cont = [], self._encode(continuation) if not cont: raise ValueError(f"Empty continuation for context {context!r}") full = [self.prefix_id] + ctx + cont if len(full) - 1 > self.max_length: if len(cont) >= self.max_length: raise ValueError("Continuation is longer than max_length.") full = full[-(self.max_length + 1):] # left-truncate the context return full, len(cont) # -- scoring --------------------------------------------------------------- @torch.inference_mode() def loglikelihood(self, requests): """requests: list of (context, continuation) -> list of summed log-probs (nats).""" unique = {} for i, req in enumerate(requests): unique.setdefault(req, []).append(i) keys = [k for k in unique if k not in self._cache] prepared = [self._prepare(c, x) for c, x in keys] order = sorted(range(len(keys)), key=lambda j: -len(prepared[j][0])) for b in range(0, len(order), self.batch_size): idx = order[b: b + self.batch_size] inputs = [prepared[j][0][:-1] for j in idx] T = max(len(x) for x in inputs) input_ids = torch.full((len(idx), T), self.prefix_id, dtype=torch.long) attn = torch.zeros((len(idx), T), dtype=torch.long) for r, x in enumerate(inputs): input_ids[r, : len(x)] = torch.tensor(x, dtype=torch.long) attn[r, : len(x)] = 1 def _store(row_logits, j): full, n_cont = prepared[j] L = len(full) - 1 lp = F.log_softmax(row_logits[L - n_cont: L].float(), dim=-1) tgt = torch.tensor(full[-n_cont:], device=lp.device).unsqueeze(1) self._cache[keys[j]] = lp.gather(1, tgt).sum().item() try: logits = self.model(input_ids=input_ids.to(self.device), attention_mask=attn.to(self.device)).logits for r, j in enumerate(idx): _store(logits[r], j) except Exception as exc: print(f" batch forward failed ({exc.__class__.__name__}); retrying one sequence at a time") for r, j in enumerate(idx): one = torch.tensor([inputs[r]], device=self.device) _store(self.model(input_ids=one).logits[0], j) results = [None] * len(requests) for req, idxs in unique.items(): for i in idxs: results[i] = self._cache[req] return results @torch.inference_mode() def rolling_loglikelihood(self, text): """Sliding-window log-likelihood of a full text (nats), stride = max_length / 2.""" seq = [self.prefix_id] + self._encode(text) L = self.max_length stride = max(1, L // 2) total, s = 0.0, 1 while s < len(seq): e = min(s + stride, len(seq)) start = max(0, e - L) inp = torch.tensor([seq[start:e]], device=self.device) logits = self.model(input_ids=inp).logits[0].float() lp = F.log_softmax(logits[s - 1 - start: e - 1 - start], dim=-1) tgt = torch.tensor(seq[s:e], device=self.device).unsqueeze(1) total += lp.gather(1, tgt).sum().item() s = e return total # ---------------------------------------------------------------------------- # Task evaluation # ---------------------------------------------------------------------------- def _softmax_prob(scores, label): m = max(scores) exps = [math.exp(s - m) for s in scores] return exps[label] / sum(exps) def aggregate(records, metric): if metric == "group_acc": groups = defaultdict(list) for i, r in enumerate(records): # items without a group are scored as single units groups[r["group"] if r["group"] is not None else f"__single_{i}"].append(r) units = [{ "correct": all(x["correct"] for x in g), "chance": math.prod(x["chance"] for x in g), "p_correct": math.prod(x["p_correct"] for x in g), "rr": sum(x["rr"] for x in g) / len(g), "level": max(x["level"] for x in g), } for g in groups.values()] else: units = records n = len(units) acc = sum(u["correct"] for u in units) / n chance = sum(u["chance"] for u in units) / n score = max(0.0, (acc - chance) / (1.0 - chance)) * 100.0 se_acc = math.sqrt(acc * (1.0 - acc) / n) se_score = se_acc / (1.0 - chance) * 100.0 by_lvl = defaultdict(list) for u in units: by_lvl[u["level"]].append(u) levels = {} for lvl in sorted(by_lvl): us = by_lvl[lvl] levels[lvl] = { "n": len(us), "acc": sum(u["correct"] for u in us) / len(us), "chance": sum(u["chance"] for u in us) / len(us), } return { "kind": "choice", "n_items": len(records), "n_units": n, "item_acc": sum(r["correct"] for r in records) / len(records), "acc": acc, "chance": chance, "score": score, "se": se_score, "p_correct": sum(u["p_correct"] for u in units) / n, "mrr": sum(u["rr"] for u in units) / n, "levels": levels, } def evaluate_choice_task(scorer, task, dump=None): scoring = task["scoring"] default_null = task.get("null_context", "Answer:") requests, plan = [], [] for it in task["items"]: entries = [] if "contexts" in it: # multi-context (partial scoring, Winograd style) nb = len(it["continuation"].encode("utf-8")) for ctx in it["contexts"]: requests.append((ctx, it["continuation"])) entries.append((len(requests) - 1, None, nb)) else: for ch in it["choices"]: requests.append((it.get("context", ""), ch)) ci, ni = len(requests) - 1, None if scoring == "pmi": requests.append((it.get("null_context", default_null), ch)) ni = len(requests) - 1 entries.append((ci, ni, len(ch.encode("utf-8")))) plan.append(entries) lls = scorer.loglikelihood(requests) records = [] for it, entries in zip(task["items"], plan): scores = [] for ci, ni, nb in entries: ll = lls[ci] if scoring == "sum": scores.append(ll) elif scoring == "mean_byte": scores.append(ll / max(nb, 1)) elif scoring == "pmi": scores.append(ll - lls[ni]) else: raise ValueError(f"Unknown scoring: {scoring}") label = it["label"] pred = max(range(len(scores)), key=lambda k: scores[k]) rank = 1 + sum(1 for s in scores if s > scores[label]) # mean_byte scores are per byte -> rescale to sequence level, otherwise P(corr) is ~uniform scale = sum(nb for _, _, nb in entries) / len(entries) if scoring == "mean_byte" else 1.0 records.append({ "level": it["level"], "correct": pred == label, "chance": 1.0 / len(scores), "p_correct": _softmax_prob([s * scale for s in scores], label), "rr": 1.0 / rank, "group": it.get("group"), }) if dump is not None: dump.append({ "task": task["name"], "level": it["level"], "group": it.get("group"), "context": it.get("context", it.get("contexts")), "choices": it.get("choices", it.get("continuation")), "scores": [round(s, 4) for s in scores], "label": label, "pred": pred, "correct": pred == label, }) return aggregate(records, task.get("metric", "acc")) def evaluate_bpb_task(scorer, task): total_ll, total_bytes, per_text = 0.0, 0, [] for text in task["texts"]: ll = scorer.rolling_loglikelihood(text) nb = len(text.encode("utf-8")) total_ll += ll total_bytes += nb per_text.append(-ll / (math.log(2) * nb)) bpb = -total_ll / (math.log(2) * total_bytes) lo, hi = task["anchors"]["floor"], task["anchors"]["ceiling"] score = 100.0 * (math.log(lo) - math.log(bpb)) / (math.log(lo) - math.log(hi)) return {"kind": "bpb", "n_items": len(task["texts"]), "bpb": bpb, "bpb_per_text": per_text, "score": min(100.0, max(0.0, score)), "se": 0.0} # ---------------------------------------------------------------------------- # Index # ---------------------------------------------------------------------------- def compute_index(tasks, results): by_dom = defaultdict(list) for t in tasks: by_dom[t["domain"]].append(results[t["name"]]) dom_scores, dom_se = {}, {} for d, rs in by_dom.items(): k = len(rs) dom_scores[d] = sum(r["score"] for r in rs) / k dom_se[d] = math.sqrt(sum(r["se"] ** 2 for r in rs)) / k wsum = sum(DOMAIN_WEIGHTS[d] for d in dom_scores) index = sum(DOMAIN_WEIGHTS[d] * s for d, s in dom_scores.items()) / wsum index_se = math.sqrt(sum((DOMAIN_WEIGHTS[d] / wsum) ** 2 * dom_se[d] ** 2 for d in dom_scores)) return dom_scores, dom_se, index, index_se # ---------------------------------------------------------------------------- # Reporting # ---------------------------------------------------------------------------- def print_report(meta, tasks, results, dom_scores, dom_se, index, index_se, show_levels): line = "=" * 96 print("\n" + line) print(f"{BENCHMARK_NAME} v{VERSION}") print(f"Model: {meta['model_dir']} | Params: {meta['n_params'] / 1e6:.1f}M | " f"max_length: {meta['max_length']} | device: {meta['device']} | {meta['runtime_s']:.1f}s") print(line) print(f"{'Task':<32}{'Dom':<5}{'N':>5}{'Acc%':>8}{'Chance%':>9}{'NormAcc':>9}{'±SE':>7}" f"{'P(corr)':>9}{'MRR':>7}") print("-" * 96) for t in tasks: r = results[t["name"]] if r["kind"] == "bpb": print(f"{t['name']:<32}{t['domain']:<5}{r['n_items']:>5} BPB = {r['bpb']:.4f}" f"{'':>6}{r['score']:>9.1f} (anchor-normalized)") continue print(f"{t['name']:<32}{t['domain']:<5}{r['n_units']:>5}{r['acc'] * 100:>8.1f}" f"{r['chance'] * 100:>9.1f}{r['score']:>9.1f}{r['se']:>7.1f}" f"{r['p_correct']:>9.3f}{r['mrr']:>7.3f}") if show_levels: lv = " ".join(f"L{l}: {v['acc'] * 100:.0f}% (n={v['n']}, c={v['chance'] * 100:.0f}%)" for l, v in r["levels"].items()) print(f"{'':<6}{lv}") print("-" * 96) print("Domain scores (0-100, chance-normalized):") for d in DOMAINS: if d in dom_scores: print(f" {d} {DOMAINS[d]:<34} w={DOMAIN_WEIGHTS[d]:.2f} " f"{dom_scores[d]:6.1f} ± {dom_se[d]:.1f}") print(line) print(f" μBench-Intelligence-Index: {index:.2f} ± {index_se:.2f} (SE, item sampling)") print(line) print("Note: treat index differences < 2*sqrt(SE_a^2 + SE_b^2) as noise.\n") # ---------------------------------------------------------------------------- # Main # ---------------------------------------------------------------------------- def resolve_device(arg): if arg != "auto": return torch.device(arg) if torch.cuda.is_available(): return torch.device("cuda") if getattr(torch.backends, "mps", None) is not None and torch.backends.mps.is_available(): return torch.device("mps") return torch.device("cpu") def parse_args(): p = argparse.ArgumentParser(description=f"{BENCHMARK_NAME} evaluation suite") p.add_argument("--model_dir", help="Local model folder or Hugging Face model id (e.g. org/name); must include the tokenizer") p.add_argument("--batch_size", type=int, default=16) p.add_argument("--device", default="auto", help="auto | cpu | cuda | cuda:0 | mps") p.add_argument("--dtype", default="float32", choices=list(DTYPES)) p.add_argument("--max_length", type=int, default=512) p.add_argument("--tasks", default=None, help="Comma-separated task names or prefixes, e.g. '1a,4b'") p.add_argument("--output", default=None, help="Write results as JSON to this path") p.add_argument("--dump", default=None, help="Write per-item predictions as JSONL to this path") p.add_argument("--show_levels", action="store_true", help="Print accuracy per difficulty level") p.add_argument("--trust_remote_code", action="store_true", help="Load custom modeling code (configuration_*.py, modeling_*.py) from a local folder or the HF Hub") p.add_argument("--list_tasks", action="store_true", help="List tasks and exit") return p.parse_args() def main(): args = parse_args() tasks = build_tasks() if args.list_tasks: for t in tasks: n = len(t.get("items", t.get("texts", []))) print(f"{t['name']:<32}{t['domain']:<5}{n:>4} {t['description']}") return if not args.model_dir: raise SystemExit("--model_dir is required (local folder or HF model id).") if args.tasks: wanted = [w.strip() for w in args.tasks.split(",") if w.strip()] tasks = [t for t in tasks if t["name"] in wanted or t["name"].split("_")[0] in wanted] if not tasks: raise SystemExit(f"No tasks match {wanted}.") device = resolve_device(args.device) print(f"Loading model from {args.model_dir} on {device} ({args.dtype}) ...") scorer = LMScorer(args.model_dir, device, DTYPES[args.dtype], args.max_length, args.batch_size, args.trust_remote_code) results, t0 = {}, time.time() dump_rows = [] if args.dump else None for t in tasks: ts = time.time() if t.get("kind") == "bpb": results[t["name"]] = evaluate_bpb_task(scorer, t) else: results[t["name"]] = evaluate_choice_task(scorer, t, dump_rows) print(f" [{t['name']}] score={results[t['name']]['score']:.1f} ({time.time() - ts:.1f}s)") dom_scores, dom_se, index, index_se = compute_index(tasks, results) meta = { "benchmark": BENCHMARK_NAME, "version": VERSION, "model_dir": args.model_dir, "n_params": scorer.n_params, "max_length": scorer.max_length, "device": str(device), "dtype": args.dtype, "runtime_s": time.time() - t0, } print_report(meta, tasks, results, dom_scores, dom_se, index, index_se, args.show_levels) if args.output: out = { "meta": meta, "tasks": {t["name"]: {"domain": t["domain"], "format": t["format"], "scoring": t.get("scoring"), **results[t["name"]]} for t in tasks}, "domains": {d: {"name": DOMAINS[d], "weight": DOMAIN_WEIGHTS[d], "score": dom_scores[d], "se": dom_se[d]} for d in dom_scores}, "mubench_intelligence_index": index, "mubench_intelligence_index_se": index_se, } with open(args.output, "w", encoding="utf-8") as f: json.dump(out, f, indent=2, ensure_ascii=False) print(f"Results written to {args.output}") if args.dump: with open(args.dump, "w", encoding="utf-8") as f: for row in dump_rows: f.write(json.dumps(row, ensure_ascii=False) + "\n") print(f"Per-item predictions written to {args.dump}") if __name__ == "__main__": main()