File size: 2,077 Bytes
0185029 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | """Stable prompt and media identities used for sampling and leakage checks."""
from __future__ import annotations
import hashlib
import json
import os
import unicodedata
from collections.abc import Mapping
from pathlib import Path
from typing import Any
from .schema import media_paths, normalize_text
def normalized_media_anchor(path: str) -> str:
"""Return a case-normalized lexical identity for one local media path."""
normalized = os.path.normpath(str(path)).replace("\\", "/")
return unicodedata.normalize("NFKC", normalized).casefold()
def media_anchors(record: Mapping[str, Any]) -> tuple[str, ...]:
"""Return exact normalized media anchors for cap enforcement."""
return tuple(sorted({normalized_media_anchor(path) for path in media_paths(record)}))
def media_leakage_tokens(record: Mapping[str, Any]) -> frozenset[str]:
"""Return exact and basename tokens for fail-closed media comparisons."""
tokens: set[str] = set()
for anchor in media_anchors(record):
path = Path(anchor)
name = normalize_text(path.name)
stem = normalize_text(path.stem)
tokens.add(f"path:{anchor}")
if name:
tokens.add(f"name:{name}")
if stem:
tokens.add(f"stem:{stem}")
return frozenset(tokens)
def prompt_identity(record: Mapping[str, Any]) -> str:
"""Hash what is asked and its media, intentionally excluding the answer."""
payload = {
"media": media_anchors(record),
"problem": normalize_text(record.get("problem")),
"problem_type": normalize_text(record.get("problem_type")),
}
encoded = json.dumps(
payload,
ensure_ascii=False,
sort_keys=True,
separators=(",", ":"),
).encode("utf-8")
return hashlib.sha256(encoded).hexdigest()
def stable_rank(seed: int, namespace: str, identity: str) -> int:
"""Create a process-independent deterministic rank."""
payload = f"{seed}|{namespace}|{identity}".encode("utf-8")
return int.from_bytes(hashlib.sha256(payload).digest(), "big")
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