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258 lines
11 KiB
Python
258 lines
11 KiB
Python
"""Bounded, hash verified CSI feature intake and explicit grouped partitions.
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Manifest v1 has a ``files`` list. Each entry supplies path, sha256,
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captured_at (UTC ISO 8601), room_id, session_id, split, evidence and
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use_permitted. Capture dates are declarations, not inferred from file mtimes.
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"""
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from dataclasses import dataclass
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from datetime import datetime, timezone
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import hashlib
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import json
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import math
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from pathlib import Path
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import re
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import stat
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import numpy as np
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SPLITS = ("train", "validation", "test")
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MAX_FILE_BYTES = 256 * 1024 * 1024
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MAX_TOTAL_BYTES = 512 * 1024 * 1024
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MAX_MANIFEST_BYTES = 1024 * 1024
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MAX_LINE_BYTES = 65536
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MAX_FRAMES = 500000
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MAX_INPUT_LINES = 1000000
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class DataError(ValueError):
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"""Input does not satisfy the training evidence contract."""
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@dataclass
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class Partition:
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features: np.ndarray
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timestamps: np.ndarray
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node_ids: list
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groups: list
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session_ids: list
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@dataclass
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class Dataset:
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partitions: dict
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inventory: list
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manifest_sha256: str
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group_by: str
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@dataclass
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class Standardizer:
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mean: np.ndarray
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scale: np.ndarray
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def transform(self, features):
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values = np.asarray(features, dtype=np.float64)
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if values.ndim != 2 or values.shape[1] != 8 or not np.isfinite(values).all():
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raise DataError("standardizer requires finite Nx8 features")
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result = (values - self.mean) / self.scale
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if not np.isfinite(result).all():
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raise DataError("standardization overflow")
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return result.astype(np.float32)
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def fit_standardizer(train_features):
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values = np.asarray(train_features, dtype=np.float64)
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if values.ndim != 2 or values.shape[1] != 8 or len(values) < 2 or not np.isfinite(values).all():
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raise DataError("fit requires at least two finite training feature rows")
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mean, scale = values.mean(axis=0), values.std(axis=0)
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if not np.isfinite(mean).all() or not np.isfinite(scale).all():
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raise DataError("training statistics overflow")
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return Standardizer(mean, np.where(scale < 1e-8, 1.0, scale))
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def _json(text):
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def pairs(items):
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result = {}
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for key, value in items:
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if key in result:
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raise DataError("duplicate JSON key")
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result[key] = value
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return result
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try:
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return json.loads(text, object_pairs_hook=pairs,
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parse_constant=lambda _: (_ for _ in ()).throw(DataError("nonfinite JSON number")))
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except (ValueError, UnicodeError) as exc:
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raise DataError("invalid JSON input") from exc
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def _regular(path, maximum):
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if path.is_symlink():
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raise DataError("symlink input is not permitted")
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try:
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info = path.stat()
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except OSError as exc:
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raise DataError("input file unavailable") from exc
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if not stat.S_ISREG(info.st_mode) or info.st_size > maximum:
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raise DataError("input must be a bounded regular file")
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return info.st_size
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def _text(value, name):
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if not isinstance(value, str) or not value.strip() or len(value) > 256 or any(ord(c) < 32 for c in value):
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raise DataError(f"invalid {name}")
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return value
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def _manifest(path):
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path = Path(path).absolute()
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_regular(path, MAX_MANIFEST_BYTES)
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raw = path.read_bytes()
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if len(raw) > MAX_MANIFEST_BYTES:
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raise DataError("manifest exceeds limit")
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obj = _json(raw)
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if not isinstance(obj, dict) or type(obj.get("schema_version")) is not int or obj["schema_version"] != 1:
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raise DataError("manifest schema_version must equal 1")
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entries = obj.get("files")
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if not isinstance(entries, list) or not entries or len(entries) > 1024:
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raise DataError("manifest files must contain 1 to 1024 entries")
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checked, digests, total = [], set(), 0
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for index, entry in enumerate(entries):
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if not isinstance(entry, dict):
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raise DataError("manifest file entry must be an object")
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for key in ("room_id", "session_id", "path"):
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_text(entry.get(key), key)
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digest = entry.get("sha256")
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if not isinstance(digest, str) or not re.fullmatch(r"[0-9a-f]{64}", digest):
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raise DataError("sha256 must be a lowercase hex digest")
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if digest in digests:
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raise DataError("duplicate file hash")
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digests.add(digest)
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if entry.get("split") not in SPLITS or entry.get("evidence") not in ("real", "synthetic"):
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raise DataError("invalid split or evidence")
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if entry.get("use_permitted") is not True:
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raise DataError("explicit use_permitted=true is required")
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captured = _text(entry.get("captured_at"), "captured_at")
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try:
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date = datetime.fromisoformat(captured.replace("Z", "+00:00"))
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except ValueError as exc:
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raise DataError("invalid captured_at") from exc
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if date.tzinfo is None or date.utcoffset() != timezone.utc.utcoffset(date):
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raise DataError("captured_at must specify UTC")
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source = path.parent / entry["path"]
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total += _regular(source, MAX_FILE_BYTES)
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if total > MAX_TOTAL_BYTES:
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raise DataError("total dataset exceeds byte limit")
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checked.append((dict(entry, captured_at=date.isoformat()), source, index))
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return checked, hashlib.sha256(raw).hexdigest()
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def discover(manifest):
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"""Inventory declared capture dates; load_manifest verifies hashes and frames."""
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entries, _ = _manifest(manifest)
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return sorted([dict(captured_at=e["captured_at"], sha256=e["sha256"],
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split=e["split"], evidence=e["evidence"],
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room_id=e["room_id"], session_id=e["session_id"])
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for e, _, _ in entries], key=lambda e: datetime.fromisoformat(e["captured_at"]), reverse=True)
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def _number(value):
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if type(value) not in (int, float) or abs(value) > 1e20 or not math.isfinite(value):
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raise DataError("numeric values must be finite and bounded")
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return 0.0 if value == 0 else float(value)
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def load_manifest(manifest, group_by="room_id", allow_synthetic=False):
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"""Validate partitions without deriving labels or creating raw CSI features."""
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if group_by not in ("room_id", "session_id"):
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raise DataError("group_by must be room_id or session_id")
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entries, manifest_digest = _manifest(manifest)
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owners, session_owners, fingerprints, rows = {}, {}, {}, {s: [] for s in SPLITS}
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seen_observations = set()
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frame_count = 0
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input_lines = 0
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for entry, source, index in entries:
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split, group = entry["split"], entry[group_by]
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if entry["evidence"] == "synthetic" and not allow_synthetic:
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raise DataError("synthetic data requires explicit allow_synthetic")
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for mapping, key in ((owners, group), (session_owners, entry["session_id"])):
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if key in mapping and mapping[key] != split:
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raise DataError("group or session appears across splits")
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mapping[key] = split
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digest, last, count, size = hashlib.sha256(), {}, 0, 0
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with source.open("rb") as stream:
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while True:
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line = stream.readline(MAX_LINE_BYTES + 1)
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if not line:
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break
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input_lines += 1
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if input_lines > MAX_INPUT_LINES:
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raise DataError("dataset exceeds input line limit")
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size += len(line)
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if len(line) > MAX_LINE_BYTES or size > MAX_FILE_BYTES:
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raise DataError("capture line or file exceeds limit")
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digest.update(line)
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if not line.strip():
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continue
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row = _json(line)
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if not isinstance(row, dict):
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raise DataError("capture row must be an object")
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# Mixed legacy recordings are supported only for explicit types.
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if row.get("type") in ("vitals", "raw_csi"):
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continue
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if row.get("type") not in (None, "feature", "features"):
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raise DataError("unsupported capture row type")
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features = row.get("features")
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node = row.get("node_id")
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if isinstance(features, dict):
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# CsiRecorder.write_frame removes the packet type and places
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# explicit packet features/node_id in this nested envelope.
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# Outer timestamp is already seconds; timestamp_us is metadata.
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if row.get("type") is not None or features.get("type") not in (None, "feature", "features"):
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raise DataError("unsupported collector envelope")
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node = features.get("node_id")
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features = features.get("features")
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if not isinstance(features, list) or len(features) != 8:
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raise DataError("feature rows require eight explicit features")
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features = [_number(v) for v in features]
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timestamp = _number(row.get("timestamp"))
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if type(node) is int:
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if node < 0 or node > 2**32 - 1:
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raise DataError("invalid node_id")
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node = str(node)
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else:
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node = _text(node, "node_id")
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observation = (entry["session_id"], node, timestamp)
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if observation in seen_observations:
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raise DataError("duplicate session/node/timestamp observation")
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seen_observations.add(observation)
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if node in last and timestamp < last[node]:
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raise DataError("timestamps must be monotonic per node")
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last[node] = timestamp
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# Bounded copy heuristic, not proof of absence of leakage.
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# Idle/quantized vectors can legitimately recur at distinct times.
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signature = json.dumps([timestamp, node, features], separators=(",", ":")).encode()
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fingerprint = hashlib.sha256(signature).digest()
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if fingerprint in fingerprints and fingerprints[fingerprint] != split:
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raise DataError("duplicate feature frame across splits")
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fingerprints[fingerprint] = split
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rows[split].append((features, timestamp, node, group, entry["session_id"]))
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count += 1
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frame_count += 1
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if frame_count > MAX_FRAMES:
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raise DataError("dataset exceeds frame limit")
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if digest.hexdigest() != entry["sha256"]:
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raise DataError(f"file hash mismatch at manifest entry {index}")
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if count == 0:
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raise DataError("capture has no explicit feature rows; raw CSI requires a reviewed adapter")
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partitions = {}
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for split, values in rows.items():
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if len(values) < 2:
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raise DataError(f"partition {split} requires at least two feature rows")
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features, timestamps, nodes, groups, sessions = zip(*values)
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partitions[split] = Partition(np.asarray(features, dtype=np.float64),
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np.asarray(timestamps, dtype=np.float64),
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list(nodes), list(groups), list(sessions))
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inventory = sorted([{k: e[k] for k in ("captured_at", "sha256", "split", "evidence", "room_id", "session_id")}
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for e, _, _ in entries], key=lambda e: datetime.fromisoformat(e["captured_at"]), reverse=True)
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return Dataset(partitions, inventory, manifest_digest, group_by)
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