scripts/validate_dataset.py

#!/usr/bin/env python3
"""Independent validation for the published Sphregis Parquet files."""

from __future__ import annotations

import argparse
import hashlib
import io
import json
import re
import unicodedata
from collections import Counter
from pathlib import Path

import pyarrow.parquet as pq

try:
    from scripts.vendor.conll18_ud_eval import UDError, load_conllu
except ModuleNotFoundError:  # Direct execution from the scripts directory.
    from vendor.conll18_ud_eval import UDError, load_conllu

try:
    from scripts.dataset_variants import (
        BOTTLENECK_TARGET,
        actual_order_key,
        variant_schema,
    )
except ModuleNotFoundError:  # Direct execution from the scripts directory.
    from dataset_variants import (  # type: ignore[no-redef]
        BOTTLENECK_TARGET,
        actual_order_key,
        variant_schema,
    )


BASE_CONFIGS = ("prose", "verse_sentence", "verse_metre")
VARIANT_SUFFIXES = ("1", "10", "100")
CONFIGS = tuple(
    f"{config}_{suffix}" for config in BASE_CONFIGS for suffix in VARIANT_SUFFIXES
)
SPLITS = ("train", "validation", "test")
SAFE_CONLLU_MISC_KEYS = {"NativeRel", "NativeHead", "HeadRepair", "SpaceAfter"}

UD_V2_RELATIONS = {
    "acl", "advcl", "advmod", "amod", "appos", "aux", "case", "cc",
    "ccomp", "clf", "compound", "conj", "cop", "csubj", "dep", "det",
    "discourse", "dislocated", "expl", "fixed", "flat", "goeswith",
    "iobj", "list", "mark", "nmod", "nsubj", "nummod", "obj", "obl",
    "orphan", "parataxis", "punct", "reparandum", "root", "vocative",
    "xcomp",
}

EXCLUDED_DEMOSTHENIC_SPEECHS = {7, 17, 46, 47, 49, 50, 52, 53, 59}
EXCLUDED_AUTHOR_WORKS = {
    ("Aeschylus", "Prometheus Bound"),
    ("Aesop", "Fables"),
    ("Aesop", "Fables 1–50"),
    ("Antiphon", "antiphon 1 bu2"),
    ("Antiphon", "antiphon 2 bu2"),
    ("Chion", "Letters"),
    ("Epictetus", "Dissertationes ab Arriano digestae"),
    ("First Council of Nicea", "Nicene Creed 325 CE"),
    ("Hesiod", "Shield of Heracles"),
    ("Isocrates", "Letters"),
    ("John of Patmos", "Revelation"),
    ("Plato", "Cleitophon"),
    ("Xenophon", "xen cyr 8.8 bu1"),
}


LIGHT_COLUMNS = [
    "id", "parent_sentence_ids", "author", "work", "work_id", "genre", "text",
    "passage", "source_records",
    "dedup_key", "split", "alignment_component_id",
    "component_sentence_index", "component_line_index", "metrical_line_ids",
    "book", "poem_sequence", "line_number", "hypotactic_file",
    "syllables",
    "chunk_size", "chunk_target_size", "constituent_ids",
    "constituent_provenance", "chunk_work_ids", "chunk_works",
    "chunk_is_mixed_work",
]


def read_config(root: Path, config: str) -> list[dict]:
    rows = []
    for split in SPLITS:
        path = root / config / f"{split}-00000-of-00001.parquet"
        assert path.is_file(), f"missing {path}"
        parquet = pq.ParquetFile(path)
        columns = [name for name in LIGHT_COLUMNS if name in parquet.schema_arrow.names]
        if not config.endswith("_1"):
            columns.remove("source_records")
        part = parquet.read(columns=columns, use_threads=False).to_pylist()
        assert all(row["split"] == split for row in part), f"split label mismatch in {path}"
        rows.extend(part)
    return rows


def normalize(text: str) -> str:
    text = text.lower().replace("ς", "σ")
    text = "".join(
        char for char in unicodedata.normalize("NFD", text)
        if unicodedata.category(char) != "Mn"
    )
    return "".join(char for char in text if char.isalpha())


def validate_work_stratification(configs: dict[str, list[dict]]) -> None:
    """Validate the balanced splits after the shared 100-row bottleneck."""
    for config in (f"{base}_1" for base in BASE_CONFIGS):
        rows = configs[config]
        groups = {}
        for row in rows:
            groups.setdefault(row["author"], []).append(row)
        for author, author_rows in groups.items():
            actual = Counter(row["split"] for row in author_rows)
            assert actual["train"] > 0
            assert actual["validation"] == actual["test"]
            assert actual["validation"] >= BOTTLENECK_TARGET
            assert actual["validation"] % BOTTLENECK_TARGET == 0, (
                f"{config} is not 100-row chunkable for {author}: {dict(actual)}"
            )


def validate_authorship_policy(configs: dict[str, list[dict]]) -> None:
    rows = [row for config in BASE_CONFIGS for row in configs[f"{config}_1"]]
    for row in rows:
        author = row["author"]
        lowered = author.casefold()
        assert not lowered.startswith(("unknown", "anonymous", "pseudo-", "(pseudo-"))
        assert "(traditional)" not in lowered
        assert not re.search(r"\bfragments?\b", row["work"], re.I)
        assert (author, row["work"]) not in EXCLUDED_AUTHOR_WORKS
        if author == "Demosthenes":
            match = re.match(r"^dem(?:osthenes)?[ _]+(\d+)", row["work"], re.I)
            assert not match or int(match.group(1)) not in EXCLUDED_DEMOSTHENIC_SPEECHS
        if author.startswith("Homeric-"):
            assert (author, row["work"]) in {
                ("Homeric-Iliad", "Iliad"),
                ("Homeric-Odyssey", "Odyssey"),
            }
        assert author != "Homer"

    for row in configs["verse_metre_1"]:
        if (row["author"], row["work"]) != ("Aeschylus", "Seven Against Thebes"):
            continue
        match = re.match(r"^(\d+)", str(row["line_number"]))
        if match:
            number = int(match.group(1))
            assert not (861 <= number <= 874 or 1005 <= number <= 1078)


def validate_provenance_and_verse(root: Path) -> int:
    checked_lines = 0
    required_record_fields = {
        "source", "source_file", "source_sentence_id", "url", "revision",
        "license", "annotation_provenance", "syntax_scheme",
    }
    for config in (f"{base}_1" for base in BASE_CONFIGS):
        for split in SPLITS:
            path = root / config / f"{split}-00000-of-00001.parquet"
            columns = ["source_records", "licenses"]
            if config == "verse_sentence_1":
                columns += ["metrical_line_ids", "metrical_lines"]
            elif config == "verse_metre_1":
                columns += [
                    "metre", "syllables", "hypotactic_file",
                ]
            parquet = pq.ParquetFile(path)
            for batch in parquet.iter_batches(columns=columns, batch_size=256, use_threads=False):
                for row in batch.to_pylist():
                    records = json.loads(row["source_records"])
                    assert "NLP repackaging by Urdatorn" not in row["source_records"]
                    assert records and all(required_record_fields <= record.keys() for record in records)
                    assert all(re.fullmatch(r"[0-9a-f]{40}", record["revision"]) for record in records)
                    assert sorted(row["licenses"]) == sorted({record["license"] for record in records})
                    if config == "verse_sentence_1":
                        lines = json.loads(row["metrical_lines"])
                        assert lines and [line["id"] for line in lines] == row["metrical_line_ids"]
                        assert all(line["metre"] and line["syllables"] for line in lines)
                        assert all("scansion" not in line for line in lines)
                    elif config == "verse_metre_1":
                        syllables = json.loads(row["syllables"])
                        assert row["metre"] and syllables
                        hyp_records = [record for record in records if record["source"] == "hypotactic"]
                        assert len(hyp_records) == 1
                        assert hyp_records[0]["source_file"] == row["hypotactic_file"]
                        checked_lines += 1
    return checked_lines


def cumulative_lengths(rows: list[dict]) -> list[int]:
    boundaries = [0]
    for row in rows:
        boundaries.append(boundaries[-1] + len(normalize(row["text"])))
    return boundaries


def validate_alignment_components(configs: dict[str, list[dict]]) -> int:
    complete_components = 0
    for suffix in ("1",):
        sentences_by_id = {row["id"]: row for row in configs[f"verse_sentence_{suffix}"]}
        lines_by_id = {row["id"]: row for row in configs[f"verse_metre_{suffix}"]}
        components = {}
        for base, kind in (("verse_sentence", "sentences"), ("verse_metre", "lines")):
            for row in configs[f"{base}_{suffix}"]:
                components.setdefault(
                    row["alignment_component_id"], {"sentences": [], "lines": []}
                )[kind].append(row)
        for component in components.values():
            sentences = sorted(component["sentences"], key=lambda row: row["component_sentence_index"])
            lines = sorted(component["lines"], key=lambda row: row["component_line_index"])
            if not sentences or not lines:
                continue
            sentence_ids = {row["id"] for row in sentences}
            line_ids = {row["id"] for row in lines}
            if any(not set(row["metrical_line_ids"]) <= line_ids for row in sentences):
                continue
            if any(not set(row["parent_sentence_ids"]) <= sentence_ids for row in lines):
                continue
            sentence_text = "".join(normalize(row["text"]) for row in sentences)
            line_text = "".join(normalize(row["text"]) for row in lines)
            assert sentence_text == line_text
            complete_components += 1
            sentence_bounds = cumulative_lengths(sentences)
            line_bounds = cumulative_lengths(lines)
            for sentence_index, sentence in enumerate(sentences):
                start, end = sentence_bounds[sentence_index:sentence_index + 2]
                expected = [
                    line["id"] for line_index, line in enumerate(lines)
                    if max(start, line_bounds[line_index]) < min(end, line_bounds[line_index + 1])
                ]
                assert sentence["metrical_line_ids"] == expected
            for line_index, line in enumerate(lines):
                start, end = line_bounds[line_index:line_index + 2]
                expected = [
                    sentence["id"] for sentence_index, sentence in enumerate(sentences)
                    if max(start, sentence_bounds[sentence_index]) < min(end, sentence_bounds[sentence_index + 1])
                ]
                assert line["parent_sentence_ids"] == expected
                assert all(parent_id in sentences_by_id for parent_id in expected)
                assert line["id"] in lines_by_id
    return complete_components


def validate_variants(configs: dict[str, list[dict]]) -> None:
    for base in BASE_CONFIGS:
        atomic = configs[f"{base}_1"]
        atomic_by_id = {row["id"]: row for row in atomic}
        atomic_authors = {row["author"] for row in atomic}
        atomic_counts = {
            split: Counter(row["author"] for row in atomic if row["split"] == split)
            for split in ("validation", "test")
        }
        assert set(atomic_counts["validation"]) == atomic_authors
        assert set(atomic_counts["test"]) == atomic_authors
        for split in ("validation", "test"):
            assert all(
                count >= BOTTLENECK_TARGET and count % BOTTLENECK_TARGET == 0
                for count in atomic_counts[split].values()
            )

        for threshold in (10, 100):
            config = f"{base}_{threshold}"
            rows = configs[config]
            assert {row["author"] for row in rows} == atomic_authors
            train = [row for row in rows if row["split"] == "train"]
            expected_train_ids = {
                row["id"] for row in atomic if row["split"] == "train"
            }
            assert {row["id"] for row in train} == expected_train_ids
            assert all(row["chunk_size"] == 1 for row in train)
            assert all(row["chunk_target_size"] == threshold for row in train)
            assert all(row["constituent_ids"] == [row["id"]] for row in train)

            for split in ("validation", "test"):
                chunks = [row for row in rows if row["split"] == split]
                by_author = {}
                for row in atomic:
                    if row["split"] == split:
                        by_author.setdefault(row["author"], []).append(row)
                chunks_by_author = {}
                for chunk in chunks:
                    chunks_by_author.setdefault(chunk["author"], []).append(chunk)
                    assert chunk["chunk_size"] == threshold
                    assert chunk["chunk_target_size"] == threshold
                    assert len(chunk["constituent_ids"]) == threshold
                    assert len(set(chunk["constituent_ids"])) == threshold
                    constituents = [atomic_by_id[row_id] for row_id in chunk["constituent_ids"]]
                    assert all(row["author"] == chunk["author"] for row in constituents)
                    assert all(row["split"] == split for row in constituents)
                    assert chunk["text"] == (
                        "\n" if base == "verse_metre" else "\n\n"
                    ).join(row["text"].strip() for row in constituents)
                    if base == "verse_metre":
                        expected_syllables = [
                            syllable
                            for row in constituents
                            for syllable in json.loads(row["syllables"])
                        ]
                        assert json.loads(chunk["syllables"]) == expected_syllables
                    provenance = json.loads(chunk["constituent_provenance"])
                    assert [record["id"] for record in provenance] == chunk["constituent_ids"]
                    work_ids = []
                    for row in constituents:
                        if row["work_id"] not in work_ids:
                            work_ids.append(row["work_id"])
                    assert chunk["chunk_work_ids"] == work_ids
                    assert chunk["chunk_is_mixed_work"] == (len(work_ids) > 1)
                    for work_id in work_ids:
                        work_rows = [row for row in constituents if row["work_id"] == work_id]
                        assert work_rows == sorted(work_rows, key=actual_order_key)

                assert set(chunks_by_author) == atomic_authors
                for author, source_rows in by_author.items():
                    author_chunks = chunks_by_author[author]
                    used_ids = [
                        row_id for chunk in author_chunks for row_id in chunk["constituent_ids"]
                    ]
                    assert len(used_ids) == len(set(used_ids))
                    assert set(used_ids) == {row["id"] for row in source_rows}
                    assert len(author_chunks) == len(source_rows) // threshold


def validate_schemas(root: Path) -> None:
    for base in BASE_CONFIGS:
        base_schemas = [
            pq.ParquetFile(root / f"{base}_1" / f"{split}-00000-of-00001.parquet").schema_arrow
            for split in SPLITS
        ]
        assert all(schema == base_schemas[0] for schema in base_schemas)
        base_schema = base_schemas[0]
        if base == "verse_metre":
            assert "scansion" not in base_schema.names
        expected_variant_schema = variant_schema(base_schema)
        for threshold in (10, 100):
            schemas = [
                pq.ParquetFile(
                    root / f"{base}_{threshold}" / f"{split}-00000-of-00001.parquet"
                ).schema_arrow
                for split in SPLITS
            ]
            assert all(schema == expected_variant_schema for schema in schemas)
            if base == "verse_metre":
                assert all("scansion" not in schema.names for schema in schemas)


def validate_conllu(root: Path) -> tuple[int, dict[str, str]]:
    checked = 0
    verse_conllu = {}
    for config in ("prose_1", "verse_sentence_1"):
        for split in SPLITS:
            path = root / config / f"{split}-00000-of-00001.parquet"
            parquet = pq.ParquetFile(path)
            for batch in parquet.iter_batches(columns=["id", "conllu"], batch_size=256, use_threads=False):
                for row in batch.to_pylist():
                    conllu = row["conllu"]
                    token_rows = [
                        line.split("\t") for line in conllu.splitlines()
                        if line and not line.startswith("#") and re.fullmatch(r"\d+", line.split("\t", 1)[0])
                    ]
                    assert token_rows and all(len(row) == 10 for row in token_rows)
                    assert all(
                        re.fullmatch(r"[a-z][a-z0-9-]{8}", row[4])
                        for row in token_rows
                    ), "XPOS is not a canonical nine-position Ancient Greek tag"
                    assert all(
                        row[7].split(":", 1)[0] in UD_V2_RELATIONS
                        and re.fullmatch(r"[a-z]+(?::[a-z][a-z0-9_-]*)?", row[7])
                        for row in token_rows
                    ), "dependency relation is not UD v2"
                    ids = [int(row[0]) for row in token_rows]
                    assert ids == list(range(1, len(ids) + 1))
                    heads = [int(row[6]) for row in token_rows]
                    assert all(0 <= head <= len(ids) for head in heads)
                    assert all(token_id != head for token_id, head in zip(ids, heads))
                    assert sum(head == 0 for head in heads) == 1
                    assert sum(row[7] == "root" for row in token_rows) == 1
                    assert all((head == 0) == (row[7] == "root") for row, head in zip(token_rows, heads))
                    for token_id in ids:
                        visited = set()
                        cursor = token_id
                        while cursor:
                            assert cursor not in visited, "dependency cycle"
                            visited.add(cursor)
                            cursor = heads[cursor - 1]
                    checked += 1
                    if config == "verse_sentence_1":
                        verse_conllu[row["id"]] = conllu
    return checked, verse_conllu


def validate_combined_conllu(root: Path, parent_conllu: dict[str, str]) -> int:
    checked = 0
    for split in SPLITS:
        path = root / "verse_metre_1" / f"{split}-00000-of-00001.parquet"
        parquet = pq.ParquetFile(path)
        for batch in parquet.iter_batches(columns=["parent_sentence_ids", "conllu"], batch_size=256, use_threads=False):
            for row in batch.to_pylist():
                if all(parent_id in parent_conllu for parent_id in row["parent_sentence_ids"]):
                    expected = "\n\n".join(
                        parent_conllu[parent_id].strip()
                        for parent_id in row["parent_sentence_ids"]
                    ) + "\n\n"
                    assert row["conllu"] == expected
                checked += 1
    return checked


def validate_conllu_with_official_loader(root: Path) -> int:
    checked = set()
    for config in CONFIGS:
        for split in SPLITS:
            path = root / config / f"{split}-00000-of-00001.parquet"
            parquet = pq.ParquetFile(path)
            for batch in parquet.iter_batches(
                columns=["id", "conllu"], batch_size=256, use_threads=False,
            ):
                for row in batch.to_pylist():
                    comments = [
                        line for line in row["conllu"].splitlines()
                        if line.startswith("#")
                    ]
                    assert all(line.startswith("# text = ") for line in comments), (
                        f"Identifying CoNLL-U comment in {config}/{split}, "
                        f"row {row['id']}: {comments}"
                    )
                    for line in row["conllu"].splitlines():
                        if not line or line.startswith("#"):
                            continue
                        columns = line.split("\t")
                        assert len(columns) == 10
                        misc_keys = {
                            item.split("=", 1)[0]
                            for item in columns[9].split("|")
                            if item != "_"
                        }
                        assert misc_keys <= SAFE_CONLLU_MISC_KEYS, (
                            f"Identifying CoNLL-U MISC field in {config}/{split}, "
                            f"row {row['id']}: {misc_keys}"
                        )
                    digest = hashlib.sha256(row["conllu"].encode("utf-8")).digest()
                    if digest in checked:
                        continue
                    try:
                        load_conllu(io.StringIO(row["conllu"]))
                    except UDError as error:
                        raise AssertionError(
                            f"Malformed CoNLL-U in {config}/{split}, row {row['id']}: {error}"
                        ) from error
                    checked.add(digest)
    return len(checked)


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument("--data", type=Path, default=Path("data"))
    args = parser.parse_args()
    configs = {config: read_config(args.data, config) for config in CONFIGS}
    for config, rows in configs.items():
        ids = [row["id"] for row in rows]
        assert len(ids) == len(set(ids)), f"duplicate IDs in {config}"
        base_config = config.rsplit("_", 1)[0]
        assert all(row["genre"] == base_config for row in rows)
        assert all(row["text"] and row["author"] and row["work"] for row in rows)
        if base_config == "prose":
            keys = [row["dedup_key"] for row in rows]
            assert len(keys) == len(set(keys)), "prose is not exactly deduplicated"
        print(config, len(rows), dict(Counter(row["split"] for row in rows)))
    validate_authorship_policy(configs)
    validate_work_stratification(configs)
    validate_schemas(args.data)
    validate_variants(configs)
    complete_components = validate_alignment_components(configs)
    checked_lines = validate_provenance_and_verse(args.data)
    checked, parent_conllu = validate_conllu(args.data)
    checked_combined = validate_combined_conllu(args.data, parent_conllu)
    checked_official = validate_conllu_with_official_loader(args.data)
    print("validated aligned metrical lines", checked_lines)
    print("validated complete retained verse alignment components", complete_components)
    print("validated CoNLL-U sentences", checked)
    print("validated combined metrical CoNLL-U documents", checked_combined)
    print("validated unique CoNLL-U documents with official CoNLL 2018 loader", checked_official)
    print("all checks passed")


if __name__ == "__main__":
    main()