Datasets:
File size: 2,273 Bytes
a4e6b16 | 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 | """Render a few parquet rows as readable markdown for a PR description.
Usage: python3 src/render_sample.py data/<key>/<key>.parquet [-n 3] [--max-chars 800]
Each document becomes a fenced block: metadata as `key: value` lines, a blank
line, then the text with real newlines, truncated with `[…]`.
"""
import argparse
import random
import re
import pyarrow.parquet as pq
def sample_rows(path, n, seed=0):
"""n rows from distinct random row groups (seeded), so a 2B-token shard isn't read whole."""
pf = pq.ParquetFile(path)
if pf.num_row_groups == 0 or n <= 0:
return []
rng = random.Random(seed)
groups = rng.sample(range(pf.num_row_groups), min(n, pf.num_row_groups))
per_group = -(-n // len(groups)) # ceil: few row groups -> several rows each
rows = []
for g in sorted(groups):
batch = pf.read_row_group(g).to_pylist()
rows += rng.sample(batch, min(per_group, len(batch)))
return rows[:n]
def truncate(text, max_chars):
text = text.strip()
if len(text) <= max_chars:
return text
cut = text[:max_chars]
space = max(cut.rfind(" "), cut.rfind("\n"))
return (cut[:space] if space > 0 else cut).rstrip() + " […]"
def fmt_value(v):
if isinstance(v, (list, tuple)):
return ", ".join(fmt_value(x) for x in v)
if hasattr(v, "isoformat"):
return v.isoformat()
return str(v)
def render_doc(row, max_chars):
meta = [f"{k}: {fmt_value(v)}" for k, v in row.items() if k != "text"]
body = "\n".join(meta) + "\n\n" + truncate(row.get("text") or "", max_chars)
longest = max((len(m) for m in re.findall(r"`+", body)), default=0)
fence = "`" * max(3, longest + 1)
return f"{fence}\n{body}\n{fence}"
def render(path, n=3, max_chars=800, seed=0):
return "\n\n".join(render_doc(r, max_chars) for r in sample_rows(path, n, seed))
if __name__ == "__main__":
ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
ap.add_argument("parquet")
ap.add_argument("-n", type=int, default=3)
ap.add_argument("--max-chars", type=int, default=800)
ap.add_argument("--seed", type=int, default=0)
a = ap.parse_args()
print(render(a.parquet, a.n, a.max_chars, a.seed))
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