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metadata 
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license: apache-2.0

cornstack-samples

🚧 This dataset is under active development and may change.

cornstack-samples is a compact, sampled version of CoRNStack for code-focused embedding training, reranker training, and retrieval experiments.

Source dataset and paper:

Why this dataset

CoRNStack is large. This dataset provides smaller, practical subsets for faster iteration and lower-cost experiments.

Important notes:

  • This is a sampled dataset, not the full CoRNStack distribution.
  • If you need maximum coverage or full-scale training, use the original CoRNStack collection.

Config layout

Each language is published as two separate configs:

  • {lang}-v1-pair-2M
  • {lang}-v1-hard-negatives-100k

Each config uses split train.

{lang}-v1-pair-2M

Fields:

  • query
  • document

Target rows per language: ~2,000,000

{lang}-v1-hard-negatives-100k

Fields:

  • query
  • positive
  • negative_1
  • negative_2
  • negative_3
  • negative_4
  • negative_5
  • negative_6
  • negative_7

Target rows per language: ~100,000

Complete subset list (exact)

All subsets are published with split train.

Subset (config name) split num_examples type
go-v1-pair-2M train 2,000,000 pair
go-v1-hard-negatives-100k train 100,000 hard-negatives
java-v1-pair-2M train 2,000,000 pair
java-v1-hard-negatives-100k train 100,000 hard-negatives
javascript-v1-pair-2M train 2,000,000 pair
javascript-v1-hard-negatives-100k train 100,000 hard-negatives
php-v1-pair-2M train 2,000,000 pair
php-v1-hard-negatives-100k train 100,000 hard-negatives
python-v1-pair-2M train 2,000,000 pair
python-v1-hard-negatives-100k train 100,000 hard-negatives
ruby-v1-pair-2M train 2,000,000 pair
ruby-v1-hard-negatives-100k train 100,000 hard-negatives

Quick usage 

from datasets import load_dataset

pair_ds = load_dataset("hotchpotch/cornstack-samples", "python-v1-pair-2M", split="train")
hard_ds = load_dataset("hotchpotch/cornstack-samples", "python-v1-hard-negatives-100k", split="train")

print(pair_ds.column_names, len(pair_ds))
print(hard_ds.column_names, len(hard_ds))

Creation process (rough)

For each language:

  1. Read CoRNStack shard files (shard-*.jsonl.gz).
  2. Count lines per shard and allocate per-shard targets.
  3. Build pair data via random line-index sampling with valid string query/document.
  4. Build hard-negative data from disjoint rows:
    • valid string query/document
    • negatives contains at least 7 unique non-empty strings
    • sample 7 negatives per row
    • cap output via reservoir sampling

Default seed is fixed (42) for reproducibility under identical source snapshots and parameters.

License

This dataset follows CoRNStack and is released under Apache-2.0.

Citation and attribution

If you use this dataset, please cite and attribute CoRNStack: