README.md

metadata

dataset_info:
  - config_name: bm25
    features:
      - name: query-id
        dtype: string
      - name: corpus-ids
        list: string
    splits:
      - name: go
        num_bytes: 578229
        num_examples: 50
      - name: java
        num_bytes: 865210
        num_examples: 50
      - name: javascript
        num_bytes: 631841
        num_examples: 50
      - name: php
        num_bytes: 683511
        num_examples: 50
      - name: python
        num_bytes: 673168
        num_examples: 50
      - name: ruby
        num_bytes: 635258
        num_examples: 50
    download_size: 669346
    dataset_size: 4067217
  - config_name: corpus
    features:
      - name: _id
        dtype: string
      - name: text
        dtype: string
    splits:
      - name: go
        num_bytes: 5866161
        num_examples: 10000
      - name: java
        num_bytes: 8383266
        num_examples: 10000
      - name: javascript
        num_bytes: 6817497
        num_examples: 6483
      - name: php
        num_bytes: 8308232
        num_examples: 10000
      - name: python
        num_bytes: 12057318
        num_examples: 10000
      - name: ruby
        num_bytes: 1456896
        num_examples: 2279
    download_size: 17919374
    dataset_size: 42889370
  - config_name: qrels
    features:
      - name: query-id
        dtype: string
      - name: corpus-id
        dtype: string
    splits:
      - name: go
        num_bytes: 11666
        num_examples: 50
      - name: java
        num_bytes: 17154
        num_examples: 50
      - name: javascript
        num_bytes: 12376
        num_examples: 50
      - name: php
        num_bytes: 13456
        num_examples: 50
      - name: python
        num_bytes: 13454
        num_examples: 50
      - name: ruby
        num_bytes: 12948
        num_examples: 50
    download_size: 61488
    dataset_size: 81054
  - config_name: queries
    features:
      - name: _id
        dtype: string
      - name: text
        dtype: string
    splits:
      - name: go
        num_bytes: 11803
        num_examples: 50
      - name: java
        num_bytes: 19923
        num_examples: 50
      - name: javascript
        num_bytes: 15444
        num_examples: 50
      - name: php
        num_bytes: 19306
        num_examples: 50
      - name: python
        num_bytes: 22227
        num_examples: 50
      - name: ruby
        num_bytes: 30739
        num_examples: 50
    download_size: 82419
    dataset_size: 119442
configs:
  - config_name: bm25
    data_files:
      - split: go
        path: bm25/go-*
      - split: java
        path: bm25/java-*
      - split: javascript
        path: bm25/javascript-*
      - split: php
        path: bm25/php-*
      - split: python
        path: bm25/python-*
      - split: ruby
        path: bm25/ruby-*
  - config_name: corpus
    data_files:
      - split: go
        path: corpus/go-*
      - split: java
        path: corpus/java-*
      - split: javascript
        path: corpus/javascript-*
      - split: php
        path: corpus/php-*
      - split: python
        path: corpus/python-*
      - split: ruby
        path: corpus/ruby-*
  - config_name: qrels
    data_files:
      - split: go
        path: qrels/go-*
      - split: java
        path: qrels/java-*
      - split: javascript
        path: qrels/javascript-*
      - split: php
        path: qrels/php-*
      - split: python
        path: qrels/python-*
      - split: ruby
        path: qrels/ruby-*
  - config_name: queries
    data_files:
      - split: go
        path: queries/go-*
      - split: java
        path: queries/java-*
      - split: javascript
        path: queries/javascript-*
      - split: php
        path: queries/php-*
      - split: python
        path: queries/python-*
      - split: ruby
        path: queries/ruby-*

🚧 This dataset is currently under construction. Specifications may change.

NanoCodeSearchNet (with bm25 subset)

A lightweight, evaluation-ready subset of CodeSearchNet, designed for fast code-retrieval benchmarking.

What this dataset is

• A code-retrieval benchmark with 6 programming-language splits: go, java, javascript, php, python, ruby.
• Each split contains 50 queries and up to 10,000 code snippets.
• Queries are function docstrings and positives are corresponding function bodies.

Data structure

• corpus: _id, text
• queries: _id, text
• qrels: query-id, corpus-id, score
• bm25: query-id, corpus-ids (A bm25 subset is included for first-stage retrieval and reranking experiments.)

Performance Comparison Across Models

Model	avg	Go	Java	JavaScript	PHP	Python	Ruby
bm25	0.4295	0.3644	0.3952	0.3308	0.2311	0.9552	0.3005
e5-small	0.7268	0.6805	0.7884	0.6386	0.6603	0.9142	0.6788
e5-large	0.7836	0.7595	0.8287	0.6942	0.7291	0.9513	0.7391
bge-m3	0.7107	0.6643	0.6934	0.6138	0.6229	0.9852	0.6844

Subset names

• Split names: go, java, javascript, php, python, ruby
• Config names: corpus, queries, qrels, bm25

BM25 tokenization strategy

• bm25 was generated with --auto-select-best-splitter.
• Candidate strategies: transformer, stemmer, wordseg, nltk_stem, nltk_stem_stop, english_regex, english_porter, english_porter_stop, whitespace.
• Selection metric: best nDCG@100 per split.

Selected strategy by split:

Split	Strategy	Details
go	transformer	tokenizer: Qwen/Qwen3-0.6B
java	transformer	tokenizer: Qwen/Qwen3-0.6B
javascript	transformer	tokenizer: Qwen/Qwen3-0.6B
php	transformer	tokenizer: Qwen/Qwen3-0.6B
python	transformer	tokenizer: Qwen/Qwen3-0.6B
ruby	transformer	tokenizer: Qwen/Qwen3-0.6B

Upstream source

• Original dataset: code-search-net/code_search_net
• Paper: CodeSearchNet Challenge (1909.09436)

License

Other. This dataset is derived from CodeSearchNet and follows upstream repository licensing and attribution requirements.