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Why jev-curate?

Cleaning 10M to 1B rows of synthetic reasoning data, instruction tuning pairs, or web-scraped corpora is an economic and technical nightmare:

• Generative LLMs are too slow and expensive: Running Claude 3.5 Sonnet or GPT-4o to judge synthetic rows costs $15,000–$50,000 per billion tokens and crawls at a painful 30–50 rows/sec.
• Regex heuristics are blind to reasoning flaws: Keyword and regex filters can check syntax, but fail to detect circular reasoning, hallucinated derivation steps, or robotic sycophancy.
• Context rot from uncompressed inputs: Naively feeding raw data into LLMs causes decision accuracy to crater while burning money on boilerplate text.

jev-curate solves this by piping Apache Arrow and Parquet streams through TypeSafe AI's Jev model (jev-1.13.0):

• Single-round-trip rubrics per row: Evaluates all rubric questions concurrently in one HTTP request per row via Jev's speculative parallel fan-out with zero per-question round-trips. Single-node throughput is bounded by TypeSafe's 1,200 req/min (20 rows/sec) limit; horizontal scaling across worker nodes targets 1,500+ rows/sec cluster throughput.
• ~$4.20 per 100M tokens: Jev bills $0.042/Mtok for input, zero for output. TypeSafe benchmarks System One workflows 444.6x cheaper and 193.6x faster than generative LLMs (source).
• Mathematical calibration: Receives calibrated probabilities (Noul), ordinal rubrics (Score on a 0 to 4 scale, sent as an ordered list), and categorical choices (Choice), eliminating generative text slop.
• Zero Rewriting: Emits clean records verbatim without rewriting or altering mathematical formulas.

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Quickstart

CLI (Rust Single Binary).

# Install via Cargo
cargo install jev-curate

# Set your TypeSafe AI key
export TYPESAFE_API_KEY="your-api-key"

# Filter a Parquet dataset using the math reasoning preset:
jev-curate filter train.parquet \
  --preset reasoning-math \
  --out ./output/ \
  --concurrency 32

Python API

PyO3 bindings (build from source with the python cargo feature):

git clone https://github.com/AkashPriyadarshii/jev-curate
cd jev-curate
maturin develop   # python feature auto-enabled via pyproject.toml

from jev_curate import PyJevCurator

curator = PyJevCurator(api_key="your-api-key", preset="reasoning-math")

PyJevCurator currently wraps the same filter pipeline as the CLI (see src/filter.rs); constructor-only for now. Use the CLI for row-level sifting.

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CLI Reference

jev-curate filter [OPTIONS] <INPUT_PATH>

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Presets

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Build & Test

# Rust core
cargo build --release
cargo test

# Python bindings (via maturin)
maturin develop
pytest

All tests run against an in-process mock server with zero live API credits in CI.

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Architecture

jev-curate/
├── Cargo.toml                 # Rust core manifest (arrow, parquet, tokio, pyo3, clap, reqwest, serde)
├── pyproject.toml             # Maturin Python package manifest
├── src/
│   ├── lib.rs                 # PyO3 module bindings & crate entry
│   ├── main.rs                # Standalone CLI binary entrypoint
│   ├── client.rs              # TypeSafe AI HTTP client (speculative fan-out)
│   ├── filter.rs              # Host-side sanity pruning & Jev pipeline
│   ├── parquet_io.rs          # Streaming Parquet/Arrow reader and writer
│   ├── rate_limiter.rs        # Adaptive token-bucket with auto 429 backoff
│   └── presets.rs             # Pre-built post-training evaluation rubrics
└── tests/
    └── mock_test.rs           # In-process mock tests via typesafe-rs-mock (100% offline)

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Non-Goals

1. Not a Generative Re-writer: jev-curate never paraphrases or re-generates text. Data is kept 100% verbatim.
2. Not a Heavy Local Vector DB: No embeddings, no vector indices, zero PyTorch/CUDA runtime requirements.
3. Not a Generic Web Scraper: Tailored strictly for structured datasets (Parquet, Arrow, JSONL).

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Mandatory Ecosystem, Author & Social Directory

Ecosystem

• jev-seo
• jev-superpowers
• jev-curate
• jev-git
• tdlib-android
• kharcha

Author

• Akash Priyadarshi (Patna, Bihar, India)
• GitHub • Portfolio • LinkedIn • Resume

Social

• X / Twitter • Threads • Instagram • Reddit

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Built with high-performance Rust for the TypeSafe AI System One (Jev) ecosystem.

Keywords: TypeSafe AI, Jev, api.typesafe.ai, System One, Choice, Score, Noul, dataset curation, synthetic data filtering, pretraining datasets, Parquet streaming, arrow, rust.