.npz QA Fixtures AI & Model Weights CC0 Public Domain · CI/CD Safe

Sample .npz (NPZ) Test Files & Edge Cases

Deterministic NumPy Zipped Array Archive fixtures engineered for automated unit tests, parser fuzzing, and upload validation pipelines. Pull directly in GitHub Actions with immutable SHA-256 verification.

minimalexpect: valid

minimal-weights.npz

Real np.savez output containing weights.npy (4x8 float32) and bias.npy (8 float32).

↓ Download (668 B)

SHA-256: 5df985f2575c4c4a1f58f21970bd74830b277688976534283c269be2ccfb2637

Exact: 668 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npz/minimal-weights.npz -o minimal-weights.npz \
  && echo "5df985f2575c4c4a1f58f21970bd74830b277688976534283c269be2ccfb2637  minimal-weights.npz" | shasum -a 256 -c

realisticexpect: valid

checkpoint-deflated.npz

Real np.savez_compressed bundle with float32, float64, and int32 arrays.

↓ Download (1.1 KB)

SHA-256: 1da30aadf475322bd6b9df64d90d6fda4f4e600251c6c542bcca7c2a0d8a39ca

Exact: 1,151 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npz/checkpoint-deflated.npz -o checkpoint-deflated.npz \
  && echo "1da30aadf475322bd6b9df64d90d6fda4f4e600251c6c542bcca7c2a0d8a39ca  checkpoint-deflated.npz" | shasum -a 256 -c

edge-caseTruncated ZIP EOCDexpect: parser_error

truncated-eocd.npz

Valid PK local headers but missing complete EOCD — np.load on the archive must raise.

↓ Download (654 B)

SHA-256: 3d8d77b9c97b839f497301ec2cbfb8fd34e7c19ae6e0f7ddee51c864c7eb05f5

Exact: 654 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npz/truncated-eocd.npz -o truncated-eocd.npz \
  && echo "3d8d77b9c97b839f497301ec2cbfb8fd34e7c19ae6e0f7ddee51c864c7eb05f5  truncated-eocd.npz" | shasum -a 256 -c

Safe-by-Design Client-Side Synthesizer

In-Browser Edge-Case & Malformed Fixture Mutator

Zero Upload · Generated in RAM

Need negative test fixtures for parser fuzzing or upload gateway validation? Mutate minimal-weights.npz directly in your browser without hosting unsafe payloads on public URLs.

1. Base Input Source

Default Fixture: minimal-weights.npz

2. Select Mutation Operator

Tests graceful EOF / footer corruption handling without process panic or OOM.