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

Sample .npy (NPY) Test Files & Edge Cases

Deterministic NumPy Array Binary Format 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-f32-4x8.npy

Real np.save output: '<f4' descriptor, C-contiguous order, 32 IEEE-754 float32 elements.

↓ Download (256 B)

SHA-256: fd4257fe798868b27cf704172e1220473164dad2866b833f7e8fd58060fad063

Exact: 256 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npy/minimal-f32-4x8.npy -o minimal-f32-4x8.npy \
  && echo "fd4257fe798868b27cf704172e1220473164dad2866b833f7e8fd58060fad063  minimal-f32-4x8.npy" | shasum -a 256 -c

realisticexpect: valid

embeddings-f64-8x16.npy

Double-precision '<f8' dense embedding matrix written by np.save.

↓ Download (1.1 KB)

SHA-256: d4d9449ca4484124d49b8a4d6aab51baf502d3a7b15f26441a38acb20ec4f81f

Exact: 1,152 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npy/embeddings-f64-8x16.npy -o embeddings-f64-8x16.npy \
  && echo "d4d9449ca4484124d49b8a4d6aab51baf502d3a7b15f26441a38acb20ec4f81f  embeddings-f64-8x16.npy" | shasum -a 256 -c

edge-caseFortran Order + NaN/Inf + Truncatedexpect: parser_error

fortran-nan-truncated.npy

Real np.save Fortran-order header declaring (32, 32) f4 with payload truncated after 6 floats — np.load must raise.

↓ Download (152 B)

SHA-256: 2fcb431d32fa5281d8f1e465105e015b209fcb619761b0407fa19adaaa4b35db

Exact: 152 bytes

curl -fsSL https://fileformat.co/fixtures/v1/npy/fortran-nan-truncated.npy -o fortran-nan-truncated.npy \
  && echo "2fcb431d32fa5281d8f1e465105e015b209fcb619761b0407fa19adaaa4b35db  fortran-nan-truncated.npy" | 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-f32-4x8.npy directly in your browser without hosting unsafe payloads on public URLs.

1. Base Input Source

Default Fixture: minimal-f32-4x8.npy

2. Select Mutation Operator

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