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README.md
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# jepa.cpp parity fixtures
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PyTorch golden reference dumps for [**jepa.cpp**](https://github.com/aselimc/jepa.cpp), a ggml-based
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against per-family thresholds.
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Generated from jepa.cpp `main` @ [`
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`scripts/dump_reference.py --model all`, in float32 eval mode on 32 CPU threads, no autocast
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torch 2.13.0+cpu, transformers 5.16.1.
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## Contents
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| directory | model |
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| `ref/ijepa-vith14-1k/` | I-JEPA ViT-H/14 |
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| `ref/lejepa-vits16/` | LeJEPA ViT-S/16 |
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| `ref/
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| `ref/
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| `ref/vjepa2-vitl-fpc16-256-ssv2/` | V-JEPA 2 ViT-L SSv2 classifier |
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| `ref/
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| `ref/
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156 files,
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## Layout
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One directory per model, each with a `manifest.json` and one `.npy` per tensor per sample, named
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`<sample>.<tensor>.npy`. All arrays are float32 C-order except `frames_u8` (uint8) and `top5_idx`
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(int64). Shapes carry no batch dimension except `input`, which is stored exactly as fed to the model
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(batch = 1).
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The manifest records the model id, the
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`source` field is the absolute path of the checkout that generated the dump.
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Per-model tensor lists and the exact preprocessing recipe:
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[**docs/fixtures.md**](https://aselimc.github.io/jepa.cpp/fixtures/).
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## How jepa.cpp consumes it
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scripts/download_fixtures.sh # this dataset -> tests/fixtures/ref, plus the media it needs
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scripts/download_models.sh small # GGUFs from https://huggingface.co/jepacpp
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cmake -S . -B build && ctest --test-dir build # parity suites register
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```
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A single replay, without ctest:
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```bash
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build/test-parity models/gguf/lejepa-vits16-pretrain-in1k-f16.gguf \
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tests/fixtures/ref/lejepa-vits16 --threads 32 --json out.json
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```
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`test-parity` runs two passes per file: first the stored `input` tensor (bypassing preprocessing, so a
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| input | source | fetched by |
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| 8 images `coco_*.jpg` | [COCO val2017](https://cocodataset.org/), images subject to their original Flickr terms | tracked in the jepa.cpp git repo |
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| 6 clips
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The `input` and `frames_u8` arrays inside `ref/` are preprocessed pixels of those
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[github.com/aselimc/jepa.cpp](https://github.com/aselimc/jepa.cpp/issues).
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## Licence
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`cc-by-nc-4.0`, the most restrictive licence among the checkpoints whose outputs are stored here:
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[galilai-group/LeVJEPA-VideoMix-Large](https://huggingface.co/galilai-group/LeVJEPA-VideoMix-Large));
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the other five directories are outputs of MIT / Apache-2.0 models. Research and non-commercial use.
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## Regenerating instead of downloading
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```bash
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scripts/download_fixtures.sh
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scripts/download_models.sh all
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.venv/bin/python scripts/dump_reference.py --model all
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```
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Needs the project venv (torch CPU, transformers, av, pillow, timm, einops).
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## Links
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- Code: <https://github.com/aselimc/jepa.cpp>
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# jepa.cpp parity fixtures
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PyTorch golden reference dumps for [**jepa.cpp**](https://github.com/aselimc/jepa.cpp), a ggml-based C/C++ inference engine for the
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JEPA family. `tests/test-parity` and `tests/test-predictor` replay these tensors through the engine and
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gate per-token cosine, pooled outputs and classifier top-1/top-5 against per-family thresholds.
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Generated from jepa.cpp `main` @ [`3c9d60b`](https://github.com/aselimc/jepa.cpp/commit/3c9d60b) with
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`scripts/dump_reference.py --model all`, in float32 eval mode on 32 CPU threads, no autocast.
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## Contents
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| directory | model | files | size |
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|---|---|---:|---:|
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| `ref/ijepa-vith14-1k/` | I-JEPA ViT-H/14 (IN1k) | 25 | 15 MB |
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| `ref/lejepa-vits16/` | LeJEPA ViT-S/16 (IN1k) | 41 | 7 MB |
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| `ref/levjepa-vitl16/` | LeVJEPA ViT-L/16 (VideoMix) | 21 | 136 MB |
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| `ref/lewm-pusht/` | LeWorldModel Push-T | 20 | 3 MB |
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| `ref/vjepa2-vitl-fpc16-256-ssv2/` | V-JEPA 2 ViT-L/16 SSv2 classifier | 13 | 56 MB |
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| `ref/vjepa2-vitl-fpc64-256/` | V-JEPA 2 ViT-L/16 (fpc64, 256) | 21 | 366 MB |
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| `ref/vjepa2_1-vitb-384/` | V-JEPA 2.1 ViT-B/16 @384 | 15 | 107 MB |
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156 files, 691 MB in total.
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## Layout
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One directory per model, each with a `manifest.json` and one `.npy` per tensor per sample, named
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`<sample>.<tensor>.npy`. All arrays are float32 C-order except `frames_u8` (uint8) and `top5_idx`
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(int64). Shapes carry no batch dimension except `input`, which is stored exactly as fed to the model.
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The manifest records the model id, the hyper-parameters, the preprocessing pipeline that produced
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`input`, the PyTorch forward wall time per sample (`timing_s.forward_s`, the baseline for the speed
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tables of the jepa.cpp docs), the frame indices sampled from each clip, and the label strings for the
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classifier. Per-model tensor lists and the exact preprocessing recipe:
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[**docs/fixtures.md**](https://aselimc.github.io/jepa.cpp/fixtures/).
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## How jepa.cpp consumes it
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scripts/download_fixtures.sh # this dataset -> tests/fixtures/ref, plus the media it needs
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scripts/download_models.sh small # GGUFs from https://huggingface.co/jepacpp
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cmake -S . -B build && ctest --test-dir build # the parity suites register at configure time
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```
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`test-parity` runs two passes per file: first the stored `input` tensor (bypassing preprocessing, so a
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| input | source | fetched by |
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|---|---|---|
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| 8 images `coco_*.jpg` | [COCO val2017](https://cocodataset.org/), images subject to their original Flickr terms | tracked in the jepa.cpp git repo |
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| 6 short clips | [`nateraw/kinetics-mini`](https://huggingface.co/datasets/nateraw/kinetics-mini), a small sample of Kinetics-400 | `scripts/download_fixtures.sh` |
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The `input` and `frames_u8` arrays inside `ref/` are preprocessed pixels of those images and clips, kept
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because the parity tests must feed the network exactly the tensor PyTorch saw. If you hold rights in any
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of the underlying material and want it removed, open an issue on [github.com/aselimc/jepa.cpp](https://github.com/aselimc/jepa.cpp/issues).
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## Licence
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`cc-by-nc-4.0`, the most restrictive licence among the checkpoints whose outputs are stored here: the
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dumps of I-JEPA ViT-H/14 (IN1k) and LeVJEPA ViT-L/16 (VideoMix) are outputs of CC BY-NC 4.0 models, the rest of MIT / Apache-2.0 ones.
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Research and non-commercial use.
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## Regenerating instead of downloading
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```bash
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scripts/download_fixtures.sh media # the source media
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scripts/download_models.sh --convert all # the source checkpoints
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.venv/bin/python scripts/dump_reference.py --model all # ~1 min on 32 cores
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```
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## Links
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- Code: <https://github.com/aselimc/jepa.cpp>
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