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Reza2kn/
sapiens2-seg-0.4b-INT4-G128

facebook/sapiens2-seg-0.4b

quantized

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sapiens2-seg-0.4b INT4-G128

Packed 4-bit derivative of facebook/sapiens2-seg-0.4b.

This artifact uses symmetric per-group INT4 packing with group size 128 for large floating-point weight tensors. Norms, biases, positional/rope tensors, and small tensors are kept in their source dtype. It is a storage/runtime-loader quant for the current official Sapiens2 code path, not an AWQ/GGUF/NVFP4 LLM artifact.

Files

facebook__sapiens2-seg-0.4b-int4-g128.safetensors: packed INT4 safetensors artifact.
load_sapiens2_int4.py: loader that reconstructs a PyTorch state dict for the official Sapiens2 model code.
config.json and preprocessor_config.json: copied from the source repo.
quantization_report.json: build report.

Quantization Report

Source revision: b27f69ec02eda650a403e3d6f1b4cf2f0a81b6c0
Group size: 128
Source bytes: 1626406804
Artifact bytes: 211024020
Compression ratio: 7.7072x
Tensors: 424
Quantized tensors: 152
Max tensor MAE during dequant smoke: 0.01476995

Fidelity Validation

The packed INT4 artifact was dequantized back to floating-point tensors and compared against the source checkpoint.

Validation gate: global floating-tensor similarity >= 90.00%
Result: PASS
Global floating-tensor similarity: 99.360680%
Minimum large-tensor cosine: 0.989891112

Loading

python

from load_sapiens2_int4 import load_state_dict

state_dict = load_state_dict("facebook__sapiens2-seg-0.4b-int4-g128.safetensors", device="cpu")
# Then instantiate the matching official Sapiens2 architecture and load:
# model.load_state_dict(state_dict, strict=True)

Limitations

This is a verified packed-weight artifact with a dequantizing loader. It does not claim native INT4 CUDA kernels for Sapiens2 yet. Runtime speedups require a Sapiens2-specific kernel/export path and should be benchmarked separately.

Reza2kn/sapiens2-seg-0.4b-INT4-G128