pt-loader
Safe parser-based PyTorch checkpoint converter to safetensors with both Rust and Python APIs.
Active Development Notice
pt-loader is under active development. During v0.1.x, we may introduce breaking API and behavior changes in both Rust and Python interfaces without backward-compatibility guarantees.
Features
- Parses torch zip
.ptcheckpoints with strict safety limits. - Converts checkpoints to
model.safetensors+model.yaml. - Inspects checkpoint metadata and tensor summaries.
- Loads tensors directly into Python as NumPy arrays.
Installation
Python
Install from PyPI:
pip install pt-safe-loader
Install from source (local repo):
uv sync --group dev
uv run maturin develop --features pyo3
Rust
Add dependency:
[dependencies]
pt-loader = "0.1"
Python Usage
Example:
from pt_loader import PtCheckpoint
ckpt = PtCheckpoint.load("samples/yolo26n.pt")
print(ckpt.metadata()["tensor_count"])
result = ckpt.export(format="safetensors", dir="out")
print(result["weights_path"])
tensors = ckpt.state_dict(backend="numpy")
print(next(iter(tensors.values())).shape)
Rust Usage
use pt_loader::{ExportFormat, ExportOptions, LoadOptions, PtCheckpoint};
use std::path::Path;
let input = "samples/yolo26n.pt";
let ckpt = PtCheckpoint::load(input, LoadOptions::default())?;
let result = ckpt.export("out", ExportOptions::new(ExportFormat::Safetensors, Some(Path::new(input))))?;
println!("{}", result.weights_path.display());
Development
cargo test
cargo check --features pyo3
uv run pytest -q
1 maintainer
Metadata
1 maintainer
Release files for pt-safe-loader 0.1.4
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| pt_safe_loader-0.1.4.tar.gz | 39.4 kB | With provenance | Details for pt_safe_loader-0.1.4.tar.gz |
Built distributions (wheels)
| File | Interpreter | ABI | Platform | Actions Reset |
|---|---|---|---|---|
| pt_safe_loader-0.1.4-cp38-abi3-win_amd64.whl | CPython 3.8 | abi3 | Windows x86-64 | Details for pt_safe_loader-0.1.4-cp38-abi3-win_amd64.whl |
| pt_safe_loader-0.1.4-cp38-abi3-manylinux_2_34_x86_64.whl | CPython 3.8 | abi3 | Linux glibc 2.34+ x86-64 | Details for pt_safe_loader-0.1.4-cp38-abi3-manylinux_2_34_x86_64.whl |
| pt_safe_loader-0.1.4-cp38-abi3-macosx_11_0_arm64.whl | CPython 3.8 | abi3 | macOS 11.0+ ARM64 | Details for pt_safe_loader-0.1.4-cp38-abi3-macosx_11_0_arm64.whl |
Total release size: 1.7 MB
Release files / pt_safe_loader-0.1.4.tar.gz
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| Tags | CPython 3.8 Windows x86-64 abi3 |
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| Tags | CPython 3.8 Linux glibc 2.34+ x86-64 abi3 |
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