Unified IG

Unified IG provides one small, SHAP-like API for Integrated Gradients across model families. The first implementation supports closed-form attributions for scikit-learn linear models and multilayer perceptrons.

import unifiedig as uig

explainer = uig.Explainer(model, baseline)
explanation = explainer(X)

For numerical backends, the quadrature resolution is configurable:

explainer = uig.Explainer(model, baseline, n_steps=128)

Explanation is lightweight and has SHAP-compatible fields. SHAP remains an optional dependency; call explanation.to_shap() to use its plotting tools.

Installation

During development, install the project and its test dependencies with:

python -m pip install -e ".[test]"

Output semantics

For regression, attributions sum to the difference between the prediction and the baseline prediction. Binary classifiers are explained on their decision-score (logit) scale; probability attributions are not part of V1. See docs/semantics.md for the complete array-shape and output contract.

Supported models

sklearn.linear_model.LinearRegression (closed form)
Binary sklearn.linear_model.LogisticRegression (closed form)
sklearn.neural_network.MLPRegressor (analytic gradients and quadrature)
Binary sklearn.neural_network.MLPClassifier (analytic logit gradients and quadrature)

Development

Run the tests and validate distribution artifacts with:

pytest
python -m build
python -m twine check dist/*

See CONTRIBUTING.md for the development workflow.

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