noiseSigma property

This is a single float value and will be used to add noise to all the features. Use this field when all features are normalized to have the same distribution: scale to range 0, 1, -1, 1 or z-scoring, where features are normalized to have 0-mean and 1-variance. Learn more about normalization.

For best results the recommended value is about 10% - 20% of the standard deviation of the input feature. Refer to section 3.2 of the SmoothGrad paper: https://arxiv.org/pdf/1706.03825.pdf. Defaults to 0.1.

If the distribution is different per feature, set feature_noise_sigma instead for each feature.