Gradient Descent LASSO with Stability Selection and Bootstrapped Confidence Intervals

Implements LASSO regression using gradient descent with support for Gaussian, Binomial, Negative Binomial, and Zero-Inflated Negative Binomial (ZINB) families. Features cross-validation for determining lambda, stability selection, and bootstrapping for confidence intervals. Methods described in Tibshirani (1996) and Meinshausen and Buhlmann (2010) .