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) doi:10.1111/j.2517-6161.1996.tb02080.x and Meinshausen and Buhlmann (2010) doi:10.1111/j.1467-9868.2010.00740.x.