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https://arxiv.org/abs/2604.21203 [2604.21203] Refining Covariance Matrix Estimation in Stochastic Gradient Descent Through Bias... Abstract page for arXiv paper 2604.21203: Refining Covariance Matrix Estimation in Stochastic Gradient Descent Through Bias Reduction stochastic gradient descent covariance matrix 2604 21203 refining https://sandwich.R-Forge.R-project.org/ Robust Covariance Matrix Estimators • sandwich covariance matrix robust estimators sandwich https://sandwich.R-Forge.R-project.org/index.html Robust Covariance Matrix Estimators • sandwich covariance matrix robust estimators sandwich