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We propose several sketching strategies , present a new quasi-Newton method that uses stochastic block BFGS updates combined with the variance reduction approach SVRG to compute batch stochastic gradients , and prove linear convergence of the resulting method .
 quasi-Newton method, batch stochastic gradients; stochastic block BFGS updates, quasi-Newton method; stochastic block BFGS updates, variance reduction approach SVRG; variance reduction approach SVRG, quasi-Newton method; linear convergence, method
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Answer:
 quasi-Newton method, batch stochastic gradients; stochastic block BFGS updates, quasi-Newton method; stochastic block BFGS updates, variance reduction approach SVRG; variance reduction approach SVRG, quasi-Newton method; linear convergence, method