Before revision:  Such amplification leads to substantially stronger privacy guarantees for systems in which data is contributed anonymously [BEMMRLRKTS17] and for the analysis of noisy stochastic gradient descent  .
After revision:  Such amplification leads to substantially stronger privacy guarantees for systems in which data is contributed anonymously [BEMMRLRKTS17] and for the analysis of noisy stochastic gradient descent CSUZZ19,EFMRTT19 .