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È¥ÄêͶÁËIEEE Transactions on Knowledge and Data Engineering£¬Ò»Éó»¨ÁËÒ»Ä꣬review 1 ¸øµÄreject£¬ ÎÒ¾õµÃ¾ø´ó²¿·ÖÒâ¼û¶¼ÊÇ´íµÄ£¬ÓÐЩÎÒרÃÅÓÃÁËÒ»Õ½ڽéÉÜ£¬ÓÐЩÎÒ¸ù±¾Ã»×ö¹ýÄÇЩ¼ÙÉ裬 ÓÐЩÊǺÜÕý³£µÄ³£Ê¶£¬ËùÒÔºÜÆø·ß£¬¸Ð¾õÍêÈ«²»×ðÖØ±ðÈ˵ijɹû¡£ÎÒ½ÓÏÂÀ´Ìù³öreview 1 µÄÒâ¼ûºÍÎҵļòµ¥µÄrebuttal£¬ ÏëÒª´ó¼Ò°ïÎÒ¿´¿´ÉêÊöµÄ¿ÉÄÜÐÔ¡£»¹ÓÐÏëÎÊÎÊÓÐûÓÐÈËÏòTKDEÉêÊö¹ý¡£ The issues of this paper are discussed as below: 1. This paper claims that the trading behavior is a function of data cost. But they just take 1(accept), 0(otherwise) into consideration, which do not show any practical correlation with data cost. This contribution is weak and limited. Rebuttal: trading behavior Ö¸µÄÊÇÂô(0)»òÕß²»Âô(1), ûÓÐÆäËû¿ÉÄÜ£¬trading behavior ¶¼¿ÉÒÔformulate³Édata cost µÄÒ»¸öfunctionÁË£¬ËûÃÇÖ®¼ä»¹Ã»ÓÐcorrelationô£¿ 2.Compared with the previous works, the authors not only protect the data¡¯ but also protect the trading behaviors¡¯ privacy under LDP framework. However, since the trading behaviors only have two kinds of results 1(accept), 0(otherwise), the real trading behaviors can be obtained by the collectors after trades. Rebuttal: ´ÓÀ´Ã»ÓÐreveal real trading behaviours, Ò»Ö±revealµÄ,sellersÖ´ÐеͼÊÇperturbed trading decision¡£ 3.The assumption 1 does not always hold since the data may be in a high dimensional space. And PCA cannot ensure any loss in information when projecting the high dimensional data into a lower dimensional space. Rebuttal£ºPCA ²»¾ÍÊÇÕâ¸öÓô¦Ã´£¿±£³Ö90%»òÒÔÉϵÄvariance £¨Õâ¾ÍÊDZ£ÕÏûÓÐloss in information£© ͬʱ¼õÉÙ data dimension 4.In order to obtain the unbiased gradient for the data collector, the authors show us that the data owners should provide two auxiliary parameters, which is calculated by the biased gradient, with the collector. Firstly, what is physical meaning of these two parameters? Why the data owners provides these two kinds of information to help collector guess their real data cost? Rebuttal£ºÒòΪÄãÒªdata owners ÒªÂôËûµÄdata°¡£¬ÒªÌṩauxiliary parametersÊÇÄãÂôdataµÄǰÌáÒªÇó°¡£¬ºÎ¿öÌṩÁËauxiliary parametersÄãµÄdata Ò²±»LDP±£»¤ 5.Subsection 4.1 states that the data owners perturb the data by using the perturbed gradient. But why is directly perturbing the raw data inapplicable? The authors should attempt to use their designed algorithm to learn real data cost from the perturbed data instead of redesigning a data perturbation method fitting the pricing rule to help learn the real data cost. Rebuttal: Ϊʲô²»Ö±½ÓÓÃÒѾÔÚÎÄÕÂÀïÃæµ¥¶ÀÁÐÁ˸ösection˵ÁË£¬Ò»°ãµÄlearning algorithm over perturbed data¶¼»á¶ÔÕâ¸öperturbed data×öһЩ¼ÙÉ裬±ÈÈç·ûºÏʲô·Ö²¼£¬ÔõôperturbedµÄ£¬ÎÒÕâÆªÎÄÕ¾ͼÙÉèperturbed dataÊÇ´ÓÎÒÕâ¸öperturbed scheme Éú²ú³öÀ´µÄ²»ÐÐô£¿ 6.In Algorithm 2, there is an assumption that the price follows uniform distribution U[0,2]. There is no reference and explanation to support this assumption. Rebuttal:¸ù±¾Ã»Õâ¸ö¼ÙÉ裡£¡£¡ In Eq(1), the pricing rule is published with the help of two parameters ϵ,¦Ä. Is it reasonable for the data collector to get the value of ϵ,¦Ä ? Rebuttal£ºϵ,¦ÄÊÇdata collectorÉèÖõģ¬ÎªÉ¶Ëû²»ÖªµÀ£¿ In experiments, Fig.6 is so confusing. There is only one computation time for one trading in practice. Why the authors the CDF of computation time for one trading? Rebuttal£ºÒòΪÕû¸ölearning algorithmµÄgradients ¶¼ÊÇrandomized£¬¶øÇÒ¼ÆËãgradients»¹ÓÃÁËexternal library£¬ÎÒ×ö1000 trails£¬È»ºó»cdf²»ÊǺÜÕý³£Ã´£¿ |
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