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存问题[8-9]有些类似的地方.4) 人工智能法,如BP神经网络算法[10-11],SVM[12-13]和RNN LSTM[14]等方法.1个有效的预测模型将同时考虑目标序列过去的行为数据和近期某些特殊事件的影响,这些特殊值在备付金管理预测问题上具有重要意义,但是一般的时间序列算法将这些特殊点视为离群点被剔除掉,忽略了其对目标序列估值的作用.另外,经济时间序列预测中的"拐点"预测也是一个重要的研究......
J, WILSON BP, LUNDSTROM M. Selective reductive leaching of cobalt and lithium from industrially crushed waste Li-ion batteries in sulfuric acid system [J]. Waste Management, 2018, 76: 582-590. [32] LV......
模型的性能,本文另外单独构建了BP神经网络模型和广义回归网络模型,输入同样的数据对三个模型性能进行对比验证,采用测试集准确率及F1分数作为评估指标,实验结果表明,长短时记忆网络模型不论在预测准确率还是在F1分数均远高于传统机器学习模型,如图8所示. 图8 LSTM模型与传统模型性能对比 Fig. 8 Performance comparison between LSTM......
全连接神经网络.网络中除第一层(输入层)和最后一层(输出层)外,中间层(隐层)主要完成信号的加工与运算工作,网络架构如图3所示.为合理确定神经网络内各神经元的参数,采用误差逆传播(BP)算法进行计算.该算法可根据结果的反馈逐层前传,各神经元沿负梯度方向调整权重.为提高网络精度,可采用增加隐层数或/和增加神经元个数等来完成[17],但最合理的网络架构需经过模型比较来确定. 图3 神经网络的架构......
保证率的影响可以忽略,该联合供热系统应用在高密度建筑小区中能减少用地. 参考文献: [1] BRITISH PETROLEUM. Statistical review of world energy-all data, 1965-2019[EB/OL]. [2020-12-1]. https: //www.bp.com/content/dam/bp/business-sites/en/global/corporate/xlsx/energy-economics/statistical-review/bp-stats-review-2020-all-data.xlsx. [2] AL-WAELI A H A, KAZEM H A, CHAICHAN M T, et al. A review of photovoltaic thermal systems: achievements......
and the purified solution were measured. The organic solution was prepared by dissolving appropriate trialkyl amine (hereafter as N235) and TBP in 50% distilled kerosene (bp 165-190 ℃). The effect of HCl......
to the corresponding aligned regions of any of BLAST hit sequences were selected as potential probes. In this process, stretches of matches between aligned regions were considered. Probes with ＞15 bp matching......
, 2008, 15(5): 726-732. [17] LI Cun-bin, WANG Ke-cheng. A new grey forecasting model based on BP neural network and Markov chain [J]. Journal of Central South University of Technology, 2007, 14(5......
. The stability and robustness of the whole system can hardly be guaranteed, if the weights and parameters of the networks are adjusted by the traditional BP methods. So the methods based on Lyapunov......
showed that the amplified 18S rRNA was 1733 bp. Then, a comparative analysis was performed by Clustal X 1.8 and MEGA 3.1 software, which indicated that 18S rDNA gene sequence from strain HB-03 had......
