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Low rank approximation is an effective method in deep neural network (DNN) compression. In view of the fact that the redundancy information content of different network layers is different, a novel iterative low-rank approximation method based on the redundancy of each network layer is proposed. By giving priority to the network layer with higher redundancy, the loss of intrinsic information in each network layer is expected to be reduced and the performance of the compressed model is improved. Experimental results show that the performance of compressed model obtained by this method is improved with a slight reduction in compression ratio. It can be concluded that the proposed method can better retain intrinsic information in the pre-training network.

In view of the pollution problem of toxic and harmful sewage discharge from enterprises in benxi section of the upper reaches of taizi river, the typical pollution sources of benxi section were investigated and the pollutants in benxi section were measured.The comprehensive scoring method based on the potential hazard method was used to select 8 factors suitable for the selection of benxi section of taizi river and assign weights to them.Screen out 13 kinds of poisonous and harmful pollutants for benxi section of the optimal control of pollutants.It provides the index basis for monitoring the water quality of the benxi section of taizi river and water risk accidents.

This paper optimizes the operation mode of the combined drainage channel box sluice in H river basin of a city in south China to solve the problem of frequent sluice opening.Based on the InfoWorks ICM software, the hydraulic model of drainage system of the river basin was established, the measured rainfall and liquid level were screened, the model parameters were determined by using the rainfall data of medium and heavy rain, and the model was verified by using the rainfall data of heavy rain. The optimal liquid level is obtained by analyzing and comparing the simulation results. The simulation results are basically consistent with the actual precipitation.After optimization, the optimal liquid level of the combined drainage channel box sluice gate increased by 0.8m compared with the manually operated maximum liquid level. After the operation mode of sluice is optimized, the annual sluice opening times are reduced by 78%. After the experience, the InfoWorks ICM hydraulic model has high reliability, and the optimal sluice opening liquid level can be obtained through simulation analysis, which can more effectively prevent waterlogging and reduce river pollution.