35results about How to "Implement Stratified Sampling" patented technology

The embodiment of the invention provides a model training method and device, a computer storage medium and equipment. The method comprises the steps of obtaining at least two sample data sets, wherein the difficulty ratios in sample data included in the at least two sample data sets are different; respectively training at least two preset models through the at least two sample data sets to obtain at least two training models; and carrying out model fusion on the at least two training models to obtain a target model. Therefore, by adopting the at least two sample data sets with different difficulty ratios, layered sampling of the sample data is realized, so that the prediction effect of the finally obtained target model can be improved; moreover, the at least two sample data sets are utilized to perform model training, and then the target model is obtained through model fusion, so that the generalization ability of the target model is improved.

The invention discloses an artificial wetland miniature simulation test device for accurately grasping uniformly-collected water and an internal mechanism, consisting of a water distribution device, artificial miniature simulation test blocks (quadruple blocks) and filler filling and sampling columns, wherein the water distribution device distributes water to the artificial miniature simulation test blocks and can ensure that the concentration of raw water in four test block boxes is consistent and the water inlet flow can be controlled according to the design ratio; and the different water outlet flows can be adjusted by each drain pipe. The artificial miniature simulation test blocks are used for filling filler, planting plants and the like so as to stimulate the composition of the artificial wetland, wherein the water level of the artificial miniature simulation test blocks can be adjusted and water samples can be taken out from four blocks. The filler filling and sampling columns are arranged in the test blocks (a plurality of sampling columns can be arranged in each test block) so as to realize the layered sampling of the filler. The artificial wetland miniature simulation test device can be used for investigating the parameter design and the treatment effect of the vertical current artificial wetland and designing and optimizing the vertical current artificial wetland and can realize the four-level simulation comparison of certain parameter under the same filler condition, the simulation comparison of four fillers under the same parameter condition as well as the layered sampling of the fillers.

The invention provides a multi-directional accurate thickness measurement and sampling device suitable for wax deposits on the surface of cold fingers, including a fixed support, a support rod, a positioning cone, a clamping ring, a rotating support rod and a measuring tool, and the bottom end of the support rod Installed on the fixed support, the upper part of the pole fixes the clamping ring, the clamping ring clamps the cold finger, the center of the bottom end of the cold finger is against the tip of the positioning cone, the positioning cone is installed on the fixed support, and the rotating pole One end is slidingly connected with the clamping ring, and the other end of the rotating support rod is connected with the measuring tool. The invention is used for fixing the cold fingers with wax deposits on the surface and performing multi-directional accurate measurement and sampling on them. Accurate thickness measurement of wax deposits on the surface of cold fingers can be realized. At the same time, the scale can be used for reading reference, and layered sampling of deposits of different thicknesses can be carried out.

A transmission network risk assessment method considering the influence of substations. The method first collects the reliability parameter data of the regional power grid and the internal components of each substation and the basic parameter data of the internal relay protection of the substation; then establishes the Marko of the internal components of the power grid and the substation The state model and the hidden fault model of relay protection are used to determine the occurrence probability of each state of components and relay protection; then the improved non-sequential Monte Carlo simulation method is used to sample the system state; finally, the load shedding based on DC power flow is adopted The optimization model analyzes the load loss risk of the system state, calculates the risk index of the transmission network, and evaluates the risk of the transmission network according to the risk index. The invention can reflect the influence of the substation on the risk assessment of the transmission network to the greatest extent, further improves the accuracy and real-time performance of the risk assessment on the premise of satisfying the calculation accuracy, and can provide reliable basis for the grid operators to understand the real-time risks of the grid.

The invention discloses a multi-point vinasse sampler and a sampling method. The multi-point vinasse sampler comprises a bottom section sampling rod, at least one middle section sampling rod and an upper portion handle which are sequentially and detachably connected from bottom to top; a bottom section rod sampling cavity is formed in the bottom section sampling rod; a bottom section rod sampling opening communicated with the bottom section rod sampling cavity is formed in the outer wall of the bottom section sampling rod; a middle section rod sampling cavity is formed in the middle section sampling rod; a middle section rod sampling opening communicated with the middle section rod sampling cavity is formed in the outer wall of the middle section sampling rod. The sampling method is a method using the multi-point vinasse sampler to sample vinasse. A worker only needs one set of the multi-point vinasse sampler to finish layered sampling operation on different-depth fermented grains by installing the appropriate number of middle section sampling rods. According to the multi-point vinasse sampler and the sampling method, sampling is convenient, and the device cost is low.