WO2020233259A1 - 一种基于多中心模式下随机森林算法的特征重要性排序系统 - Google Patents
一种基于多中心模式下随机森林算法的特征重要性排序系统 Download PDFInfo
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- WO2020233259A1 WO2020233259A1 PCT/CN2020/083589 CN2020083589W WO2020233259A1 WO 2020233259 A1 WO2020233259 A1 WO 2020233259A1 CN 2020083589 W CN2020083589 W CN 2020083589W WO 2020233259 A1 WO2020233259 A1 WO 2020233259A1
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- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
- G06F18/211—Selection of the most significant subset of features
- G06F18/2113—Selection of the most significant subset of features by ranking or filtering the set of features, e.g. using a measure of variance or of feature cross-correlation
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- the invention belongs to the technical field of feature selection, and particularly relates to a feature importance ranking system based on a random forest algorithm in a multi-center mode.
- Feature selection is the process of selecting some of the most effective features from a set of features to reduce the dimensionality of the feature space. Feature selection can reduce the number of features, reduce dimensionality, make the model stronger, reduce over-fitting, and enhance the understanding of features and feature values. This is one of the key issues in the field of data science. In the field of biomedicine, it is often necessary to process high-dimensional data such as omics data sets, where the number of variables is usually much larger than the number of individuals. In this case, the significance of feature selection is particularly important. Random forest is an ensemble learning algorithm that is widely used in the field of biomedicine. It can provide estimates of the importance of variables in the classification process and is considered an effective feature selection algorithm.
- Multi-center data collaborative computing is an application scenario that appears in the context of big data. It refers to a group in a geographically dispersed state that uses computer and network technology to cooperate with each other to complete a task. Feature selection based on multi-center data is one of the important issues. In the context of big data, the demand for collaborative computing of data in various centers is increasing.
- the purpose of the present invention is to provide a feature importance ranking system based on the random forest algorithm in the multi-center mode in accordance with actual needs and without exposing the data of each center.
- the data is always in each center, and only the intermediate parameters of the model are transmitted to the central server, and the original data is not transmitted. Finally, a safe and effective global feature importance ranking result is obtained.
- a feature importance ranking system based on random forest algorithm in multi-center mode the system includes: front-end processors deployed in each center participating in collaborative computing; receiving and integrating The central server for the ranking results of the importance of each central feature; the result display module that feeds back the final feature importance ranking results to the user.
- the front end processor is used to read data from the database interface of each center, and use the random forest algorithm to calculate the characteristic importance ranking result of the center.
- the specific calculation steps are as follows:
- steps B-C a total of q times, where q is the number of decision trees in the random forest;
- Gini index as an evaluation indicator to sort the prediction results of step E by feature importance, including the following sub-steps:
- GI m represents the Gini index of node m before the branch
- GI l and GI r represent the Gini indices of the two new nodes l and r after the branch respectively
- the calculation formula of the Gini index is:
- K indicates that there are K categories, and p xk indicates the proportion of category k in node x;
- the central server calculating the global feature importance ranking result includes the following sub-steps:
- the present invention is based on a multi-center random forest algorithm, and the feature importance ranking results are calculated in each center respectively; the central server integrates the ranking results of each center to form a global feature importance ranking result.
- the present invention does not expose the data of each center, the data of each center in the system is always in the center, only the intermediate parameters of the model are transmitted to the central server, and the original data is not transmitted, which effectively guarantees data security and the individuals included in the data privacy.
- Figure 1 is a flowchart of the implementation of the feature importance ranking system based on the random forest algorithm in the multi-center mode of the present invention
- FIG. 2 is a block diagram of the feature importance ranking system based on the random forest algorithm in the multi-center mode of the present invention
- Figure 3 is a flowchart of the importance of features in each center's front end
- Figure 4 is a flowchart of the global importance ranking in the central server.
- the present invention provides a feature importance ranking system based on the random forest algorithm in a multi-center mode.
- the system includes: front-end processors deployed in each center participating in collaborative computing; receiving and integrating each The central server of the central feature importance ranking result; the result display module that feeds back the final feature importance ranking result to the user.
- the front end processor is used to read data from the database interface of each center, and use the random forest algorithm to calculate the feature importance ranking result of the center, as shown in Figure 3, the specific calculation steps are as follows:
- steps B-C a total of q times, where q is the number of decision trees in the random forest;
- Gini index as an evaluation indicator to sort the prediction results of step E by feature importance, including the following sub-steps:
- GI m represents the Gini index of node m before the branch
- GI l and GI r represent the Gini indices of the two new nodes l and r after the branch respectively
- the calculation formula of the Gini index is:
- K indicates that there are K categories, and p xk indicates the proportion of category k in node x;
- the central server calculates the global feature importance ranking result, as shown in FIG. 4, including the following sub-steps:
- the following is a specific example, which shows a feature importance ranking system based on the random forest algorithm in the multi-center mode to predict the risk of diabetes from the physical examination data.
- the system includes: deployment in each hospital participating in collaborative computing The front-end processor; the central server that receives and integrates the feature importance ranking results of each hospital; the result display module that feeds the final feature importance ranking results back to the user.
- the front-end processor is used to read the physical examination data from the database interface of each hospital, and use the random forest algorithm to predict the risk of diabetes, and calculate the ranking result of the importance of the risk of diabetes in the hospital.
- the specific calculation steps are as follows:
- Gini index as an evaluation indicator to sort the prediction results of step E by feature importance, including the following sub-steps:
- GI m represents the Gini index of node m before the branch
- GI l and GI r represent the Gini indices of the two new nodes l and r after the branch respectively
- the calculation formula of the Gini index is:
- K indicates that there are K categories, and p xk indicates the proportion of category k in node x;
- the calculation of the global feature importance ranking result in the physical examination data that affects the risk of diabetes in the central server includes the following sub-steps:
- the present invention calculates the local variable importance ranking based on the Gini index at each site and sends it to the central server.
- the central server integrates the variable importance ranking of each site and calculates the final ranking result.
- the central server only receives the variable importance ranking results of each site, and does not need to exchange patient-level data. This not only obtains an effective global solution, but also effectively guarantees the security of the data, which provides security for the construction of feature screening models. Reliable and efficient solution.
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Abstract
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Claims (1)
- 一种基于多中心模式下随机森林算法的特征重要性排序系统,其特征在于,该系统包括:部署在参与协同计算的各中心的前置机;接收并整合各中心特征重要性排序结果的中心服务器;将最终特征重要性排序结果反馈给用户的结果展示模块。所述前置机用于从各中心的数据库接口读取数据,并利用随机森林算法计算本中心的特征重要性排序结果,具体计算步骤如下:A.从本中心数据库接口读取数据作为样本集;B.用有抽样放回的方法(bootstrap)从样本集中随机选取n个样本作为一个训练集;C.用抽样得到的训练集生成一颗决策树;在决策树的每一个结点,均随机不重复地选择d个特征,利用这d个特征分别对训练集进行划分;D.重复步骤B-C共q次,q即为随机森林中决策树的个数;E.用训练得到的随机森林对样本集进行预测;F.利用基尼指数作为评价指标对步骤E的预测结果进行特征重要性排序,包括以下子步骤:其中,GI m表示分枝前节点m的基尼指数,GI l和GI r分别表示分枝后两个新节点l和r的基尼指数;基尼指数的计算公式为:其中,K表示有K个类别,p xk表示节点x中类别k所占的比例;e)对所有特征归一化后的基尼指数评分进行降序排序。所述中心服务器计算全局特征重要性排序结果,包括以下子步骤:A.接收各中心传来的特征重要性排序结果;B.对于每个特征,求得该特征在所有中心的基尼指数评分的平均值作为全局性特征重要性值;C.按照全局性特征重要性值由大到小的顺序,对特征进行重新排序。
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| JP7064681B2 (ja) | 2022-05-11 |
| CN110728291B (zh) | 2022-02-22 |
| JP2022508333A (ja) | 2022-01-19 |
| CN110728291A (zh) | 2020-01-24 |
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