Model reuse-based model prediction

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• for each reusable prediction model of a plurality of reusable prediction models having the same model input features, determining a respective model weight, by (i) using the reusable prediction model to obtain a predicted label for a sample data set of a data owner, (ii) determining a prediction error of the reusable prediction model, based on difference between the predicted label and a real label for the sample data set of the data owner, and (iii) determining the respective model weight for the reusable prediction model, based on the prediction error of the reusable prediction model, wherein the reusable prediction model comprises a logistic regression model, and a model parameter of the reusable prediction model is a model parameter matrix;
• after determining the respective model weights, for each reusable prediction model of the plurality of reusable prediction models, (i) using the reusable prediction model to obtain a respective predicted label for to-be-predicted vector data of the data owner, by performing secure computing on the reusable prediction model and the to-be-predicted vector data, between a device of the data owner and a device of an owner of the reusable prediction model, to obtain a vector product of the model parameter of the reusable prediction model and the to-be-predicted vector data, and (ii) calculating an activation function of the vector product as the respective predicted label of the reusable prediction model;
• and
• determining the predicted label for the to-be-predicted vector data of the data owner, based on each respective predicted label of each reusable prediction model and the respective model weight of each reusable prediction model.

A computer-implemented system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• for each reusable prediction model of a plurality of reusable prediction models having the same model input features, determining a respective model weight, by (i) using the reusable prediction model to obtain a predicted label for a sample data set of a data owner, (ii) determining a prediction error of the reusable prediction model, based on difference between the predicted label and a real label for the sample data set of the data owner, and (iii) determining the respective model weight for the reusable prediction model, based on the prediction error of the reusable prediction model, wherein the reusable prediction model comprises a logistic regression model, and a model parameter of the reusable prediction model is a model parameter matrix;
• after determining the respective model weights, for each reusable prediction model of the plurality of reusable prediction models, using the reusable prediction model to obtain a respective predicted label for to-be-predicted vector data of the data owner, by performing secure computing on the reusable prediction model and the to-be-predicted vector data, between a device of the data owner and a device of an owner of the reusable prediction model, to obtain a vector product of the model parameter of the reusable prediction model and the to-be-predicted vector data, and (ii) calculating an activation function of the vector product as the respective predicted label of the reusable prediction model;
• and
• determining the predicted label for the to-be-predicted vector data of the data owner, based on each respective predicted label of each reusable prediction model and the respective model weight of each reusable prediction model.