Method and system for providing machine learning service

A method for providing machine learning model service, the method comprising:

• (a) generating, by a first computing system, a first output data using a first machine learning model, wherein the first machine learning model is trained on a first training dataset;
• (b) transmitting the first output data to a second computing system, wherein the first training dataset and the first machine learning model are inaccessible to the second computing system;
• (c) creating an input data by joining the first output data with a selected set of input features accessible to the second computing system;
• and
• (d) generating a second output data using a second machine learning model to process the input data, wherein the second machine learning model and the selected set of input features are inaccessible to the first computing system.