Machine learning system and machine learning method

A machine learning system comprising:

• a host device configured to store and update a host model one or multiple times;
• and
• a plurality of client devices configured to be communicatively coupled to the host device and receive the host model, wherein each of the plurality of client devices is configured to train the received host model according to a corresponding one of a plurality of parameter sets to generate a training result;
• wherein
• the host device stores a plurality of round numbers respectively corresponding to the plurality of client devices, and when the host device receives the training result of one of the plurality of client devices, the host device updates a corresponding one of the plurality of round numbers, wherein
• in an i-th update that the host device conducts to the host model, when a difference between a maximum and a minimum of the plurality of round numbers is not larger than a threshold value, and the host device does not receive the training result transmitted from one of the plurality of client devices corresponding to the minimum of the plurality of round numbers, the host device updates the host model according to the training results that are received in the i-th update, and i is a positive integer.

A machine learning method comprising:

• transmitting a host model, by a host device, to a plurality of client devices, wherein the host device is configured to store and update the host model one or multiple times;
• training the host model, by each of the plurality of client devices, according to a corresponding parameter set to generate a training result;
• and
• updating, by the host device, a corresponding one of a plurality of round numbers respectively corresponding to the plurality of client devices and stored in the host device when the host device receives the training result of one of the plurality of client devices;
• wherein in an i-th update that the host device conducts to the host model, when a difference between a maximum and a minimum of the plurality of round numbers is not larger than a threshold value, and the host device does not receive the training result transmitted from one of the plurality of client devices corresponding to the minimum of the plurality of round numbers, the host device updates the host model according to the training results that are received in the i-th update, wherein i is a positive integer.