Computer-readable recording medium storing detection program, detection method, and detection device

A detection method comprising:

• inputting a plurality of pieces of second data into a second machine learning model generated by machine learning based on a plurality of pieces of first data and a first result output from a first machine learning model according to an input of the plurality of pieces of first data;
• acquiring a second result output from the second machine learning model according to the input of the plurality of pieces of second data;
• and
• detecting a difference between a distribution of the plurality of pieces of first data and a distribution of the plurality of pieces of second data, based on comparison between a value calculated based on the second result and a gradient of a loss function of the second machine learning model with a threshold.

A detection device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• input a plurality of pieces of second data into a second machine learning model generated by machine learning based on a plurality of pieces of first data and a first result output from a first machine learning model according to an input of the plurality of pieces of first data;
• acquire a second result output from the second machine learning model according to the input of the plurality of pieces of second data;
• and
• detect a difference between a distribution of the plurality of pieces of first data and a distribution of the plurality of pieces of second data, based on comparison between a value calculated based on the second result and a gradient of a loss function of the second machine learning model with a threshold.