Questions on the bias tracker?

In the knowledge center, it is said:
pair of gyro bias trackers “ML_LEARN_BIAS_FROM_TEMPERATURE” and “ML_BIAS_FROM_TEMPERATURE” allow the Embedded MotionApps Platform to create and use a mapping gyro bias to temperature, using the ML_BIAS_FROM_NO_MOTION tracker to discover gyro bias and the IMU/MPU’s built in temperature sensor to determine temperature. The mapping of gyro bias to temperature will stay constant [1] throughout the lifetime of the part, so a bias, once learned, can be used to calibrate the gyro at any time it is at that temperature. When ML_LEARN_BIAS_FROM_TEMPERATURE is active, the Embedded....


I want to konw how to use the bias trackers. Are they defined in Embedded MotionApps SDK or where? I can't find them.