Matrix multiplication device and operation method thereof

An operation method of a matrix multiplication device, the matrix multiplication device being configured to multiply a first matrix by a second matrix to produce a product matrix, the operation method comprising:

• producing, by a plurality of first calculation circuits, a plurality of first multiply-accumulate values in a first column of the product matrix;
• receiving, by a control circuit, a plurality of first element values in a column of the first matrix during a first period;
• classifying, by the control circuit, the first element values into at least one first classification value;
• controlling, by the control circuit, the first calculation circuits to operate in a low power mode when a first classification quantity of the at least one first classification value is less than or equal to a first classification threshold;
• controlling, by the control circuit, the first calculation circuits to operate in a normal mode when the first classification quantity is greater than the first classification threshold;
• respectively multiplying, by a multiplication circuit, the at least one first classification value by a second element value in a row of the second matrix in the low power mode to obtain at least one first product value;
• and
• transmitting, by a routing circuit, each of the at least one first product value to at least one corresponding calculation circuit in the first calculation circuits in the low power mode.

A matrix multiplication device configured to multiply a first matrix by a second matrix to produce a product matrix, the matrix multiplication device comprising:

• a plurality of calculation circuits configured to produce a plurality of first multiply-accumulate values in a first column of the product matrix, wherein the calculation circuits comprise at least one first calculation circuit and at least one second calculation circuit;
• a control circuit configured to receive a plurality of first element values in a column of the first matrix during a first period, wherein the control circuit classifies the first element values into at least one first classification value, the control circuit controls the calculation circuits to operate in a low power mode when a first classification quantity of the at least one first classification value is less than or equal to a first classification threshold, the at least one first calculation circuit multiplies the at least one first classification value by a second element value in a first column of the second matrix in the low power mode to obtain at least one first product value, and the control circuit controls the calculation circuits to operate in a normal mode when the first classification quantity is greater than the first classification threshold;
• and
• a routing circuit coupled to the at least one first calculation circuit to receive the at least one first product value, wherein the routing circuit transmits each of the at least one first product value to at least one corresponding calculation circuit in the calculation circuits in the low power mode.