Memory device and operation method thereof

A memory device for implementing an Artificial Neural Network (ANN), the memory device including:

• a memory array, for storing respective weight matrix of a plurality of layers of the ANN;
• and
• a controller coupled to the memory array,
• the controller being configured for:
• reading from the memory array a weight matrix of a current layer of the ANN to extract a plurality of neuro values;
• determining whether to perform calibration;
• when the controller determines to perform calibration, recalculating and updating a mean value and a variance value of the neuro values;
• and
• performing batch normalization based on the mean value and the variance value of the neuro values.