# 手动计算矩阵乘法 倒数第三段漏了一行代码: stop_time = time.time # 结束时刻 <img width="1364" height="1046" alt="Image" src="https://github.com/user-attachments/assets/aaef38c6-9aae-4ba1-bfd8-79681cbba2ee" />