一、什么是特征工程
机器学习领域的大神Andrew Ng(吴恩达)老师说“Coming up with features is difficult, time-consuming, requires expert knowledge. “Applied machine learning” is basically feature engineering. ” 注:业界广泛流传:数据和特…
外部时钟,主频64M
定时器1 通道1发出PWM波 频率1K 定时器2 通道1输入捕获,上升沿触发 串口 /* USER CODE BEGIN 0 */
uint32_t time_up_num0;//上升沿计数
float time_frequency;//频率
/* USER CODE END 0 */ 初始换打开定时器
/* USER CODE BEGIN 2 …