C/C++实现手写数字识别的示例详解

#define TrainingDataNum 50000	
#define TestDataNum 8000		
#define FeatureNum 784    //28*28	
#define ClassNum 10
#define FileMaxCol 40    //大于28
#define K 3
 
//……………………
 
struct DisAndLabel
{
	int distance;
	int classLabel;
};
 
bool Cmp(const DisAndLabel& a, const DisAndLabel& b)
{
	return a.distance < b.distance;
}
 
int FileToTrainingDataArray(int** pTrainingDataFeture, int* pTrainingDataClass, int tid);
int FileToTestDataArray(int** pTestDataFeture, int* pTestDataClass, int tid);
void ClassifyTest(int** pTestDataFeture, int** pTrainingDataFeture, int* pTestDataClass, int* pTrainingDataClass, int tid);
 
//……………………
 
int main()
{
	clock_t t1, t2, t3, t4, t5;
	t1 = clock();
 
	int** pTrainingDataFeture = new int* [TrainingDataNum];
	if (pTrainingDataFeture == NULL)
	{
		exit(-1);
	}
 
	for (int i = 0; i < TrainingDataNum; i++)
	{
		pTrainingDataFeture[i] = new int[FeatureNum + 1];
		if (pTrainingDataFeture[i] == NULL)
		{
			exit(-1);
		}
	}
	
	//……………………
 
	t2 = clock();
	double duration = (double(t2) - double(t1)) / CLOCKS_PER_SEC;
	cout << "分配内存：" << duration << "秒" << endl;
	
	//……………………
 
	thread td[10];
 
	for (int tid = 0; tid < 10; tid++)
	{
		td[tid] = thread(&FileToArrayThread, pTrainingDataFeture, pTrainingDataClass, pTestDataFeture, pTestDataClass, tid);
	}
 
	for (int tid = 0; tid < 10; tid++)
	{
		td[tid].join();
	}
	
	//……………………
	
	int errorCountTotal = 0;
 
	for (int i = 0; i < 10; i++)
	{
		errorCountTotal += errorCount[i];
	}
 
	cout << "*********************************************************" << endl;
	cout << "测试集测试结果：" << endl;
	cout << "k=" << K << endl;
	cout << "测试集样本个数：" << TestDataNum << endl;
	cout << "预测错误个数：" << errorCountTotal << endl;
	cout << "错误率：" << double(errorCountTotal * 100.0 / TestDataNum) << "%" << endl;
	cout << "正确率：" << 100.0 - double(errorCountTotal * 100.0 / TestDataNum) << "%" << endl;
	//cout << "*********************************************************" << endl;
 
	t4 = clock();
	duration = (double(t4) - double(t3)) / CLOCKS_PER_SEC;
	cout << "*********************************************************" << endl;
	cout << "8000个样本预测准确率分析：" << duration << "秒" << endl;
 
	duration = (double(t4) - double(t1)) / CLOCKS_PER_SEC;
	cout << "*********************************************************" << endl;
	cout << "总共用时：" << duration << "秒" << endl;
	
	//……………………
}