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一、梯度检测： 对于函数而言通常有两种计算梯度的方式： １.数值梯度 (numberical gradient) ２.解析梯度 (analytic gradient ) 数值梯度计算通常为： 更为常见的是： h是一个很小的数，在实际当中通常为1e-5 假设数值梯度为ƒ’a 解析梯度为ƒ’n ，则数值 阅读全文
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对于CNN输入的数据，常见的有三种处理方式： 1.Mean subtraction. 将数据的每一维特征都减去平均值。在numpy 中 X -= np.mean(X, axis = 0) 2.Normalization 归一化数据，使数据在相同尺度。 在numpy 中 X /= np.std(X, 阅读全文
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继承自QObject 的Qt类都具有支持信号和槽的能力，并且在子类的实现代码中直接使用connect()函数pwdLineEdit->setEchoMode(QLineEdit::Password);QLineEdit::Normal 默认显示方式，显示用户实际输入的内容QLineEdit::Password 用*号代替输入内容QLineEdit::NoEcho 不显示输入任何内容QLineEdit::PasswordEchoOnEdit 仅仅用户在行编辑框里编辑文本时才显示用户输入的字符，完成后以*号代替输入的内容QGridLayout::addWidget(Line,0,0,1,1) 阅读全文
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1050. String Subtraction (20)时间限制10 ms内存限制32000 kB代码长度限制16000 B判题程序StandardGiven two strings S1 and S2, S = S1 - S2 is defined to be the remaining string after taking all the characters in S2 from S1. Your task is simply to calculate S1 - S2 for any given strings. However, it might not be that simpl 阅读全文
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1020. Tree Traversals (25)时间限制400 ms内存限制32000 kB代码长度限制16000 B判题程序Standard作者CHEN, YueSuppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to output the level order traversal sequence of the corresponding binar 阅读全文
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1013. Battle Over Cities (25)时间限制400 ms内存限制32000 kB代码长度限制16000 B判题程序Standard作者CHEN, YueIt is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the highways from/toward that city are closed. We must know immediately if we need to repair a 阅读全文
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1012. The Best Rank (25)时间限制400 ms内存限制32000 kB代码长度限制16000 B判题程序Standard作者CHEN, YueTo evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Language, M - Mathematics (Calculus or Linear Algrbra), and E - English. At the mean 阅读全文
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1009. Product of Polynomials (25) 时间限制 400 ms 内存限制 32000 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue 时间限制 400 ms 时间限制 400 ms 内存限制 32000 kB 内存限制 32000 阅读全文
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1003. Emergency (25)时间限制400 ms内存限制32000 kB代码长度限制16000 B判题程序Standard作者CHEN, YueAs an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some roads. Amount of rescue teams in each city and the length of each road bet 阅读全文
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1038. Recover the Smallest Number (30)时间限制400 ms内存限制32000 kB代码长度限制16000 B判题程序Standard作者CHEN, YueGiven a collection of number segments, you are supposed to recover the smallest number from them. For example, given {32, 321, 3214, 0229, 87}, we can recover many numbers such like 32-321-3214-0229-87 or 阅读全文