def draw_line(zeroArray, C): notZeroRow = np.where(np.sum(zeroArray == 1, axis=1) == 0)[0] deletaZeroColumn = np.where(zeroArray[notZeroRow] == -1)[1] notZeroRow = np.concatenate((notZeroRow, np.where(np.isin(zeroArray[:, deletaZeroColumn], 1))[0])) '划线操作' lineListRow = np.setdiff1d(np.arange(zeroArray.shape[0]), notZeroRow) lineListColumn = deletaZeroColumn findMin = np.copy(C) findMin[lineListRow, :] = 100000 findMin[:, lineListColumn] = 100000 minIndex = np.unravel_index(np.argmin(findMin), findMin.shape) C[notZeroRow, :] -= findMin[minIndex[0], minIndex[1]] for i in notZeroRow: negatives = np.where(C[i, :] < 0)[0] if negatives.size > 0: C[:, negatives] += findMin[minIndex[0], minIndex[1]] return C 添加注释

def add_new_restriction(matrix): new_column = np.zeros(matrix.shape[0]+1) new_line = np.zeros(matrix.shape[1]) new_column[-1] = -1 #这里简单使用第一行约束条件为基础生成新约束条件。 new_line = matrix[1, :] for index in range(0, len(new_line)): number = np.array(new_line[index], dtype=float) if number.tolist().is_integer() == False: new_line[index] = math.floor(new_line[index]) matrix = np.insert(matrix, matrix.shape[0], new_line, axis=0) matrix = np.insert(matrix, -1, new_column, axis=1) return matrix这个代码怎么用

new_line = np.zeros(matrix.shape[1]) new_column[-1] = -1 new_line = matrix[1, :] for index in range(0, len(new_line)): number = np.array(new_line[index], dtype=float) if number.tolist().is_...

def _load_rml(self, npy_file): data = np.load(npy_file, allow_pickle=True) data = np.expand_dims(data, axis=0)/255.0解释代码

- data = np.expand_dims(data, axis=0)：将数据的维度扩展一维，变成一个4维张量，第一维为1，因为此处只加载了一个数据。 - /255.0：将像素值归一化到[0,1]的范围内。最终得到的data是一个形状为(1, H, W...

def accuracy(self, x, t, batch_size=100): if t.ndim != 1 : t = np.argmax(t, axis=1) acc = 0.0 for i in range(int(x.shape[0] / batch_size)): tx = x[ibatch_size:(i+1)batch_size] tt = t[ibatch_size:(i+1)batch_size] y = self.predict(tx, train_flg=False) y = np.argmax(y, axis=1) acc += np.sum(y == tt) return acc / x.shape

t = np.argmax(t, axis=1) acc = 0.0 for i in range(int(x.shape[0] / batch_size)): tx = x[i*batch_size:(i+1)*batch_size] tt = t[i*batch_size:(i+1)*batch_size] y = self.predict(tx, train_flg=...

class NeuralNetwork: def init(self, input_dim, hidden_dim, output_dim): self.input_dim = input_dim self.hidden_dim = hidden_dim self.output_dim = output_dim self.weights1 = np.random.randn(input_dim, hidden_dim) self.bias1 = np.zeros((1, hidden_dim)) self.weights2 = np.random.randn(hidden_dim, output_dim) self.bias2 = np.zeros((1, output_dim)) def relu(self, x): return np.maximum(0, x) def relu_derivative(self, x): return np.where(x >= 0, 1, 0) def forward(self, x): self.z1 = np.dot(x, self.weights1) + self.bias1 self.a1 = self.relu(self.z1) self.z2 = np.dot(self.a1, self.weights2) + self.bias2 self.y_hat = self.z2 return self.y_hat def backward(self, x, y, learning_rate): error = self.y_hat - y delta2 = error delta1 = np.dot(delta2, self.weights2.T) * self.relu_derivative(self.a1) grad_weights2 = np.dot(self.a1.T, delta2) grad_bias2 = np.sum(delta2, axis=0, keepdims=True) grad_weights1 = np.dot(x.T, delta1) grad_bias1 = np.sum(delta1, axis=0) self.weights2 -= learning_rate * grad_weights2 self.bias2 -= learning_rate * grad_bias2 self.weights1 -= learning_rate * grad_weights1 根据代码加上损失函数

grad_bias1 = np.sum(delta1, axis=0) self.weights2 -= learning_rate * grad_weights2 self.bias2 -= learning_rate * grad_bias2 self.weights1 -= learning_rate * grad_weights1 self.bias1 -= learning_...

class Logistic_Regression: def init(self, lr_rate = 0.01, max_iter = 100000, tol = 1e-2 ): self.lr_rate = lr_rate self.max_iter = max_iter self.tol = tol self.w = None def preprocessing(self, x): row = x.shape[0] y = np.ones(row).reshape(row, 1) x_prepro = np.hstack((x, y)) return x_prepro def sigmoid(self, x): return 1 / (1 + np.exp(-x)) def fit(self, x_train, y_train): X = self.preprocessing(x_train) y = y_train.T self.w = np.array([[0] * X.shape[1]], dtype = float) k = 0 for loop in range(self.max_iter): z = np.dot(X, self.w.T) grad = X * (y - self.sigmoid(z)) grad = grad.sum(axis = 0) if (np.abs(grad) < self.tol).all(): break else: self.w += self.lr_rate * grad k += 1 print("最终的迭代次数为：".format(k)) print("最终的梯度为：".format(grad)) print("最终的权重为：".format(self.w[0])) return self.w[0] def predict(self, x): p = self.sigmoid(np.dot(self.preprocessing(x), self.w.T )) print("Y = 1的概率被估计为：{}".format(p[0][0])) p[np.where(p > 0.5)] = 1 p[np.where(p < 0.5)] = 0 return p def score(self, x, y): y_c = self.predict(x) error_rate = np.sum(np.abs(y_c - y.T)) / y_c.shape[0] return 1 - error_rate

其中，预处理方法将输入的x矩阵增加一列全为1的列，sigmoid函数是逻辑回归中的激活函数，拟合方法使用梯度下降法来更新权重，预测方法将输入的x矩阵预处理后，使用训练好的权重来计算Y=1的概率，并将概率大于0.5的...

def svm_loss(x, y): N = x.shape[0] correct_class_scores = x[np.arange(N), y] margins = np.maximum(0, x - correct_class_scores[:, np.newaxis] + 1.0) margins[np.arange(N), y] = 0 loss = np.sum(margins) / N num_pos = np.sum(margins > 0, axis=1) dx = np.zeros_like(x) dx[margins > 0] = 1 dx[np.arange(N), y] -= num_pos dx /= N return loss, dx def softmax_loss(x, y): probs = np.exp(x - np.max(x, axis=1, keepdims=True)) probs /= np.sum(probs, axis=1, keepdims=True) N = x.shape[0] loss = -np.sum(np.log(probs[np.arange(N), y])) / N dx = probs.copy() dx[np.arange(N), y] -= 1 dx /= N return loss, dx

SVM损失函数的实现中，首先计算出正确标签的得分(correct_class_scores)，然后计算出每个样本的margin(间隔)，$margins = max(0, x - correct_class_scores[:, np.newaxis] + 1.0)$。如果margin大于0，则样本被分类...

# coding: utf-8 import numpy as np def identity_function(x): return x def step_function(x): return np.array(x > 0, dtype=np.int) def sigmoid(x): return 1 / (1 + np.exp(-x)) def sigmoid_grad(x): return (1.0 - sigmoid(x)) * sigmoid(x) def relu(x): return np.maximum(0, x) def relu_grad(x): grad = np.zeros(x) grad[x>=0] = 1 return grad def softmax(x): if x.ndim == 2: x = x.T x = x - np.max(x, axis=0) y = np.exp(x) / np.sum(np.exp(x), axis=0) return y.T x = x - np.max(x) # 溢出对策 return np.exp(x) / np.sum(np.exp(x)) def mean_squared_error(y, t): return 0.5 * np.sum((y-t)**2) def cross_entropy_error(y, t): if y.ndim == 1: t = t.reshape(1, t.size) y = y.reshape(1, y.size) # 监督数据是one-hot-vector的情况下，转换为正确解标签的索引 if t.size == y.size: t = t.argmax(axis=1) batch_size = y.shape[0] return -np.sum(np.log(y[np.arange(batch_size), t] + 1e-7)) / batch_size def softmax_loss(X, t): y = softmax(X) return cross_entropy_error(y, t)

这是一个包含各种常用神经网络函数的 Python 代码。其中 identity_function 表示恒等函数，step_function 表示阶跃函数，sigmoid 和 sigmoid_grad 表示 sigmoid 函数及其导数，relu 和 relu_grad 表示 ReLU 函数及其...

for it in range(len(data_sum)): mx = data_sum.max(axis=0).max(axis=0).max(axis=0) data_sum[it, 0, :, :, :] = np.array(data_sum) / mx

具体来说，代码中的for循环遍历了data_sum数组的每个元素，并将该数组中的三个维度（即第1、2、3个维度）的最大值取出来，然后使用np.array(data_sum) / mx将data_sum数组中的每个元素都除以该最大值。...

import numpy as np import pandas as pd import xlrd import os import matplotlib.pyplot as plt def get_all_fill_paths(dir_path): file_paths = [] for root, _, files in os.walk(dir_path): for file in files: file_paths.append(os.path.join(root, file)) return file_paths dir_path = r'C:\Users\lxz15\Desktop\电流数据2' file_paths = get_all_fill_paths(dir_path) data = pd.DataFrame() # 定义一个空的 DataFrame all_a = [] for i, file_path in enumerate(file_paths): df = pd.read_excel(file_path) for j in range(0, 1): for k in range(0, 1): a = pd.DataFrame(df.iloc[2 + 3 * k:5 + 3 * k, 7 + j].values) # 将列表转换为 DataFrame data = pd.concat([data, a], axis=1) # 将 a 添加到 data 中 all_a.append(a) all_a = np.array(all_a) all_a = np.where(np.char.isdigit(all_a.astype(str)), all_a, np.nan) all_a_avg = np.nanmean(all_a, axis=(0, 1)) # 计算平均数 diff = all_a - all_a_avg # 计算差 diff_sum = np.nansum(np.square(diff)) # 计算差的平方和 diff_sqrt = np.nansqrt(diff_sum) print("差的平方和的平方根为：", diff_sqrt)怎么把所有数据类型改成一样的

你可以使用Pandas的astype()函数将整个DataFrame中的数据类型转换为同一类型。比如，将所有数据转换为浮点数类型可以使用以下代码： python data = data.astype(float) 如果你的数据中有缺失值，可以使用...

class KNearestNeighbor(object): def init(self): pass def train(self, X, y): self.X_train = X self.y_train = y def predict(self, X, k=1): num_test = X.shape[0] num_train = self.X_train.shape[0] dists = np.zeros((num_test, num_train)) d1 = -2 * np.dot(X, self.X_train.T) d2 = np.sum(np.square(X), axis=1, keepdims=True) d3 = np.sum(np.square(self.X_train), axis=1) dist = np.sqrt(d1 + d2 + d3) y_pred = np.zeros(num_test) for i in range(num_test): dist_k_min = np.argsort(dist[i])[:k] y_kclose = self.y_train[dist_k_min] y_pred[i] = np.argmax(np.bincount(y_kclose.tolist())) return y_pred注释每一行代码

d2 = np.sum(np.square(X), axis=1, keepdims=True) # 计算测试数据集中每个数据的平方和 d3 = np.sum(np.square(self.X_train), axis=1) # 计算训练数据集中每个数据的平方和 dist = np.sqrt(d1 + d2 + d3) # ...

将 numpy 导入为 NP 导入熊猫作为 PD 导入 XLRD 导入操作系统导入 Matplotlib.pyplot 作为 plt def get_all_fill_paths（dir_path）： file_paths = [] 对于根， _， os.walk（dir_path）中的文件：对于文件中的文件： file_paths.append（os.path.join（root， file））返回 file_paths dir_path = r'C：\Users\lxz15\Desktop\电流数据2' file_paths = get_all_fill_paths（dir_path） data = pd.DataFrame（） # 定义一个空的 DataFrame all_a = [] for i， file_path in enumerate（file_paths）： df = pd.read_excel（file_path） for j in range（0， 1）： for k in range（0， 1）： a = pd.DataFrame（df.iloc[2 + 3 * k：5 + 3 * k， 7 + j].values） # 将列表转换为 DataFrame data = pd.concat（[data， a]， axis=1） # 将 a 添加到 data 中 all_a.append（a） all_a = np.array（all_a） all_a = np.where（np.char.isdigit（all_a.astype（str））， all_a， np.nan） all_a_avg = np.nanmean（all_a， axis=（0， 1）） # 计算平均数 diff = all_a - all_a_avg # 计算差 diff_sum = np.nansum（np.square（diff）） # 计算差的平方和 diff_sqrt = np.nansqrt（diff_sum） print（“差的平方和的平方根为：”， diff_sqrt）把数据类型改成一样的代码

all_a = np.where(np.char.isdigit(all_a.astype(str)), all_a, np.nan) all_a = all_a.astype(float) # 将所有数据转换为浮点数类型 all_a_avg = np.nanmean(all_a, axis=(0, 1)) # 计算平均数 diff = all_a - all...

import numpy as np from sklearn.datasets import load_iris from sklearn.model_selection import train_test_split import matplotlib.pyplot as plt # 加载 iris 数据 iris = load_iris() # 只选取两个特征和两个类别进行二分类 X = iris.data[(iris.target==0)|(iris.target==1), :2] y = iris.target[(iris.target==0)|(iris.target==1)] # 将标签转化为 0 和 1 y[y==0] = -1 # 将数据集分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 实现逻辑回归算法 class LogisticRegression: def init(self, lr=0.01, num_iter=100000, fit_intercept=True, verbose=False): self.lr = lr self.num_iter = num_iter self.fit_intercept = fit_intercept self.verbose = verbose def __add_intercept(self, X): intercept = np.ones((X.shape[0], 1)) return np.concatenate((intercept, X), axis=1) def sigmoid(self, z): return 1 / (1 + np.exp(-z)) def loss(self, h, y): return (-y * np.log(h) - (1 - y) * np.log(1 - h)).mean() def fit(self, X, y): if self.fit_intercept: X = self.__add_intercept(X) # 初始化参数 self.theta = np.zeros(X.shape[1]) for i in range(self.num_iter): # 计算梯度 z = np.dot(X, self.theta) h = self.sigmoid(z) gradient = np.dot(X.T, (h - y)) / y.size # 更新参数 self.theta -= self.lr * gradient # 打印损失函数 if self.verbose and i % 10000 == 0: z = np.dot(X, self.theta) h = self.sigmoid(z) loss = self.__loss(h, y) print(f"Loss: {loss} \t") def predict_prob(self, X): if self.fit_intercept: X = self.__add_intercept(X) return self.__sigmoid(np.dot(X, self.theta)) def predict(self, X, threshold=0.5): return self.predict_prob(X) >= threshold # 训练模型 model = LogisticRegressio

accuracy = np.sum(y_pred == y_test) / y_test.shape[0] print(f"Accuracy: {accuracy}") # 可视化 plt.scatter(X_test[:, 0], X_test[:, 1], c=y_pred) plt.show() 请问这段代码实现了什么功能？

import numpy as np import pandas as pd import xlrd import os import matplotlib.pyplot as plt def get_all_fill_paths(dir_path): file_paths = [] for root, _, files in os.walk(dir_path): for file in files: file_paths.append(os.path.join(root, file)) return file_paths dir_path = r'C:\Users\lxz15\Desktop\电流数据2' file_paths = get_all_fill_paths(dir_path) data = pd.DataFrame() # 定义一个空的 DataFrame all_a = [] for i, file_path in enumerate(file_paths): df = pd.read_excel(file_path) for j in range(0, 1): for k in range(0, 1): a = pd.DataFrame(df.iloc[2 + 3 * k:5 + 3 * k, 7 + j].values) # 将列表转换为 DataFrame data = pd.concat([data, a], axis=1) # 将 a 添加到 data 中 all_a.append(a) all_a = np.array(all_a) print(all_a) all_a = np.where(np.char.isdigit(all_a.astype(float)), all_a, np.nan) all_a = all_a.astype(float) all_a_avg = np.nanmean(all_a, axis=(0, 1)) print(all_a_avg) # 计算平均数 diff = all_a - all_a_avg print(diff) # 计算差 diff_sum = np.nansum(np.square(diff)) print(diff_sum) # 计算差的平方和 diff_sqrt = np.sqrt(diff_sum) # 计算平方根 print(diff_sqrt)怎么改

根据错误信息 TypeError: string operation on non-string array，可以确定问题出现在 all_a = np.where(np.char.isdigit(all_a.astype(float)), all_a, np.nan) 这一行代码上，因为 np.char.isdigit() 用于...

import numpy as np import pandas as pd import xlrd import os import matplotlib.pyplot as plt def get_all_fill_paths(dir_path): file_paths = [] for root, _, files in os.walk(dir_path): for file in files: file_paths.append(os.path.join(root, file)) return file_paths dir_path = r'C:\Users\lxz15\Desktop\电流数据2' file_paths = get_all_fill_paths(dir_path) data = pd.DataFrame() # 定义一个空的 DataFrame all_a = [] for i, file_path in enumerate(file_paths): df = pd.read_excel(file_path) for j in range(0, 1): for k in range(0, 1): a = pd.DataFrame(df.iloc[2 + 3 * k:5 + 3 * k, 7 + j].values) # 将列表转换为 DataFrame data = pd.concat([data, a], axis=1) # 将 a 添加到 data 中 all_a.append(a) all_a = np.array(all_a, dtype=float) print(all_a) all_a = np.where(np.char.isdigit(all_a.astype(str)), all_a, np.nan) # all_a = all_a.astype(float) all_a_avg = np.nanmean(all_a, axis=(0, 1)) print(all_a_avg) # 计算平均数 diff = all_a - all_a_avg print(diff) # 计算差 diff_sum = np.nansum(np.square(diff)) print(diff_sum) # 计算差的平方和 diff_sqrt = np.sqrt(diff_sum) # 计算平方根 print(diff_sqrt)怎么改

all_a = np.where(np.char.isdigit(all_a.astype(str)), all_a, np.nan) all_a_avg = np.nanmean(all_a, axis=(0, 1)) print(all_a_avg) diff = all_a - all_a_avg print(diff) diff_sum = np.nansum(np....

import numpy as np import random from scipy import stats import pandas as pd import matplotlib.pyplot as plt np.random.seed(1) a=[] for p in range(1,11): k=8 n=100 Sigma = [[1,0.6+0.04p],[0.6+0.04p,1]] res1 = [] for i in range(1,1001): data=np.random.multivariate_normal(np.zeros(2), Sigma, n) X_data=data[:,0] Y_data=data[:,1] Sx=sorted(X_data) Sy=sorted(Y_data) inter_x=np.arange(min(X_data),max(X_data)+(max(X_data)-min(X_data))/k, (max(X_data)-min(X_data))/k) inter_y=np.arange(min(Y_data),max(Y_data)+(max(Y_data)-min(Y_data))/k, (max(Y_data)-min(Y_data))/k) left_inter_x=np.dot(np.ones((n,1)),inter_x[0:k].reshape(1,k)) right_inter_x=np.dot(np.ones((n,1)),inter_x[1:(k+1)].reshape(1,k)) left_inter_y=np.dot(np.ones((n,1)),inter_y[0:k].reshape(1,k)) right_inter_y=np.dot(np.ones((n,1)),inter_y[1:(k+1)].reshape(1,k)) Data1=np.dot(X_data.reshape(n,1), np.ones((1,k))) Data2=np.dot(Y_data.reshape(n,1), np.ones((1,k))) frequx=(left_inter_x<=Data1)(Data1<right_inter_x) frequy=(left_inter_y<=Data2)(Data2<right_inter_y) frequxy = np.dot(frequx.astype(int).T,frequy.astype(int)) pi=np.sum(frequxy,axis=0)/n pj=np.sum(frequxy,axis=1)/n pij=np.dot(pi.reshape(k,1),pj.reshape(1,k)) A=(frequxy-npij)2/(npij) A[np.isnan(A)]=0 A[np.isinf(A)]=0 stat1=np.sum(A) res1.append(int(stat1>stats.chi2.ppf(0.95,(k-1)2))) a[p]=np.mean(res1) plt.plot(a)有哪些错误

right_inter_x = np.dot(np.ones((n, 1)), inter_x[1:(k + 1)].reshape(1, k)) left_inter_y = np.dot(np.ones((n, 1)), inter_y[0:k].reshape(1, k)) right_inter_y = np.dot(np.ones((n, 1)), inter_y[1:(k + 1...

def backward(self, X, y, learning_rate): error = self.y_hat - y delta2 = error delta1 = np.dot(delta2, self.weights2.T) * self.relu_derivative(self.a1) grad_weights2 = np.dot(self.a1.T, delta2) grad_bias2 = np.sum(delta2, axis=0, keepdims=True) grad_weights1 = np.dot(X.T, delta1) grad_bias1 = np.sum(delta1, axis=0) self.weights2 -= learning_rate * grad_weights2 self.bias2 -= learning_rate * grad_bias2 self.weights1 -= learning_rate * grad_weights1

接着，计算两层之间的权重和偏置值的导数（grad_weights2、grad_bias2、grad_weights1和grad_bias1），并更新它们的值（self.weights2、self.bias2和self.weights1）。最后，返回更新后的权重和偏置值，以供下一次...

基于springboot的酒店管理系统源码（java毕业设计完整源码+LW）.zip

项目均经过测试，可正常运行！环境说明：开发语言：java JDK版本：jdk1.8 框架：springboot 数据库：mysql 5.7/8 数据库工具：navicat 开发软件：eclipse/idea

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def _load_rml(self, npy_file): data = np.load(npy_file, allow_pickle=True) data = np.expand_dims(data, axis=0)/255.0解释代码

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