import numpy as np import cv2 def PSO_Gabor(func, x0, bounds, niters=100, nparticles=20, w=0.5, c1=1, c2=1): nparams = len(bounds) x = np.zeros((nparticles, nparams)) v = np.zeros_like(x) pbest = np.zeros_like(x) fitness = np.zeros(nparticles) gbest = np.zeros(nparams) gbest_fitness = np.inf for i in range(nparticles): x[i,:] = x0 + np.random.uniform(-1, 1, size=nparams) v[i,:] = np.random.uniform(-1, 1, size=nparams) pbest[i,:] = x[i,:] fitness[i] = func(x[i,:]) if fitness[i] < gbest_fitness: gbest_fitness = fitness[i] gbest = x[i,:] for _ in range(niters): for i in range(nparticles): v[i,:] = w*v[i,:] + c1*np.random.uniform(0,1,size=nparams)*(pbest[i,:] - x[i,:]) + c2*np.random.uniform(0,1,size=nparams)*(gbest - x[i,:]) x[i,:] = np.clip(x[i,:] + v[i,:], bounds[:,0], bounds[:,1]) fitness[i] = func(x[i,:]) if fitness[i] < pbest[i]: pbest[i,:] = x[i,:] if fitness[i] < gbest_fitness: gbest_fitness = fitness[i] gbest = x[i,:] return gbest def gabor_kernel(size, sigma, theta, lambd, gamma): """生成Gabor核""" kernel = cv2.getGaborKernel((size, size), sigma, theta, lambd, gamma, 0, ktype=cv2.CV_32F) return kernel def func(image, kernel): """使用Gabor核进行变换""" transformed = cv2.filter2D(image, cv2.CV_8UC3, kernel) return transformed image = cv2.imread('G:/python/python.wenjian/images/lw2.jpg', 0) best_params = PSO_Gabor(func, image, (image,2), niters=100, nparticles=20, w=0.5, c1=1, c2=1) print(gabor_kernel)这段代码哪里有问题

import numpy as np from scipy.optimize import linprog def integer_cutting_plane(c, A, b, bounds): relaxed_A = A relaxed_b = b while True: res = linprog(c=c, A_ub=relaxed_A, b_ub=relaxed_b, bounds=bounds) x = res.x if all(int(val) == val for val in x): return x.astype(int) new_constraint = (relaxed_A @ x <= relaxed_b) relaxed_A = np.vstack((relaxed_A, new_constraint)) def get_bounds(): return [(0, None), (0, None)] def get_c(): return np.array([40, 90]) def get_A(): return np.array([[-9, -7], [-7, -20]]) def get_b(): return np.array([-56, -70]) if name == 'main': bounds = get_bounds() integer_cutting_plane(get_c(), get_A(), get_b(), bounds)以上代码运行报错ValueError: Invalid input for linprog: b_ub must be a 1-D array; b_ub must not have more than one non-singleton dimension and the number of rows in A_ub must equal the number of values in b_ub 请解决

import numpy as np from scipy.optimize import linprog def integer_cutting_plane(c, A, b, bounds): relaxed_A = A relaxed_b = b while True: res = linprog(c=c, A_ub=relaxed_A, b_ub=relaxed_b....

import cv2 import numpy as np def build_filters(): filters = [] ksize = 9 for theta in np.arange(0, np.pi, np.pi / 4): for lamda in np.arange(np.pi / 4, np.pi, np.pi / 4): kern = cv2.getGaborKernel((ksize, ksize), 1.0, theta, lamda, 0.5, 0, ktype=cv2.CV_32F) kern /= 1.5 * kern.sum() filters.append(kern) return filters def process(img, filters): accum = np.zeros_like(img) for kern in filters: fimg = cv2.filter2D(img, cv2.CV_8UC3, kern) np.maximum(accum, fimg, accum) return accum if name == 'main': img = cv2.imread("4/6.jpg", cv2.IMREAD_GRAYSCALE) filters = build_filters() res = process(img, filters) cv2.imshow("Result", res) cv2.waitKey(0) cv2.destroyAllWindows()

这段代码使用了OpenCV库中的函数实现了一个Gabor滤波器，用于图像处理。具体实现包括了生成一系列Gabor核，以及将这些核逐一应用于图像并将结果累加得到最终的输出图像。你可以在代码中指定需要处理的图像，以及...

import os import cv2 import numpy as np def gabor_kernel(ksize, sigma, gamma, lamda, alpha, psi): """ reference https://en.wikipedia.org/wiki/Gabor_filter """ sigma_x = sigma sigma_y = sigma / gamma ymax = xmax = ksize // 2 # 9//2 xmin, ymin = -xmax, -ymax # print("xmin, ymin,xmin, ymin",xmin, ymin,ymax ,xmax) # X(第一个参数，横轴)的每一列一样， Y（第二个参数，纵轴）的每一行都一样 (y, x) = np.meshgrid(np.arange(ymin, ymax + 1), np.arange(xmin, xmax + 1)) # 生成网格点坐标矩阵 # print("y\n",y) # print("x\n",x) x_alpha = x * np.cos(alpha) + y * np.sin(alpha) y_alpha = -x * np.sin(alpha) + y * np.cos(alpha) print("x_alpha[0][0]", x_alpha[0][0], y_alpha[0][0]) exponent = np.exp(-.5 * (x_alpha 2 / sigma_x 2 + y_alpha 2 / sigma_y 2)) # print(exponent[0][0]) # print(x[0],y[0]) kernel = exponent * np.cos(2 * np.pi / lamda * x_alpha + psi) print(kernel) # print(kernel[0][0]) return kernel def gabor_filter(gray_img, ksize, sigma, gamma, lamda, psi): filters = [] for alpha in np.arange(0, np.pi, np.pi / 4): print("alpha", alpha) kern = gabor_kernel(ksize=ksize, sigma=sigma, gamma=gamma, lamda=lamda, alpha=alpha, psi=psi) filters.append(kern) gabor_img = np.zeros(gray_img.shape, dtype=np.uint8) i = 0 for kern in filters: fimg = cv2.filter2D(gray_img, ddepth=cv2.CV_8U, kernel=kern) gabor_img = cv2.max(gabor_img, fimg) i += 1 p = 1.25 gabor_img = (gabor_img - np.min(gabor_img, axis=None)) ** p _max = np.max(gabor_img, axis=None) gabor_img = gabor_img / _max print(gabor_img) gabor_img = gabor_img * 255 return gabor_img.astype(dtype=np.uint8) def main(): dir_path = '7/' files = os.listdir(dir_path) for i in files: print(i) img = cv2.imread(dir_path + "/" + i) img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) gabor_img = gabor_filter(img_gray, ksize=9, sigma=1, gamma=0.5, lamda=5, psi=-np.pi / 2) Img_Name = "5/gabor/" + str(i) cv2.imwrite(Img_Name, gabor_img) main()

其中，使用了Python中的三个模块，分别是os、cv2和numpy。函数的输入参数为ksize、sigma、gamma、lamda、alpha和psi，分别表示核的大小、标准差、长宽比、波长、方向以及相位偏移。函数的实现采用了Gabor滤波器的...

import numpy as np x0=1 theta=1 mu=1 sigma=0.5 t=10 I=10000 z=np.random.standard_normal(I) St=np.exp(-thetat) Xt=x0St+mu(1-St)+sigmanp.sqrt((1-St)/(2theta))z V = np.mean(Xt) print (V)

这段代码使用了numpy库模拟了一个股票价格的模型，其中包括初始价格x0，股票的波动性（sigma），跳跃的速率（theta），股票收益率的平均值（mu）等参数。其中，使用了随机数生成函数np.random.standard_normal(I)...

下面这段代码报错（import threading import pandas as pd import numpy as np def thread1_func():#####接受挠度数据 global a a=5 event.wait() # 等待线程1完成 def thread2_func():#####接受应变数据 global c c=5 event.wait() # 等待线程1完成 thread1 = threading.Thread(target=thread1_func) thread2 = threading.Thread(target=thread2_func) thread1.start() thread2.start() thread1.join() thread2.join() b=a+c）

import numpy as np event = threading.Event() def thread1_func(): global a a = 5 event.wait() # 等待线程1完成 def thread2_func(): global c c = 5 event.wait() # 等待线程1完成 thread1 = ...

import numpy as np import matplotlib.pyplot as plt def plot_trig_function(trig_func, start, end, step): x = np.arange(start, end, step) if trig_func == 'sin': y = np.sin(x) elif trig_func == 'cos': y = np.cos(x) elif trig_func == 'tan': y = np.tan(x) else: print('Invalid trig function') return plt.plot(x, y) plt.xlabel('x') plt.ylabel(trig_func + '(x)') plt.title(trig_func + ' function') plt.show()

import numpy as np import matplotlib.pyplot as plt def plot_trig_function(trig_func, start, end, step): x = np.arange(start, end, step) if trig_func == 'sin': y = np.sin(x) elif trig_func == 'cos...

import argparse import logging import re from multiprocessing import Process, Queue from pathlib import Path import numpy as np from skimage import exposure, filters from modules.config import logger from modules.volume import volume_loading_func, volume_saving_func def normalize_intensity( np_volume: np.ndarray, relative_path: Path, logger: logging.Logger ): logger.info(f"[processing start] {relative_path}") nstack = len(np_volume) stack: np.ndarray = np_volume[nstack // 2 - 16 : nstack // 2 + 16] hist_y, hist_x = exposure.histogram(stack[stack > 0]) thr = filters.threshold_otsu(stack[stack > 0]) peak_air = np.argmax(hist_y[hist_x < thr]) + hist_x[0] peak_soil = np.argmax(hist_y[hist_x > thr]) + (thr - hist_x[0]) + hist_x[0] np_volume = np_volume.astype(np.int64) for i in range(len(np_volume)): np_volume[i] = ( (np_volume[i] - peak_air).clip(0) / (peak_soil - peak_air) * 256 / 2 ) logger.info(f"[processing end] {relative_path}") return exposure.rescale_intensity( np_volume, in_range=(0, 255), out_range=(0, 255) ).astype(np.uint8) 请详细解释每一行的代码意思

这段代码是一个函数normalize_intensity，用于对一个numpy数组进行强度的归一化处理，可以接受三个参数: np_volume表示输入的numpy数组，relative_path表示处理的数据路径，logger表示日志输出的logger对象。...

解释一下这段代码：import random import numpy as np from PIL import Image import imgaug.augmenters as iaa class AugCompose(object): ''' object类当被调用时，它不接受任何参数，并返回一个新的无功能实例，该实例没有实例属性，也不能被赋予任何属性。 ''' def init(self): self.gamma = random.uniform(0.8, 1.2) self.bright = random.uniform(0.5, 2.0) def call(self, pilimage: list): imgs = [] gamma_tr = iaa.GammaContrast(gamma=self.gamma) bright_tr = iaa.Multiply(mul=self.bright) for img in pilimage: assert isinstance(img, Image.Image) np_img = np.array(img, dtype=np.uint8) np_img = gamma_tr.augment_image(np_img) np_img = bright_tr.augment_image(np_img) img = Image.fromarray(np_img) imgs.append(img) return imgs

然后，将 pilimage 中的每个图像对象转换为 numpy 数组，并利用 gamma_tr 和 bright_tr 对图像进行增强。最后，将增强后的 numpy 数组转换为 PIL 图像对象，存入 imgs 列表中，并将 imgs 列表作为输出返回...

帮我在下面的代码中添加高斯优化，原代码如下：import numpy as np from sklearn.svm import OneClassSVM from scipy.optimize import minimize def fitness_function(x): """ 定义适应度函数，即使用当前参数下的模型进行计算得到的损失值 """ gamma, nu = x clf = OneClassSVM(kernel='rbf', gamma=gamma, nu=nu) clf.fit(train_data) y_pred = clf.predict(test_data) # 计算错误的预测数量 error_count = len([i for i in y_pred if i != 1]) # 将错误数量作为损失值进行优化 return error_count def genetic_algorithm(x0, bounds): """ 定义遗传算法优化函数 """ population_size = 20 # 种群大小 mutation_rate = 0.1 # 变异率 num_generations = 50 # 迭代次数 num_parents = 2 # 选择的父代数量 num_elites = 1 # 精英数量 num_genes = x0.shape[0] # 参数数量 # 随机初始化种群 population = np.random.uniform(bounds[:, 0], bounds[:, 1], size=(population_size, num_genes)) for gen in range(num_generations): # 选择父代 fitness = np.array([fitness_function(x) for x in population]) parents_idx = np.argsort(fitness)[:num_parents] parents = population[parents_idx] # 交叉 children = np.zeros_like(parents) for i in range(num_parents): j = (i + 1) % num_parents mask = np.random.uniform(size=num_genes) < 0.5 children[i, mask] = parents[i, mask] children[i, ~mask] = parents[j, ~mask] # 变异 mask = np.random.uniform(size=children.shape) < mutation_rate children[mask] = np.random.uniform(bounds[:, 0], bounds[:, 1], size=np.sum(mask)) # 合并种群 population = np.vstack([parents, children]) # 选择新种群 fitness = np.array([fitness_function(x) for x in population]) elites_idx = np.argsort(fitness)[:num_elites] elites = population[elites_idx] # 输出结果 best_fitness = fitness[elites_idx[0]] print(f"Gen {gen+1}, best fitness: {best_fitness}") return elites[0] # 初始化参数 gamma0, nu0 = 0.1, 0.5 x0 = np.array([gamma0, nu0]) bounds = np.array([[0.01, 1], [0.01, 1]]) # 调用遗传算法优化 best_param = genetic_algorithm(x0, bounds) # 在最佳参数下训练模型，并在测试集上进行测试 clf = OneClassSVM(kernel='rbf', gamma=best_param[0], nu=best_param[1]) clf.fit(train_data) y_pred = clf.predict(test_data) # 计算错误的预测数量 error_count = len([i for i in y_pred if i != 1]) print(f"Best fitness: {error_count}, best parameters: gamma={best_param[0]}, nu={best_param[1]}")

import numpy as np from sklearn.svm import OneClassSVM from scipy.optimize import minimize def fitness_function(x): """ 定义适应度函数，即使用当前参数下的模型进行计算得到的损失值 """ gamma...

import numpy as np import pandas as pd from sklearn.preprocessing import MinMaxScaler from sklearn.neural_network import MLPRegressor from pyswarm import pso file = "zhong.xlsx" data = pd.read_excel(file) #reading file # 数据预处理 scaler = MinMaxScaler(feature_range=(0, 1)) data_scaled = scaler.fit_transform(data) X = data_scaled[:, :-1] y = data_scaled[:, -1] # 定义BP神经网络模型 def neural_network(w): clf = MLPRegressor(hidden_layer_sizes=(8, 4), activation='relu', solver='lbfgs') clf.fit(X, y) return clf.predict(X) # 定义粒子群算法目标函数 def objective_function(w): return ((neural_network(w) - y) ** 2).mean() # 使用粒子群算法优化BP神经网络模型 lb = np.zeros(8) ub = np.ones(8) xopt, fopt = pso(objective_function, lb, ub, maxiter=100) # 输出预测结果 predicted = neural_network(xopt) predicted = scaler.inverse_transform(np.concatenate((X, predicted.reshape(-1, 1)), axis=1))[:, -1] print(predicted)

这段代码是一个简单的使用粒子群算法（PSO）优化BP神经网络模型预测的例子。首先，读取名为"zhong.xlsx"的Excel文件，并对数据进行归一化处理。然后，定义了一个包含两个隐藏层的BP神经网络模型，其中第一个隐藏层有...

import cv2 import numpy as np import matplotlib.pyplot as plt def build_filters(): filters = [] ksize = 9 for theta in np.arange(0, np.pi, np.pi / 8): for sigma in range(1, 6): for frequency in (0.1, 0.2): kernel = cv2.getGaborKernel((ksize, ksize), sigma, theta, frequency, 0.5, 0, ktype=cv2.CV_32F) kernel /= 1.5 * kernel.sum() filters.append(kernel) return filters def process(img, filters): features = np.zeros((img.shape[0], img.shape[1], len(filters)), dtype=np.float32) for i, kernel in enumerate(filters): filtered = cv2.filter2D(img, cv2.CV_8UC3, kernel) features[:, :, i] = filtered return features # 读取图像并转为灰度图 img = cv2.imread('lena.jpg') gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) # 构建gabor滤波器组 filters = build_filters() # 对图像进行gabor特征提取 features = process(gray, filters) # 显示gabor滤波后的特征图像 fig, axes = plt.subplots(nrows=5, ncols=8, figsize=(16, 10)) for i, ax in enumerate(axes.flat): ax.imshow(features[:, :, i], cmap='gray') ax.set_xticks([]) ax.set_yticks([]) plt.show()用矩阵将这段代码中特征提取后的图像表示出来

在这段代码中，使用了OpenCV库和NumPy库构建了Gabor滤波器组，然后对图像进行Gabor特征提取，并使用Matplotlib库将每个滤波器返回的特征图像显示出来。features是一个三维数组，其中第一维和第二维表示图像的高度和...

请修改以下代码使之输出正确的波函数随x的变化曲线图像import numpy as np import matplotlib.pyplot as plt def square_poten_well(x, N): L = 2 V0 = -1 mat_V = np.zeros((N, N)) for i, xx in enumerate(x): if abs(xx) <= L/2: mat_V[i, i] = V0 return mat_V def phi(k, x, N): return [np.exp(1.0jkx[i]) for i in range(N)] def Green_func(k, x, xp, N): G = np.ones((N, N), dtype=complex) for i in range(N): G[i, :] = [-1.0j / k * np.exp(1.0jknp.abs(x[i]-xp[j])) for j in range(N)] return G def change_of_var(node, weight, a, b, N): nop = [(b-a) * node[i] / 2.0 + (a+b) / 2.0 for i in range(N)] wp = [(b-a) / 2.0 * weight[i] for i in range(N)] return nop, wp # 计算波函数 def calc_wave_func(k, x, N): mat_V = square_poten_well(x, N) G = Green_func(k, x, x, N) G_inv = np.linalg.inv(G - mat_V) phi_k = phi(k, x, N) return np.dot(G_inv, phi_k) N = 298 a = -1.5 b = 1.5 k_vec = np.arange(0.5, 6.0) x, w = np.polynomial.legendre.leggauss(N) x = (b-a)/2.0x + (b+a)/2.0 w = (b-a)/2.0w # 绘制波函数变化图像 fig, axes = plt.subplots(nrows=2, ncols=3, figsize=(12, 8)) for i, k in enumerate(k_vec): wave_func = np.abs(np.array(calc_wave_func(k, x, N))) ax = axes[i//3, i%3] ax.plot(x, wave_func) ax.set_title(f'Wave function for k={k:.1f}') ax.set_xlabel('x') ax.set_ylabel('|psi(x)|') plt.tight_layout() plt.show():

import numpy as np import matplotlib.pyplot as plt def square_poten_well(x, N): L = 2 V0 = -1 mat_V = np.zeros((N, N)) for i, xx in enumerate(x): if abs(xx) <= L/2: mat_V[i, i] = V0 return mat...

以下代码总是提示错误ZeroDivisionError: float division by zero，怎么解决import numpy as np from scipy.optimize import minimize_scalar # 定义似然函数 def likelihood(r): return -np.log(2 * np.pi) - 0.5 * np.log(1 - r**2) - 0.5 * (1**2 - 2 * r * 1 * 2 + 22)/ (1 - r2) bounds = (0.5, 0.7) # 最大似然估计 result = minimize_scalar(lambda r: -likelihood(r),method='brent',bounds=bounds) print(result)这段代码总是提示错误

return -np.log(2 * np.pi) - 0.5 * np.log(1 - r**2 + 1e-10) - 0.5 * (1**2 - 2 * r * 1 * 2 + 2**2)/ (1 - r**2 + 1e-10) bounds = (0.5, 0.7) # 最大似然估计 result = minimize_scalar(lambda r: -...

import open3d as o3d import numpy as np import torch import torch.nn.functional as F import matplotlib.pyplot as plt # 读取点云文件 pcd = o3d.io.read_point_cloud(r"E:\BISHE\pcd\neuvsnap_0418_154523.pcd") def gaussian_filter(input, kernel_size=3, sigma=0.5): # Create a 1D Gaussian kernel kernel = np.exp(-np.square(np.arange(-kernel_size // 2 + 1, kernel_size // 2 + 1)) / (2 * np.square(sigma))) kernel = torch.FloatTensor(kernel).unsqueeze(0).unsqueeze(0) # Normalize the kernel kernel = kernel / kernel.sum() # Apply the filter using conv2d padding = kernel_size // 2 filtered = F.conv2d(input.unsqueeze(0), kernel, padding=padding, groups=input.size(1)) return filtered.squeeze(0) # 将点云转换为 PyTorch 张量 points = np.asarray(pcd.points) points = torch.from_numpy(points).float() # 使用简单的高斯滤波器进行去噪 points = gaussian_filter(points, kernel_size=3, sigma=0.5) # 将点云转换回 numpy 数组并可视化 points_np = points.numpy() pcd_processed = o3d.geometry.PointCloud() pcd_processed.points = o3d.utility.Vector3dVector(points_np) o3d.visualization.draw_geometries([pcd_processed]) # 计算点云体积并打印结果 volume = 0 for i in range(points_np.shape[0]): volume += points_np[i, 0] * points_np[i, 1] * points_np[i, 2] print("Volume:", volume) # 将点云和体积测量结果导出 o3d.io.write_point_cloud("example_processed.pcd", pcd_processed) with open("volume.txt", "w") as f: f.write(str(volume))运行后报错Traceback (most recent call last): File "E:/BISHE/Pointnet2/main.py", line 30, in <module> points = gaussian_filter(points, kernel_size=3, sigma=0.5) File "E:/BISHE/Pointnet2/main.py", line 21, in gaussian_filter filtered = F.conv2d(input.unsqueeze(0), kernel, padding=padding, groups=input.size(1)) RuntimeError: expected stride to be a single integer value or a list of 1 values to match the convolution dimensions, but got stride=[1, 1]

这个错误是因为在使用 F.conv2d() 函数时，输入张量的维度不符合要求。在函数中，参数 stride 需要输入一个整数或者长度为 1 的列表，但是你的输入中 stride=[1, 1]，这就导致了错误。你可以将 F.conv2d()...

【java毕业设计】应急救援物资管理系统源码（springboot+vue+mysql+说明文档）.zip

项目经过测试均可完美运行！环境说明：开发语言：java jdk：jdk1.8 数据库：mysql 5.7+ 数据库工具：Navicat11+ 管理工具：maven 开发工具：idea/eclipse

import numpy as np import imageio def preprocess_input(x, v2=True): x = x.astype('float32') x = x / 255.0 if v2: x = x - 0.5 x = x * 2.0 return x

相关推荐

import numpy as np import imageio def preprocess_input(x, v2=True): x = x.astype('float32') x = x / 255.0 if v2: x = x - 0.5 x = x * 2.0 return x

相关推荐

python 3.74 运行import numpy as np 报错lib\site-packages\numpy\__init__.py

import numpy as np import matplotlib.pyplot as plt import math

python数据分析与可视化 import pandas as pd import numpy as np import m

import numpy as np x0=1 theta=1 mu=1 sigma=0.5 t=10 I=10000 z=np.random.standard_normal(I) St=np.exp(-theta*t) Xt=x0*St+mu*(1-St)+sigma*np.sqrt((1-St)/(2*theta))*z V = np.mean(Xt) print (V)

【java毕业设计】应急救援物资管理系统源码（springboot+vue+mysql+说明文档）.zip

最新推荐

【java毕业设计】应急救援物资管理系统源码（springboot+vue+mysql+说明文档）.zip

基于java的音乐网站答辩PPT.pptx

Android圆角进度条控件的设计与应用

管理建模和仿真的文件

【R语言lattice包实战】：从案例到技巧，图形制作不再难

输入正整数n.打出长度为n的菱形

mui框架实现带侧边栏的响应式布局

"互动学习：行动中的多样性与论文攻读经历"

【交互式图形】：Shiny应用中lattice包的巧妙应用指南

安装包部署到docker中

python 3.74 运行import numpy as np 报错lib\site-packages\numpy\init.py

import numpy as np x0=1 theta=1 mu=1 sigma=0.5 t=10 I=10000 z=np.random.standard_normal(I) St=np.exp(-thetat) Xt=x0St+mu(1-St)+sigmanp.sqrt((1-St)/(2theta))z V = np.mean(Xt) print (V)