机器学习
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令狐傻笑
图像算法工程师，主要研究方向为图像分类，目标检测
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基于python构建数据集5折交叉验证划分的方法
基于的python库为scikit-learn，通过pip install scikit-learn安装相关代码如下：from sklearn.model_selection import KFoldfolds = KFold(n_splits=5, shuffle=True, random_state=seed)for fold_i, (train_index, val_index) in enumerate(folds.split(self.image_path_list)): t.原创 2021-09-19 09:34:38 · 3920 阅读 · 0 评论 -
吴恩达机器学习——Andrew Ng machine-learning-ex1 python实现
目录Exercise 1: Linear Regression1. warmUpExercise2. Plotting the Data3. Gradient Descent3.1 Computing the cost3.2 Gradient descent4. Visualizing JExercise 1: Linear Regression...原创 2019-03-15 20:29:35 · 525 阅读 · 0 评论 -
吴恩达机器学习——Andrew Ng machine-learning-ex2 python实现
目录Exercise 2: Logistic Regression1. Logistic Regression1.1 Plotting1.2 sigmoid function1.3 Cost function and gradient1.4 Optimize1.5 Predict2. Regularized logistic regression2.1 Pl...原创 2019-04-30 16:51:38 · 351 阅读 · 0 评论 -
PyTorch学习——Andrew Ng machine-learning-ex2 Logistic Regression实现
目录Exercise 2: Logistic Regression1. Logistic 模型2. 读取数据3.Logistic 回归4.正则化Logistic 回归Exercise 2: Logistic Regression需要用到的库import pandas as pdimport numpy as npimport matplotlib.pyplot...原创 2019-05-02 12:31:37 · 252 阅读 · 0 评论 -
吴恩达机器学习——Andrew Ng machine-learning-ex3 python实现
目录Exercise 3: Multi-class Classification and Neural Networks1. Multi-class Classification1.1 Loading and Visualizing Data1.2 Vectorize Logistic Regression1.3 One-vs-All Training1.4 Predict f...原创 2019-05-03 12:35:01 · 546 阅读 · 0 评论 -
PyTorch学习——Andrew Ng machine-learning-ex3 Multi-class Classification实现
目录Exercise 3: Multi-class Classification1. Logistic 模型2. 读取数据3.Logistic 回归4.其他尝试4.1修改Linear层的初始化权重4.2修改weight_decay值Exercise 3: Multi-class Classification基于pytorch，只实现作业中多类别分类问题。需要...原创 2019-05-03 14:40:30 · 319 阅读 · 0 评论 -
PyTorch学习——Andrew Ng machine-learning-ex4 Neural Networks Learning
目录Exercise 4: Neural Networks Learning1. Neural Networks模型2. 加载数据3. 网络训练4.结果比较4.1 激活函数比较4.2 隐藏层个数比较Exercise 4: Neural Networks Learning需要用到的库import numpy as npimport scipy.ioi...原创 2019-05-03 23:14:20 · 513 阅读 · 0 评论 -
PyTorch学习——Andrew Ng machine-learning-ex1 Linear Regression实现
目录Exercise 1: Linear Regression1. Linear模型2. 读取数据3.线性回归4.数据测试Exercise 1: Linear RegressionNg老师的作业使用python即可实现，使用pytorch实现是为了加深对机器学习算法和pytorch使用的理解。需要用到的库import pandas as pdimport n...原创 2019-04-30 15:50:23 · 306 阅读 · 0 评论