How to implement a neural network

神经网络的实践笔记 link: http://peterroelants.github.io/posts/neural_network_implementation_part01/ 1. 生成训练数据 import numpy as np import matplotlib.pyplot as plt # 神经网络中有关# 矩阵的运算我们采用NumPy来构建,# 画图使用Matplotlib来构建. # Part 1, create training data # Define the vect…

从0开始用python实现神经网络 IMPLEMENTING A NEURAL NETWORK FROM SCRATCH IN PYTHON – AN INTRODUCTION

code地址:https://github.com/dennybritz/nn-from-scratch 文章地址:http://www.wildml.com/2015/09/implementing-a-neural-network-from-scratch/ Get the code: To follow along, all the code is also available as an iPython notebook on Github. In this post we will i…

Tensorflow - Implement for a Convolutional Neural Network on MNIST.

Coding according to TensorFlow 官方文档中文版中文注释源于:tf.truncated_normal与tf.random_normal TF-卷积函数 tf.nn.conv2d 介绍 TensorFlow - tf.nn.conv2d tf.nn.max_pool参数含义和用法 import tensorflow as tf from tensorflow.examples.tutorials.mnist import input_data mnist = inpu…

A Neural Network in 11 lines of Python

A Neural Network in 11 lines of Python A bare bones neural network implementation to describe the inner workings of backpropagation. Posted by iamtrask on July 12, 2015 Summary: I learn best with toy code that I can play with. This tutorial teaches b…

machine learning 之 Neural Network 3

整理自Andrew Ng的machine learning课程week6. 目录: Advice for applying machine learning (Decide what to do next) Debugging a learning algorithm machine learning diagnostic Evaluating a hypothesis Model selection and Train / validation / test set Bias and Vari…

计算机视觉学习记录 - Implementing a Neural Network from Scratch - An Introduction

0 - 学习目标我们将实现一个简单的3层神经网络,我们不会仔细推到所需要的数学公式,但我们会给出我们这样做的直观解释.注意,此次代码并不能达到非常好的效果,可以自己进一步调整或者完成课后练习来进行改进. 1 - 实验步骤 1.1 - Import Packages # Package imports import matplotlib.pyplot as plt import numpy as np import sklearn import sklearn.datasets import s…

课程五(Sequence Models)，第一周（Recurrent Neural Networks） —— 1.Programming assignments：Building a recurrent neural network - step by step

Building your Recurrent Neural Network - Step by Step Welcome to Course 5's first assignment! In this assignment, you will implement your first Recurrent Neural Network in numpy. Recurrent Neural Networks (RNN) are very effective for Natural Language…

Neural Networks and Deep Learning（week4）Deep Neural Network - Application（图像分类）

Deep Neural Network for Image Classification: Application 预先实现的代码,保存在本地 dnn_app_utils_v3.py import numpy as np import matplotlib.pyplot as plt import h5py def sigmoid(Z): """ Implements the sigmoid activation in numpy Arguments: Z -- numpy…

Neural Networks and Deep Learning（week4）Building your Deep Neural Network: Step by Step

Building your Deep Neural Network: Step by Step 你将使用下面函数来构建一个深层神经网络来实现图像分类. 使用像relu这的非线性单元来改进你的模型构建一个多隐藏层的神经网络(有超过一个隐藏层) 符号说明: 1 - Packages(导入的包) numpy:进行科学计算的包 matplotlib :绘图包 dnn_utils:提供一些必要功能 testCases 提供一些测试用例来评估函数的正确性 np.random.seed(1) 设置随机数种子…

Neural Networks and Deep Learning（week2）Logistic Regression with a Neural Network mindset（实现一个图像识别算法）

Logistic Regression with a Neural Network mindset You will learn to: Build the general architecture of a learning algorithm, including: Initializing parameters(初始化参数) Calculating the cost function and its gradient(计算代价函数,和他的梯度) Using an optimization…

课程一(Neural Networks and Deep Learning)，第四周（Deep Neural Networks） —— 3.Programming Assignments: Deep Neural Network - Application

Deep Neural Network - Application Congratulations! Welcome to the fourth programming exercise of the deep learning specialization. You will now use everything you have learned to build a deep neural network that classifies cat vs. non-cat images. In…

课程一(Neural Networks and Deep Learning)，第四周（Deep Neural Networks）——2.Programming Assignments: Building your Deep Neural Network: Step by Step

Building your Deep Neural Network: Step by Step Welcome to your third programming exercise of the deep learning specialization. You will implement all the building blocks of a neural network and use these building blocks in the next assignment to bui…

课程一(Neural Networks and Deep Learning)，第二周（Basics of Neural Network programming）—— 4、Logistic Regression with a Neural Network mindset

Logistic Regression with a Neural Network mindset Welcome to the first (required) programming exercise of the deep learning specialization. In this notebook you will build your first image recognition algorithm. You will build a cat classifier that r…

课程一(Neural Networks and Deep Learning)，第二周（Basics of Neural Network programming）—— 0、学习目标

1. Build a logistic regression model, structured as a shallow neural network2. Implement the main steps of an ML algorithm, including making predictions, derivative computation, and gradient descent.3. Implement computationally efficient, highly vect…

CheeseZH: Stanford University: Machine Learning Ex4:Training Neural Network(Backpropagation Algorithm)

1. Feedforward and cost function; 2.Regularized cost function: 3.Sigmoid gradient The gradient for the sigmoid function can be computed as: where: 4.Random initialization randInitializeWeights.m function W = randInitializeWeights(L_in, L_out) %RANDIN…

Deeplearning - Overview of Convolution Neural Network

Finally pass all the Deeplearning.ai courses in March! I highly recommend it! If you already know the basic then you may be interested in course 4 & 5, which shows many interesting cases in CNN and RNN. Although I do think that 1 & 2 is better str…

[C4] 前馈神经网络(Feedforward Neural Network)

前馈神经网络(Feedforward Neural Network - BP) 常见的前馈神经网络感知器网络感知器(又叫感知机)是最简单的前馈网络,它主要用于模式分类,也可用在基于模式分类的学习控制和多模态控制中.感知器网络可分为单层感知器网络和多层感知器网络. BP网络 BP网络是指连接权调整采用了反向传播(Back Propagation)学习算法的前馈网络.与感知器不同之处在于,BP网络的神经元变换函数采用了S形函数(Sigmoid函数),因此输出量是0~1之间的连续量,可实现从输入到…

[Scikit-learn] 1.1 Generalized Linear Models - Neural network models

本章涉及到的若干知识点(红字):本章节是作为通往Tensorflow的前奏! 链接:https://www.zhihu.com/question/27823925/answer/38460833 首先,神经网络的最后一层,也就是输出层,是一个 Logistic Regression (或者 Softmax Regression ),也就是一个线性分类器. 那么,输入层和中间那些隐层又在干吗呢?你可以把它们看成一种特征提取的过程,就是把 Logistic Regression 的输出当作特征,然后…

Sequence Models Week 1 Building a recurrent neural network - step by step

Recurrent Neural Network系列1--RNN（循环神经网络）概述

作者:zhbzz2007 出处:http://www.cnblogs.com/zhbzz2007 欢迎转载,也请保留这段声明.谢谢! 本文翻译自 RECURRENT NEURAL NETWORKS TUTORIAL, PART 1 – INTRODUCTION TO RNNS . Recurrent Neural Networks(RNNS) ,循环神经网络,是一个流行的模型,已经在许多NLP任务上显示出巨大的潜力.尽管它最近很流行,但是我发现能够解释RNN如何工作,以及如何实现RNN的资料很少…

Neural Network Toolbox使用笔记1：数据拟合

http://blog.csdn.net/ljp1919/article/details/42556261 Neural Network Toolbox为各种复杂的非线性系统的建模提供多种函数和应用程序.该工具箱提供各种监督学习模型:前向反馈,径向基核函数和动态网络等模型.同时也提供自组织图和竞争层结构(competitive layers)的非监督学习模型.该工具箱具有设计.训练.可视化与仿真神经网络的功能.基于该工具箱可以进行数据拟合.模式识别.分类和时间序列预测及其动态系统的建模和控制.…

《Neural Network and Deep Learning》_chapter4

<Neural Network and Deep Learning>_chapter4: A visual proof that neural nets can compute any function文章总结(前三章翻译在百度云里) 链接:http://neuralnetworksanddeeplearning.com/chap4.html: Michael Nielsen的<Neural Network and Deep Learning>教程中的第四章主要是证明神经网络可以用…

CS224d assignment 1【Neural Network Basics】

refer to: 机器学习公开课笔记(5):神经网络(Neural Network) CS224d笔记3--神经网络深度学习与自然语言处理(4)_斯坦福cs224d 大作业测验1与解答 CS224d Problem set 1作业 softmax: def softmax(x): assert len(x.shape) > 1 x -= np.max(x, axis=1, keepdims=True) x = np.exp(x) / np.sum(np.exp(x), axis=1, kee…

XiangBai——【AAAI2017】TextBoxes_A Fast Text Detector with a Single Deep Neural Network

XiangBai--[AAAI2017]TextBoxes:A Fast Text Detector with a Single Deep Neural Network 目录作者和相关链接方法概括创新点和贡献方法细节实验结果总结与收获点作者和相关链接作者论文下载廖明辉,石葆光, 白翔, 王兴刚 ,刘文予代码下载方法概括文章核心: 改进版的SSD用来解决文字检测问题端到端识别的pipeline: Step 1: 图像输入到修改版SSD网络中 + 非极大值抑制(NMS)→…

论文阅读（Weilin Huang——【TIP2016】Text-Attentional Convolutional Neural Network for Scene Text Detection）

Weilin Huang--[TIP2015]Text-Attentional Convolutional Neural Network for Scene Text Detection) 目录作者和相关链接方法概括创新点和贡献方法细节实验结果问题讨论总结与收获点作者补充信息参考文献作者和相关链接论文下载作者: tong he, 黄伟林,乔宇,姚剑方法概括使用改进版的MSER(CE-MSERs,contrast-enhancement)提取候选字符区域: 使用新的CN…

论文阅读（Xiang Bai——【PAMI2017】An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition）

白翔的CRNN论文阅读 1. 论文题目 Xiang Bai--[PAMI2017]An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition 2. 论文思路和方法 1) 问题范围: 单词识别 2) CNN层:使用标准CNN提取图像特征,利用Map-to-Sequence表示成特征向量: 3) RNN层:使…