liuyf5231的博客_随笔,自动驾驶,c++

win10和ubuntu双系统下如何删除ubuntu

前面有一篇文章描述了如何安装win10和ubuntu双系统，但是有时候在安装完双系统后，又想把ubuntu删除，或者是重新安装ubuntu，那么应该怎么做？1. 下载MBRFix工具，可以百度搜索，放在c盘，命令行要以管理员身份运行，执行下面命令， cd c:\mbrfix MBRFix /drive 0 fixmbr /yes 2. 重启电脑，这时候发现直接进入了win10，而不是

Ubuntu

双系统

置顶原创 2021-05-20 14:30:14 859 阅读

函数矩阵对矩阵求导

dFdX=[∂F∂ξ11∂F∂ξ12…∂F∂ξ1n⋮⋮⋮∂F∂ξn1∂F∂ξn2…∂F∂ξnn]\dfrac {d\mathbf{F}}{d\mathbf{X}}=\begin{bmatrix}\dfrac {\partial F}{\partial \xi_{11}} &amp;amp;amp; \dfrac {\partial F}{\partial \xi_{12}} &amp;amp;amp; \ld...

数据结构

置顶原创 2021-05-20 23:00:20 1221 阅读

PCA原理补充

PCA（Principal Component Analysis）是一种常用的数据分析方法。前面转了一篇关于PCA原理的文章，其中有些部分写的不是很清晰，因此做一个补充。方差和协方差下图是一个正态分布，均值和方差提供了对数据在特征空间的分布进行衡量的手段。如图所示，大部分的数据都分布在μ±3σ\mu\pm3\sigmaμ±3σ区间中。而方差的计算公式如下，σ(x,x)=E[(x−E(x)...

数据结构

置顶原创 2021-05-20 23:00:16 766 阅读 1评论

什么是Privileged app

Android Privileged app和 System app问题So in 4.3 there was a concept of System applications. Apks that were placed in System/app were given system privellages. As of 4.4, there is a new concept of Privell

linux

置顶原创 2021-05-20 22:59:48 971 阅读

kernel module signing

============================== KERNEL MODULE SIGNING FACILITY ==============================CONTENTSOverview.Configuring module signing.Generating signing keys.Public keys in the k

linux

置顶原创 2021-05-20 22:59:47 980 阅读

error: only position independent executables (PIE) are supported

PIE, position independent executables.android 4.1上开始支持PIE，所以4.1之前的版本不能使用PIE的executable，而之前开发的app一般都是非PIE的。Android 4.1 PIE (Position Independent Executable) support Read-only relocations

linux

置顶原创 2021-05-20 22:59:46 1550 阅读

Keeping Your App Responsive(ANR)

It’s possible to write code that wins every performance test in the world, but still feels sluggish, hang or freeze for significant periods, or take too long to process input. The worst thing that can

linux

置顶原创 2021-05-20 22:59:45 283 阅读

App权限—normal and dangerous permissions

Determine What Permissions Your App Needs Normal Permissions Every Android app runs in a limited-access sandbox. If an app needs to use resources or information outside of its own sandbox, the app ha

linux

置顶原创 2021-05-20 22:59:44 365 阅读

HandlerThread的使用

为了方便在一个新线程中处理消息，android提供了HandlerThread，Handy class for starting a new thread that has a looper. The looper can then be used to create handler classes. Note that start() must still be called.其使用步骤如下，假设

linux

置顶原创 2021-05-20 22:59:43 716 阅读

What are root name servers?

The root zone Who operates them Where they are Who is responsible for them Where does the root zone come from How do resolvers find root servers Fault tolerance 关于DNS中的root name servers，转自

linux

置顶原创 2021-05-20 22:59:42 1311 阅读

authoritative name server vs recursive name server

An authoritative name server provides actual answer to your DNS queries such as – mail server IP address or web site IP address (A resource record). It provides original and definitive answers to DNS q

linux

置顶原创 2021-05-20 22:59:41 836 阅读

DNS解析过程简述

以example.com为例，top-level domain为.com，然后是second-level domain，example.com.如图所示，对于example.com的解析可以分为下面几步：client向本地dns server请求解析example.com的ip地址（client请求是recursive的）；本地dns server去root server(TLD，top-lev

linux

置顶原创 2021-05-20 22:59:40 1223 阅读

如何提高大型工程的编译速度？

这里的大型工程是指源代码个数超过1万以上的c/c++或者java的混合工程，而android AOSP就是这样一个很贴切的例子。android整个系统的编译非常耗时，动辄一个小时以上，搜索了一下关于提高编译速度的相关资料，可以从以下几方面入手。提高编译系统的硬件能力首先能够想到的肯定是提高编译机的硬件能力，例如cpu、内存、硬盘等。使用ccache ccache is a compiler

linux

置顶原创 2021-05-20 22:59:39 2292 阅读

how to use TensorFlow?

what is TensorFlowTensors, in general, are simply arrays of numbers, or functions, that transform according to certain rules under a change of coordinates. TensorFlow is an open source software libr

linux

置顶原创 2021-05-20 22:59:38 364 阅读

machine-learning articles

持续……. 入门《让我们从机器学习谈起》本文首先介绍了互联网界与机器学习大牛结合的趋势，以及使用机器学习的相关应用，接着以一个“等人故事”展开对机器学习的介绍。介绍中首先是机器学习的概念与定义，然后是机器学习的相关学科，机器学习中包含的各类学习算法，接着介绍机器学习与大数据的关系，机器学习的新子类深度学习，最后探讨了一下机器学习与人工智能发展的联系以及机器学习与潜意识的关联。经过本文的介绍，

linux

置顶原创 2021-05-20 22:59:37 323 阅读

After Go victory, challenges given to 'AlphaMahjong'

AlphaGo后，是否接下来会有Alpha麻将？比较有意思。The world’s top Go player Lee Sedol reviews the match after the fourth match of the Google DeepMind Challenge Match against Google’s artificial intelligence program AlphaG

linux

置顶原创 2021-05-20 22:59:36 283 阅读

Unicode and UTF-8

UTF-8 is a character encoding capable of encoding all possible Unicode code points. The encoding is defined by the Unicode standard. wiki上介绍UTF-8是字符的编码方式，可以将Unicode的所有code points都进行编码。UTF-8 is an enco

linux

置顶原创 2021-05-20 22:59:12 592 阅读

calibrate sensors

Why do we need to calibrate sensors?There are a lot of good sensors these days and many are ‘good enough’ out of the box for many non-critical applications. But in order to achieve the best possible a

linux

置顶原创 2021-05-20 22:59:11 518 阅读

An Introduction to the CAN Bus: How to Programmatically Control a Car

转自 https://news.voyage.auto/an-introduction-to-the-can-bus-how-to-programmatically-control-a-car-f1b18be4f377I recently collaborated with my friends at Voyage to enable programmatic control of the...

linux

置顶原创 2021-05-20 22:59:10 549 阅读

cuda The driver installation is unable to locate the kernel source

在Ubuntu16.04上安装cuda时，报如下错误; Installing the NVIDIA display driver… The driver installation is unable to locate the kernel source. Please make sure that the kernel source packages are installed a...

linux

置顶原创 2021-05-20 22:59:09 983 阅读

A Simple Makefile Tutorial

Makefiles are a simple way to organize code compilation. This tutorial does not even scratch the surface of what is possible using make, but is intended as a starters guide so that you can quickly and...

linux

置顶原创 2021-05-20 22:59:09 298 阅读

深入理解CPU和异构计算芯片GPU/FPGA/ASIC

转自，http://www.cnblogs.com/qcloud1001/p/6617764.html随着互联网用户的快速增长，数据体量的急剧膨胀，数据中心对计算的需求也在迅猛上涨。诸如深度学习在线预测、直播中的视频转码、图片压缩解压缩以及HTTPS加密等各类应用对计算的需求已远远超出了传统CPU处理器的能力所及。摩尔定律失效的今天，关注“新“成员（GPU\FPGA\ASIC）为数据中心带...

linux

置顶原创 2021-05-20 22:59:08 1776 阅读

What is the difference among CPU, GPU, APU, FPGA, DSP, and Intel MIC?

CPUCPU is a general purpose processor. General Purpose in the sense that it is designed to perform a number of operations but the way these operations are performed may not be best for all applicati...

linux

置顶原创 2021-05-20 22:59:06 743 阅读

baidu apollo(2)—适配器模式

protobuf的原生支持apollo官方的介绍，在apollo platform源码中，其实也就是ros-indigo，可以看到protobuf相关的修改，通过百度的修改，在ros中不需要使用原有的msg机制来进行数据的序列化和反序列化，而是可以支持直接使用google的protobuf。适配器模式如何使用熟悉ros的应该都清楚原生ros中topic、node相关订阅...

linux

置顶原创 2021-05-20 22:59:05 1289 阅读

How do I learn machine learning?

To master Machine Learning (ML) one has to be good at maths, programming and domain knowledge. Domain knowledge (Eg: how to deal with images, audio, financial time series etc) changes from one class o...

linux

置顶原创 2021-05-20 22:59:04 317 阅读

基于yolov3的红绿灯识别

知乎原文。You only look once (YOLO) is a state-of-the-art, real-time objectdetection system. On a Pascal Titan X it processes images at 30 FPSand has a mAP of 57.9% on COCO test-dev.Yolo使用c和cuda实现...

linux

置顶原创 2021-05-20 22:59:03 3055 阅读

解决rosdep init 和 rosdep update出错

在安装ros时，执行rosdep命令时会出现超时或者连接被拒绝的错误。例如下面的连接超时，就是因为国内网络的原因，ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml]: <urlopen error timed o...

linux

置顶原创 2021-05-20 22:59:02 5837 阅读

禾赛+速腾 vs Velodyne+Ouster

本文只是对论文内容的简要总结，不对不同厂商激光雷达的好坏进行评价。1. LIBRE最近名古屋大学(Nagoya University)和autoware一起发表了一篇关于激光雷达数据集相关的论文《LIBRE: The Multiple 3D LiDAR Dataset》，数据集地址https://sites.google.com/g.sp.m.is.nagoya-u.ac.jp/libre...

linux

置顶原创 2021-05-20 22:59:01 1375 阅读

ros下使用google gflags

不同ubuntu版本对应不同的gflags版本利用sudo apt install libgflags-dev命令在不同ubuntu版本上安装的gflags的版本不同，ubuntu 16.04默认的版本为2.1，而ubuntu 18.04的版本为2.2。2.1和2.2版本在ros下的使用区别：2.1 cmake中通过find_package找不到gflags，而2.2可以找到。find_pa...

linux

置顶原创 2021-05-20 22:59:00 574 阅读

wsl2+kali-rolling+win kex+Connection refused 10061

wsl2+kali，可以在win10下运行一个效率高于virtualbox等虚拟机的linux，kali-win-kex基于VNC(In computing, Virtual Network Computing (VNC) is a graphical desktop-sharing system that uses the Remote Frame Buffer protocol (RFB) to remotely control another computer. It transmits the ke

linux

置顶原创 2021-05-20 22:58:59 936 阅读

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51CTO博客

lyf's blog

win10和ubuntu双系统下如何删除ubuntu

函数矩阵对矩阵求导

PCA原理补充

什么是Privileged app

kernel module signing

error: only position independent executables (PIE) are supported

Keeping Your App Responsive(ANR)

App权限—normal and dangerous permissions

HandlerThread的使用

What are root name servers?

authoritative name server vs recursive name server

DNS解析过程简述

如何提高大型工程的编译速度？

how to use TensorFlow?

machine-learning articles

After Go victory, challenges given to 'AlphaMahjong'

Unicode and UTF-8

calibrate sensors

An Introduction to the CAN Bus: How to Programmatically Control a Car

cuda The driver installation is unable to locate the kernel source

A Simple Makefile Tutorial

深入理解CPU和异构计算芯片GPU/FPGA/ASIC

What is the difference among CPU, GPU, APU, FPGA, DSP, and Intel MIC?

baidu apollo(2)—适配器模式

How do I learn machine learning?

基于yolov3的红绿灯识别

解决rosdep init 和 rosdep update出错

禾赛+速腾 vs Velodyne+Ouster

ros下使用google gflags

wsl2+kali-rolling+win kex+Connection refused 10061