包括 1)elasticsearch-7.6.2 ①elasticsearch-analysis-ik-7.6.2 ②ingest-attachment-7.6.2 2)elasticsearch-head-master 3)kibana-7.6.2-windows-x86_64 4)node.js
2024-08-13 10:13:25 571.6MB elasticsearch 源码软件 data
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LPDDR5 SDRAM is a high-speed synchronous SDRAM device internally configured with 1 channel containing either 16 or 8 DQ signals. The bank architecture is user-selectable, and can be either eight banks (8B Mode), four banks with four bank groups (BG Mode), or sixteen banks (16B Mode). See 2.2.3 for more information. LPDDR5(Low Power Double Data Rate 5)协议是针对移动设备的一种高速、低功耗内存标准,由JEDEC固态技术协会制定。这个标准旨在提高数据传输速率,同时降低能耗,以满足现代智能手机、平板电脑和其他便携式设备的需求。 LPDDR5内存模块采用同步动态随机存取存储器(SDRAM)设计,内部结构包含1个通道,通道内有16或8条数据信号线(DQ)。这种设计允许更高效的数据处理,尤其是在高数据速率的应用中。协议提供三种不同的银行架构供用户选择:八银行模式(8B Mode)、四银行四银行组模式(BG Mode)以及十六银行模式(16B Mode)。每种模式都有其特定的优势,例如,更多的银行可以提高并行操作能力,从而提升内存性能。 在八银行模式下,内存被划分为八个独立的访问单元,每个银行可以独立地进行读写操作,提高了并发处理能力。四银行四银行组模式进一步扩展了并行性,通过四个银行组,每个组内有两个银行可以同时工作。而在十六银行模式下,内存的并发处理能力达到最大,适合需要极高数据吞吐量的应用。 LPDDR5相比于前一代LPDDR4/4X,在速度上有显著提升。它支持高达6400MT/s的数据传输速率,相比LPDDR4X的最高3200MT/s翻了一倍。更高的速度意味着更快的系统响应时间和更流畅的多任务处理。此外,LPDDR5引入了能量效率优化的特性,如Data Bus Inversion (DBI)技术,该技术通过反转数据总线上的信号来减少电源切换,从而降低功耗。还有Write X功能,当写入操作为零时,会跳过不必要的电源转换,进一步节省能源。 另外,LPDDR5引入了UDIMM(User Data Integrity Monitor)和CMD Error Correction Code (ECC)等错误检测和纠正机制,增强了数据的完整性和系统的稳定性。UDIMM能够实时监测数据错误,而CMD ECC则对命令和地址总线进行纠错,确保内存操作的准确性。 LPDDR5协议通过提供更高的数据速率、更低的功耗以及增强的错误纠正机制,提升了移动设备的性能和能效。随着移动设备对计算能力和续航能力要求的不断提升,LPDDR5成为了新一代移动设备内存的标准选择。
2024-08-02 17:45:39 10.51MB
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### LPDDR4(低功耗双倍数据速率4)JESD209-4E标准解析 #### 标准概述 《低功耗双倍数据速率4 (LPDDR4)》是JEDEC(固态技术协会)发布的一项重要标准,其最新版本为JESD209-4E,修订于2021年6月,并于2024年6月正式发布。这一标准主要针对低功耗内存技术进行了详细规定,旨在促进内存产品的标准化、互换性和性能提升。 #### LPDDR4技术简介 **LPDDR4**是一种专为移动设备设计的低功耗动态随机存取内存技术。它继承了前代LPDDR3的优点,并在带宽、能效等方面进行了显著改进。该技术广泛应用于智能手机、平板电脑等便携式电子设备中,以满足这些设备对高性能与低功耗的双重需求。 #### 技术特点 1. **高带宽:**LPDDR4支持高达3200MT/s的数据传输速率,相较于LPDDR3有了显著提高。 2. **低功耗:**通过多种节能机制和技术,如更低的工作电压(1.1V),LPDDR4能够在保持高性能的同时大幅度降低能耗。 3. **可扩展性:**LPDDR4支持更灵活的容量扩展方案,包括多芯片封装技术,以满足不同应用的需求。 4. **可靠性与稳定性:**采用了先进的纠错码(ECC)技术,提高了数据传输的可靠性和系统的整体稳定性。 5. **易用性:**LPDDR4简化了设计复杂度,使得设计者能够更容易地将其集成到各种系统中。 #### 技术细节 - **工作电压:**LPDDR4采用1.1V的标准工作电压,相比前代产品降低了功耗。 - **数据传输速率:**最高可达3200MT/s,有效提升了数据吞吐量。 - **地址/命令/控制信号:**这些信号的接口被优化,以提高信号完整性并减少电磁干扰。 - **电源管理:**引入了多种电源管理模式,如深度睡眠模式,进一步降低了功耗。 - **存储器组织:**LPDDR4支持更高密度的存储单元组织,有助于实现更大容量的内存模组。 - **温度范围:**支持广泛的温度范围,确保在不同环境下的稳定运行。 #### 标准制定目的 - **消除误解:**标准的制定有助于消除制造商与购买者之间的误解。 - **产品互换性:**通过标准化,促进了不同品牌内存产品之间的互换性。 - **性能改进:**标准的制定有利于推动技术进步,从而提高内存产品的整体性能。 - **便于选择:**为购买者提供了明确的选择指南,帮助他们快速找到适合的应用产品。 #### 标准适用范围 JEDEC标准适用于所有内存制造商和用户,无论是JEDEC成员还是非成员。这些标准不仅在国内得到广泛应用,在国际市场上也具有很高的认可度。 #### 结论 LPDDR4 JESD209-4E标准代表了当前低功耗内存领域的最先进技术。通过不断的技术迭代和完善,LPDDR4不仅在性能上实现了突破,还在功耗控制方面取得了显著成就,极大地推动了移动计算领域的发展。对于设计师和制造商来说,理解和掌握这一标准将有助于他们开发出更加高效、节能的产品。
2024-07-31 15:17:38 6.33MB LPDDR4
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Thoughtful Data Science: A Programmer's Toolset for Data Analysis and Artificial Intelligence with Python, Jupyter Notebook, and PixieDust Bridge the gap between developer and data scientist by creating a modern open-source, Python-based toolset that works with Jupyter Notebook, and PixieDust. Key Features Think deeply as a developer about your strategy and toolset in data science Discover the best tools that will suit you as a developer in your data analysis Accelerate the road to data insight as a programmer using Jupyter Notebook Deep dive into multiple industry data science use cases Book Description Thoughtful Data Science brings new strategies and a carefully crafted programmer's toolset to work with modern, cutting-edge data analysis. This new approach is designed specifically to give developers more efficiency and power to create cutting-edge data analysis and artificial intelligence insights. Industry expert David Taieb bridges the gap between developers and data scientists by creating a modern open-source, Python-based toolset that works with Jupyter Notebook, and PixieDust. You'll find the right balance of strategic thinking and practical projects throughout this book, with extensive code files and Jupyter projects that you can integrate with your own data analysis. David Taieb introduces four projects designed to connect developers to important industry use cases in data science. The first is an image recognition application with TensorFlow, to meet the growing importance of AI in data analysis. The second analyses social media trends to explore big data issues and natural language processing. The third is a financial portfolio analysis application using time series analysis, pivotal in many data science applications today. The fourth involves applying graph algorithms to solve data problems. Taieb wraps up with a deep look into the future of data science for developers and his views on AI for data science. What you will learn Bridge the gap between developer and data scientist with a Python-based toolset Get the most out of Jupyter Notebooks with new productivity-enhancing tools Explore and visualize data using Jupyter Notebooks and PixieDust Work with and assess the impact of artificial intelligence in data science Work with TensorFlow, graphs, natural language processing, and time series Deep dive into multiple industry data science use cases Look into the future of data analysis and where to develop your skills Who this book is for This book is for established developers who want to bridge the gap between programmers and data scientists. With the introduction of PixieDust from its creator, the book will also be a great desk companion for the already accomplished Data Scientist. Some fluency in data interpretation and visualization is also assumed since this book addresses data professionals such as business and general data analysts. It will be helpful to have some knowledge of Python, using Python libraries, and some proficiency in web development. Table of Contents Chapter 1 Perspectives on Data Science from a Developer Chapter 2 Data Science at Scale with Jupyter Notebooks and PixieDust Chapter 3 PixieApp under the Hood Chapter 4 Deploying PixieApps to the Web with the PixieGateway Server Chapter 5 Best Practices and Advanced PixieDust Concepts Chapter 6 Image Recognition with TensorFlow Chapter 7 Big Data Twitter Sentiment Analysis Chapter 8 Financial Time Series Analysis and Forecasting Chapter 9 US Domestic Flight Data Analysis Using Graphs Chapter 10 Final Thoughts
2024-07-28 12:25:03 22.87MB Data  Science AI  Financial
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《Python数据科学手册》是Jake VanderPlas撰写的一本针对数据科学和机器学习工具的权威指南,特别适合已经熟悉Python编程的科学家和数据分析师。这本书的2023年版全面更新,旨在帮助读者掌握使用Python进行数据分析的核心工具。 1. **IPython与Jupyter**: IPython是一个交互式计算环境,而Jupyter Notebook是基于Web的界面,让科学家能够以交互方式编写和展示代码、数据和可视化结果。这两个工具结合,为数据科学家提供了强大且灵活的工作平台,支持多语言,便于合作和文档记录。 2. **NumPy**: NumPy是Python的一个核心库,提供了多维数据结构`ndarray`,用于高效存储和处理大型数组数据。NumPy还包含数学函数库,支持向量和矩阵运算,是进行数值计算的基础。 3. **Pandas**: Pandas是构建在NumPy之上的数据处理库,其DataFrame对象提供了一种高效的方式来组织和操作结构化或标签数据。DataFrame允许用户轻松地清洗、转换和合并数据,非常适合进行数据预处理工作。 4. **Matplotlib**: Matplotlib是Python最常用的绘图库,支持创建各种静态、动态和交互式的可视化。它提供了一套类似于MATLAB的API,可以绘制2D和3D图形,并支持自定义颜色、样式、标签等元素,满足复杂的数据可视化需求。 5. **Scikit-Learn**: Scikit-Learn是Python中广泛使用的机器学习库,提供了大量预包装的算法,包括监督学习(如分类、回归和聚类)和无监督学习方法。Scikit-Learn的API设计简洁,使得构建和评估机器学习模型变得简单。 6. **其他相关工具**: 除了上述工具,书中可能还会涵盖其他辅助工具,如用于数据处理的Pandas扩展库(如Dask、Pyspark),用于统计分析的Statsmodels,以及用于深度学习的TensorFlow和Keras等。 通过本书,读者将能够: - 学习如何利用IPython和Jupyter Notebook进行高效的数据探索和分析。 - 掌握NumPy和Pandas进行数据存储、清洗、转换和操纵的技巧。 - 使用Matplotlib创建各种图表,以视觉方式表达数据。 - 了解并应用Scikit-Learn构建机器学习模型,包括训练、验证和优化模型。 - 探索和整合其他相关工具,以扩展Python数据科学工具箱。 Jake VanderPlas,作为本书的作者,拥有丰富的经验,他在Google Research担任软件工程师,专注于开发支持数据密集型研究的工具,包括Scikit-Learn在内的Python库,确保了书中的内容既实用又前沿。这本书是Python数据科学家必备的参考资源,无论你是初学者还是经验丰富的专业人士,都能从中受益。
2024-07-24 11:37:14 19.7MB python
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python data science handbook-english version python data science handbook-english version
2024-07-24 11:30:15 20.47MB python
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利用安卓现有漏洞直接像安卓10一样直接使用Android/data目录或者像安卓11一样授权Android/data目录,并且无需shizuku,只是简单写了一个授权和查看文件列表的实例,剩下直接参照别人开源的就可以,都差不多。
2024-07-15 01:41:44 156KB android
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大数据中的云网络(Cloud Networking for Big Data)-2015年Springer英文原版,0积分
2024-07-12 14:01:50 3.84MB
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Data Structures & Algorithms Using JavaScript by Hemant Jain English | 17 May 2017 | ASIN: B072J44X62 | 614 Pages | AZW3 | 4.22 MB This book is about the usage of data structures and algorithms in computer programming. Designing an efficient algorithm to solve a computer science problem is a skill of Computer programmer. This is the skill which tech companies like Google, Amazon, Microsoft, Adobe and many others are looking for in an interview. This book assumes that you are a JavaScript language developer. You are not an expert in JavaScript language, but you are well familiar with concepts of references, functions, arrays and recursion. In the start of this book, we will be revising the JavaScript language fundamentals that will be used throughout this book. We will be looking into some of the problems in arrays and recursion too. Then in the coming chapter, we will be looking into complexity analysis. Then will look into the various data structures and their algorithms. We will be looking into a linked list, stack, queue, trees, heap, hash table and graphs. We will be looking into sorting, searching techniques. Then we will be looking into algorithm analysis, we will be looking into brute force algorithms, greedy algorithms, divide and conquer algorithms, dynamic programming, reduction, and backtracking. In the end, we will be looking into the system design that will give a systematic approach for solving the design problems in an Interview.
2024-07-09 23:30:26 4.22MB Data Structures Algorithms JavaScript
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资源包中有.csv文件和.mat两种格式文件 这组数据代表了在不同操作条件下运行的实验。特别是,研究了刀具的磨损情况(Goebel,1996)。采用三种不同类型的传感器(声发射传感器、振动传感器、电流传感器)进行采样数据。数据被组织在一个1x167的matlab结构数组中。
2024-07-08 21:18:34 14.35MB matlab 数据集
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