Rakuten Kobo

Indkøbskurv

Vare(r) ikke tilgængelig til køb

Gennemgå din indkøbskurv. Du kan fjerne de(n) tilgængelige vare(r) nu, ellers fjerner vi det automatisk ved kassen.

varervare

- Ubegrænset adgang til e-bøger
  
  Ubegrænset adgang til lydbøger
  
  Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions
  
  Få 1 kredit hver måned til en lydbog efter eget valg
  
  Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions
  
  Ubegrænset adgang til e-bøger
  
  Ubegrænset adgang til lydbøger
  
  Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions
  lydbog
  af ,
  
  Ledig:
  
  . Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions.
  
  Forudbestilling
  1 lydbog om måneden
  
  + GRATIS 30-dages prøve
  
  Særtilbud
  
  Få 1 kredit hver måned til at bytte til en lydbog efter eget valg
  
  *Ingen forpligtelse, annuller når som helst
  
  GRATIS

varervare

Ubegrænset adgang til e-bøger

Ubegrænset adgang til lydbøger

Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions

Få 1 kredit hver måned til en lydbog efter eget valg

Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions

Ubegrænset adgang til e-bøger

Ubegrænset adgang til lydbøger

Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions
lydbog
af ,

Ledig:
. Ingen forpligtelse, aflys når som helst på kobo.com/account/subscriptions.

Forudbestilling
1 lydbog om måneden

+ GRATIS 30-dages prøve

Særtilbud

Få 1 kredit hver måned til at bytte til en lydbog efter eget valg

*Ingen forpligtelse, annuller når som helst

GRATIS

Anbefalet til dig

Proteção Em Tempos De Dados Digitais

af Alexandre Luiz M.a.machado ...

O crescimento do comércio eletrônico no Brasil trouxe à tona desafios importantes relacionados à proteção de dados pessoais e aos direitos do consumidor. Nesse cenário, a LGPD e o CDC atuam de forma complementar para garantir que os consumidores tenham seus dados tratados com responsabilidade e seus direitos respeitados. Essa interseção cria um arcabouço legal robusto que protege o consumidor na ... Læs mere

42,00 kr. eller Gratis med Kobo Plus

O crescimento do comércio eletrônico no Brasil trouxe à tona desafios importantes relacionados à proteção de dados pessoais e aos direitos do consumidor. Nesse cenário, a LGPD e o CDC atuam de forma complementar para garantir que os consumidores tenham seus dados tratados com responsabilidade e seus direitos respeitados. Essa interseção cria um arcabouço legal robusto que protege o consumidor na
... Læs mere
Stream Processing with Apache Spark

Mastering Structured Streaming and Spark Streaming

af Gerard Maas, Francois Garillot ...

Before you can build analytics tools to gain quick insights, you first need to know how to process data in real time. With this practical guide, developers familiar with Apache Spark will learn how to put this in-memory framework to use for streaming data. You’ll discover how Spark enables you to write streaming jobs in almost the same way you write batch jobs.Authors Gerard Maas and François ... Læs mere

339,61 kr.

Before you can build analytics tools to gain quick insights, you first need to know how to process data in real time. With this practical guide, developers familiar with Apache Spark will learn how to put this in-memory framework to use for streaming data. You’ll discover how Spark enables you to write streaming jobs in almost the same way you write batch jobs.Authors Gerard Maas and François
... Læs mere
Smart Technologies in Data Science and Communication

Proceedings of SMART-DSC 2021

Redigeret af Sanjoy Kumar Saha, Paul S. Pang, Debnath Bhattacharyya ...

Serier serie Springer Nature Proceedings excluding Computer Science
This book features high-quality, peer-reviewed research papers presented at the Fourth International Conference on Smart Technologies in Data Science and Communication (SMART-DSC 2021), held in Koneru Lakshmaiah Education Foundation, Guntur, Andhra Pradesh, India, on 18–19 February 2021. It includes innovative and novel contributions in the areas of data analytics, communication, and soft ... Læs mere

1.681,11 kr.

This book features high-quality, peer-reviewed research papers presented at the Fourth International Conference on Smart Technologies in Data Science and Communication (SMART-DSC 2021), held in Koneru Lakshmaiah Education Foundation, Guntur, Andhra Pradesh, India, on 18–19 February 2021. It includes innovative and novel contributions in the areas of data analytics, communication, and soft
... Læs mere
View Updating and Relational Theory

Solving the View Update Problem

af C.J. Date ...

Views are virtual tables. That means they should be updatable, just as "real" or base tables are. In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones. But view updating has always been a controversial topic. Ever since the relational model first appeared, there has been widespread skepticism as to whether (in general) view updating is ... Læs mere

181,11 kr.

Views are virtual tables. That means they should be updatable, just as "real" or base tables are. In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones. But view updating has always been a controversial topic. Ever since the relational model first appeared, there has been widespread skepticism as to whether (in general) view updating is
... Læs mere
Cyber-Physical Systems: Modelling and Intelligent Control

Redigeret af Alla G. Kravets, Alexander A. Bolshakov, Maxim Shcherbakov ...

Serier serie Engineering (R0)
This book highlights original approaches of modelling and intelligent control of cyber-physical systems covering both theoretical and practical aspects. The novel contribution of the book covers the transformation of scientific research and their results into applications for cyber-physical systems design and operation during the whole life cycle in different domains.Given its scope, the book ... Læs mere

1.344,86 kr.

This book highlights original approaches of modelling and intelligent control of cyber-physical systems covering both theoretical and practical aspects. The novel contribution of the book covers the transformation of scientific research and their results into applications for cyber-physical systems design and operation during the whole life cycle in different domains.Given its scope, the book
... Læs mere
Data Science Career Guide Interview Preparation

af Gradient Publication ...

Do YOU want to work as a data scientist? Then proceed to read. The Bureau of Labor Statistics states that a data scientist makes, on average, $98,230 a year.Over the previous three years, there has been a 31% increase in data science job ads, but only a 14% increase in data science job searches. There is a scarcity of about 150,000 data science workers as a result of this strong demand.Data ... Læs mere

39,22 kr.

Do YOU want to work as a data scientist? Then proceed to read. The Bureau of Labor Statistics states that a data scientist makes, on average, $98,230 a year.Over the previous three years, there has been a 31% increase in data science job ads, but only a 14% increase in data science job searches. There is a scarcity of about 150,000 data science workers as a result of this strong demand.Data
... Læs mere
Data-Driven Farming

Harnessing the Power of AI and Machine Learning in Agriculture

Redigeret af Syed Nisar Hussain Bukhari ...

In the dynamic realm of agriculture, artificial intelligence (AI) and machine learning (ML) emerge as catalysts for unprecedented transformation and growth. The emergence of big data, Internet of Things (IoT) sensors, and advanced analytics has opened up new possibilities for farmers to collect and analyze data in real-time, make informed decisions, and increase efficiency. AI and ML are key ... Læs mere

589,99 kr.

In the dynamic realm of agriculture, artificial intelligence (AI) and machine learning (ML) emerge as catalysts for unprecedented transformation and growth. The emergence of big data, Internet of Things (IoT) sensors, and advanced analytics has opened up new possibilities for farmers to collect and analyze data in real-time, make informed decisions, and increase efficiency. AI and ML are key
... Læs mere
Frontiers of Digital Transformation

Applications of the Real-World Data Circulation Paradigm

Redigeret af Kazuya Takeda, Ichiro Ide, Victor Muhandiki ...

Serier serie Computer Science (R0)
Proposing the concept of real-world data circulation (RWDC), this book presents various practical and industry-related studies in human, mechanical, and social data domains. RWDC is a new field of study, established by the information technology (IT) community.In the real world, the speed of data transmission between computers surpassed that of human communications long ago and has since expanded ... Læs mere

1.176,74 kr.

Proposing the concept of real-world data circulation (RWDC), this book presents various practical and industry-related studies in human, mechanical, and social data domains. RWDC is a new field of study, established by the information technology (IT) community.In the real world, the speed of data transmission between computers surpassed that of human communications long ago and has since expanded
... Læs mere
DevOps Fundamentals Practice Test

af iCertify Training ...

Master the essentials of DevOps with this comprehensive guide and practice test resource, meticulously aligned with the latest PeopleCert guidelines. This book provides a thorough understanding of DevOps principles, practices, and tools, making it an ideal companion for anyone preparing for the DevOps Fundamentals certification.Inside, you'll find expertly crafted sample questions and realistic ... Læs mere

125,70 kr. eller Gratis med Kobo Plus

Master the essentials of DevOps with this comprehensive guide and practice test resource, meticulously aligned with the latest PeopleCert guidelines. This book provides a thorough understanding of DevOps principles, practices, and tools, making it an ideal companion for anyone preparing for the DevOps Fundamentals certification.Inside, you'll find expertly crafted sample questions and realistic
... Læs mere
Proceedings of the 2nd International Conference on Emerging Technologies and Intelligent Systems

ICETIS 2022, Volume 2

Redigeret af Mohammed A. Al-Sharafi, Mostafa Al-Emran, Mohammed Naji Al-Kabi, Khaled Shaalan ...

Serier serie Springer Nature Proceedings excluding Computer Science
This book sheds light on the recent research directions in intelligent systems and their applications. It involves four main themes: artificial intelligence and data science, recent trends in software engineering, emerging technologies in education, and intelligent health informatics. The discussion of the most recent designs, advancements, and modifications of intelligent systems, as well as ... Læs mere

1.756,86 kr.

This book sheds light on the recent research directions in intelligent systems and their applications. It involves four main themes: artificial intelligence and data science, recent trends in software engineering, emerging technologies in education, and intelligent health informatics. The discussion of the most recent designs, advancements, and modifications of intelligent systems, as well as
... Læs mere
National Cyber Summit (NCS) Research Track 2021

Redigeret af Kim-Kwang Raymond Choo, Tommy Morris, Gilbert Peterson, Eric Imsand ...

Serier serie Springer Nature Proceedings excluding Computer Science
This book presents findings from the papers accepted at the Cyber Security Education Stream and Cyber Security Technology Stream of The National Cyber Summit’s Research Track, reporting on latest advances on topics ranging from software security to cyber-attack detection and modelling to the use of machine learning in cyber security to legislation and policy to surveying of small businesses to ... Læs mere

756,49 kr.

This book presents findings from the papers accepted at the Cyber Security Education Stream and Cyber Security Technology Stream of The National Cyber Summit’s Research Track, reporting on latest advances on topics ranging from software security to cyber-attack detection and modelling to the use of machine learning in cyber security to legislation and policy to surveying of small businesses to
... Læs mere
ChatGPT Handbuch – In 7 Tagen zum KI-Profi: Mach dich fit für die Zukunft mit der Kraft der künstlichen Intelligenz!

KI einfach erklärt

af Felix Schröder ...

Serier serie KI einfach erklärt
Mach dich fit für die Zukunft mit der Kraft der künstlichen Intelligenz!Dieses umfassende Handbuch ist dein Schlüssel, um ChatGPT und andere KI-Tools in nur 7 Tagen zu meistern. Ob du Anfänger bist oder schon erste Erfahrungen gesammelt hast – mit dieser praxisorientierten Anleitung lernst du, wie du die neueste Technologie effektiv für dich arbeiten lässt. Was erwartet dich?Die P.R.O.M.P.T. ... Læs mere

49,99 kr.

Mach dich fit für die Zukunft mit der Kraft der künstlichen Intelligenz!Dieses umfassende Handbuch ist dein Schlüssel, um ChatGPT und andere KI-Tools in nur 7 Tagen zu meistern. Ob du Anfänger bist oder schon erste Erfahrungen gesammelt hast – mit dieser praxisorientierten Anleitung lernst du, wie du die neueste Technologie effektiv für dich arbeiten lässt. Was erwartet dich?Die P.R.O.M.P.T.
... Læs mere
Computational Methods and Data Engineering

Proceedings of ICCMDE 2021

Redigeret af Vijayan K. Asari, Vijendra Singh, Rajkumar Rajasekaran, R. B. Patel ...

Serier serie Springer Nature Proceedings excluding Computer Science
The book features original papers from International Conference on Computational Methods and Data Engineering (ICCMDE 2021), organized by School of Computer Science and Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India, during November 25–26, 2021. The book covers innovative and cutting-edge work of researchers, developers, and practitioners from academia and industry ... Læs mere

1.681,11 kr.

The book features original papers from International Conference on Computational Methods and Data Engineering (ICCMDE 2021), organized by School of Computer Science and Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India, during November 25–26, 2021. The book covers innovative and cutting-edge work of researchers, developers, and practitioners from academia and industry
... Læs mere
Machine Learning and Big Data Analytics (Proceedings of International Conference on Machine Learning and Big Data Analytics (ICMLBDA) 2021)

Redigeret af Rajiv Misra, Rudrapatna K. Shyamasundar, Amrita Chaturvedi, Rana Omer ...

Serier serie Springer Nature Proceedings excluding Computer Science
This edited volume on machine learning and big data analytics (Proceedings of ICMLBDA 2021) is intended to be used as a reference book for researchers and practitioners in the disciplines of computer science, electronics and telecommunication, information science, and electrical engineering. Machine learning and Big data analytics represent a key ingredients in the industrial applications for new ... Læs mere

1.344,86 kr.

This edited volume on machine learning and big data analytics (Proceedings of ICMLBDA 2021) is intended to be used as a reference book for researchers and practitioners in the disciplines of computer science, electronics and telecommunication, information science, and electrical engineering. Machine learning and Big data analytics represent a key ingredients in the industrial applications for new
... Læs mere
Why AI/Data Science Projects Fail

af Joyce Weiner ...

Serier serie Synthesis Lectures on Computation and Analytics
Recent data shows that 87% of Artificial Intelligence/Big Data projects don’t make it into production (VB Staff, 2019), meaning that most projects are never deployed. This book addresses five common pitfalls that prevent projects from reaching deployment and provides tools and methods to avoid those pitfalls. Along the way, stories from actual experience in building and deploying data science ... Læs mere

208,86 kr.

Recent data shows that 87% of Artificial Intelligence/Big Data projects don’t make it into production (VB Staff, 2019), meaning that most projects are never deployed. This book addresses five common pitfalls that prevent projects from reaching deployment and provides tools and methods to avoid those pitfalls. Along the way, stories from actual experience in building and deploying data science
... Læs mere
Digitalisation: Opportunities and Challenges for Business

Volume 1

Redigeret af Bahaaeddin Alareeni, Allam Hamdan, Reem Khamis, Rim El Khoury ...

Serier serie Springer Nature Proceedings excluding Computer Science
This book addresses the implications of technology, entrepreneurship, and business ‎‎development gadgets ‎for applications in societies. In this book proceedings, we attempt to address the importance and impact of digitalization and ‎on business development in the context ‎of economic ‎diversity, that is through various propositions of ‎modern technology and entrepreneurial ‎actions, and through ... Læs mere

1.756,86 kr.

This book addresses the implications of technology, entrepreneurship, and business ‎‎development gadgets ‎for applications in societies. In this book proceedings, we attempt to address the importance and impact of digitalization and ‎on business development in the context ‎of economic ‎diversity, that is through various propositions of ‎modern technology and entrepreneurial ‎actions, and through
... Læs mere
QlikView 11 para Desarrolladores

af Barry Harmsen, Miguel Angel Garcia ...

Los ejercicios de este libro tienen un enfoque de tutorial paso a paso y en los que al mismo tiempo se van presentando mejores practicas de desarrollo. El libro esta estructurado de forma que puede ser leido de inicio a fin o leer solamente partes del mismo.Este libro va dirigido a desarrolladores y usuarios que quieren aprender a crear aplicaciones de Inteligencia de Negocios con QlikView. ... Læs mere

371,24 kr. eller Gratis med Kobo Plus

Los ejercicios de este libro tienen un enfoque de tutorial paso a paso y en los que al mismo tiempo se van presentando mejores practicas de desarrollo. El libro esta estructurado de forma que puede ser leido de inicio a fin o leer solamente partes del mismo.Este libro va dirigido a desarrolladores y usuarios que quieren aprender a crear aplicaciones de Inteligencia de Negocios con QlikView.
... Læs mere
Digital Transformation

Exploring the Impact of Digital Transformation on Organizational Processes

Redigeret af Larisa Ivascu, Lucian-Ionel Cioca, Banciu Doina, Florin Gheorghe Filip ...

Serier serie Intelligent Technologies and Robotics (R0)
The book offers aspects related to the health and process safety field, complex approaches to artificial intelligence, the role of accounting and auditing in the digital age, DT in agriculture, artificial intelligence in the maritime domain, education, management, sustainability and mobile technologies in learning. Digitization, digitalization and digital transformation (DT) are important for ... Læs mere

1.681,11 kr.

The book offers aspects related to the health and process safety field, complex approaches to artificial intelligence, the role of accounting and auditing in the digital age, DT in agriculture, artificial intelligence in the maritime domain, education, management, sustainability and mobile technologies in learning. Digitization, digitalization and digital transformation (DT) are important for
... Læs mere
Advances in Data Analytics for Influencer Marketing: An Interdisciplinary Approach

Redigeret af Soumi Dutta, Álvaro Rocha, Pushan Kumar Dutta, Pronaya Bhattacharya, Ramanjeet Singh ...

Serier serie Intelligent Technologies and Robotics (R0)
In the ever-evolving landscape of digital marketing, influencer marketing has emerged as a game-changer, captivating audiences and driving brand engagement like never before. However, success in this dynamic field requires more than just intuition—it demands a mastery of data analytics and an interdisciplinary approach. Introducing this groundbreaking book equips marketers, analysts, and business ... Læs mere

1.512,99 kr.

In the ever-evolving landscape of digital marketing, influencer marketing has emerged as a game-changer, captivating audiences and driving brand engagement like never before. However, success in this dynamic field requires more than just intuition—it demands a mastery of data analytics and an interdisciplinary approach. Introducing this groundbreaking book equips marketers, analysts, and business
... Læs mere
Amazon DynamoDB - The Definitive Guide

Explore enterprise-ready, serverless NoSQL with predictable, scalable performance

af Aman Dhingra, Mike Mackay ...

Harness the potential and scalability of DynamoDB to effortlessly construct resilient, low-latency databases Key FeaturesDiscover how DynamoDB works behind the scenes to make the most of its featuresLearn how to keep latency and costs minimal even when scaling upIntegrate DynamoDB with other AWS services to create a full data analytics systemPurchase of the print or Kindle book includes a free PDF ... Læs mere

276,74 kr. eller Gratis med Kobo Plus

Harness the potential and scalability of DynamoDB to effortlessly construct resilient, low-latency databases Key FeaturesDiscover how DynamoDB works behind the scenes to make the most of its featuresLearn how to keep latency and costs minimal even when scaling upIntegrate DynamoDB with other AWS services to create a full data analytics systemPurchase of the print or Kindle book includes a free PDF
... Læs mere
Apache Spark 2: Data Processing and Real-Time Analytics

Master complex big data processing, stream analytics, and machine learning with Apache Spark

af Romeo Kienzler, Md. Rezaul Karim, Sridhar Alla, Siamak Amirghodsi, Meenakshi Rajendran, Broderick Hall, Shuen Mei ...

Build efficient data flow and machine learning programs with this flexible, multi-functional open-source cluster-computing frameworkKey FeaturesMaster the art of real-time big data processing and machine learningExplore a wide range of use-cases to analyze large dataDiscover ways to optimize your work by using many features of Spark 2.x and ScalaBook DescriptionApache Spark is an in-memory, ... Læs mere

290,24 kr. eller Gratis med Kobo Plus

Build efficient data flow and machine learning programs with this flexible, multi-functional open-source cluster-computing frameworkKey FeaturesMaster the art of real-time big data processing and machine learningExplore a wide range of use-cases to analyze large dataDiscover ways to optimize your work by using many features of Spark 2.x and ScalaBook DescriptionApache Spark is an in-memory,
... Læs mere
Building Modern Data Applications Using Databricks Lakehouse

Develop, optimize, and monitor data pipelines on Databricks

af Will Girten ...

Get up to speed with the Databricks Data Intelligence Platform to build and scale modern data applications, leveraging the latest advancements in data engineeringKey FeaturesLearn how to work with real-time data using Delta Live TablesUnlock insights into the performance of data pipelines using Delta Live TablesApply your knowledge to Unity Catalog for robust data security and governancePurchase ... Læs mere

276,74 kr. eller Gratis med Kobo Plus

Get up to speed with the Databricks Data Intelligence Platform to build and scale modern data applications, leveraging the latest advancements in data engineeringKey FeaturesLearn how to work with real-time data using Delta Live TablesUnlock insights into the performance of data pipelines using Delta Live TablesApply your knowledge to Unity Catalog for robust data security and governancePurchase
... Læs mere
Essential Guide to LLMOps

Implementing effective strategies for Large Language Models in deployment and continuous improvement

af Ryan Doan ...

Unlock the secrets to mastering LLMOps with innovative approaches to streamline AI workflows, improve model efficiency, and ensure robust scalability, revolutionizing your language model operations from start to finishKey FeaturesGain a comprehensive understanding of LLMOps, from data handling to model governanceLeverage tools for efficient LLM lifecycle management, from development to ... Læs mere

276,74 kr. eller Gratis med Kobo Plus

Unlock the secrets to mastering LLMOps with innovative approaches to streamline AI workflows, improve model efficiency, and ensure robust scalability, revolutionizing your language model operations from start to finishKey FeaturesGain a comprehensive understanding of LLMOps, from data handling to model governanceLeverage tools for efficient LLM lifecycle management, from development to
... Læs mere
Bases de données orientées graphes avec Neo4j

Manipuler et exploiter vos bases de données orientées graphes

af Amine Lies Benhenni, François-Xavier Bois ...

Serier serie Blanche
Ces dernières années, les besoins relatifs au traitement des données ont évolué à un rythme soutenu. Les sites web aux millions d'utilisateurs (réseaux sociaux, plates-formes de diffusion de contenus) sont à l'origine de l'essor de la plus dynamique des familles de moteurs de données : le NoSQL.Une base de données optimisée pour le big dataParmi les bases de données NoSQL, celles orientées ... Læs mere

164,30 kr. eller Gratis med Kobo Plus

Ces dernières années, les besoins relatifs au traitement des données ont évolué à un rythme soutenu. Les sites web aux millions d'utilisateurs (réseaux sociaux, plates-formes de diffusion de contenus) sont à l'origine de l'essor de la plus dynamique des familles de moteurs de données : le NoSQL.Une base de données optimisée pour le big dataParmi les bases de données NoSQL, celles orientées
... Læs mere

Kobo Rakuten

e-læsere

Apps

Tilbehør

Indkøbskurv

Du får VIP-behandling!

Din indkøbskurv er tom

Ledig:

1 lydbog om måneden

+ GRATIS 30-dages prøve

Ledig:

1 lydbog om måneden

+ GRATIS 30-dages prøve

Anbefalet til dig

Databehandling e-bøger

Proteção Em Tempos De Dados Digitais

Stream Processing with Apache Spark

Smart Technologies in Data Science and Communication

View Updating and Relational Theory

Cyber-Physical Systems: Modelling and Intelligent Control

Data Science Career Guide Interview Preparation

Data-Driven Farming

Frontiers of Digital Transformation

DevOps Fundamentals Practice Test

Proceedings of the 2nd International Conference on Emerging Technologies and Intelligent Systems

National Cyber Summit (NCS) Research Track 2021

ChatGPT Handbuch – In 7 Tagen zum KI-Profi: Mach dich fit für die Zukunft mit der Kraft der künstlichen Intelligenz!

Computational Methods and Data Engineering

Machine Learning and Big Data Analytics (Proceedings of International Conference on Machine Learning and Big Data Analytics (ICMLBDA) 2021)

Why AI/Data Science Projects Fail

Digitalisation: Opportunities and Challenges for Business

QlikView 11 para Desarrolladores

Digital Transformation

Advances in Data Analytics for Influencer Marketing: An Interdisciplinary Approach

Amazon DynamoDB - The Definitive Guide

Apache Spark 2: Data Processing and Real-Time Analytics

Building Modern Data Applications Using Databricks Lakehouse

Essential Guide to LLMOps

Bases de données orientées graphes avec Neo4j