The document provides an introduction to graphs and graph algorithms. It defines graphs as consisting of vertices/nodes and edges connecting the nodes. It discusses different graph types including undirected graphs, directed graphs, and weighted graphs. It then describes various graph traversal algorithms like depth-first search, breadth-first search, and their applications to problems like finding paths, cycles, and connected components. Finally, it discusses algorithms for shortest paths in weighted graphs.
This document discusses graph algorithms and graph search techniques. It begins with an introduction to graphs and their representations as adjacency matrices and adjacency lists. It then covers graph terminology like vertices, edges, paths, cycles, and weighted graphs. Common graph search algorithms like breadth-first search and depth-first search are explained. Variations of these algorithms like recursive depth-first search and Dijkstra's algorithm for finding shortest paths in weighted graphs are also covered. Examples are provided throughout to illustrate the concepts and algorithms.
beginning with a tree T containing a single vertex
repeatedly adding the least cost edge between T and the rest of the graph
terminating when T spans all vertices
- The document discusses graphs and graph algorithms including definitions of graph terminology, representations of graphs, graph traversal algorithms like depth-first search and breadth-first search, and algorithms for finding minimum spanning trees like Kruskal's algorithm and Prim's algorithm.
- It provides detailed descriptions and pseudocode for graph traversal algorithms, algorithms to find connected components and articulation points, and minimum cost spanning tree algorithms.
- The document is intended as a curriculum for teaching graph algorithms and data structures.
The document discusses breadth-first search (BFS) algorithms for graphs. It explains that BFS runs in O(n^2) time on adjacency matrices due to checking all elements in each row, but in O(n+m) time on adjacency lists where m is the number of edges. It then describes how to modify BFS to record the shortest path between nodes using a predecessor array. The rest of the document provides examples of how BFS works and applications such as finding connected components and directed acyclic graphs.
A graph is a data structure consisting of nodes connected by edges. There are different types of graphs such as undirected graphs, directed graphs, connected graphs, and strongly connected graphs. Algorithms like depth-first search, Kosaraju's algorithm, and Warshall's algorithm can be used to find strongly connected components, biconnected components, and shortest paths in graphs.
Prim's algorithm is used to find the minimum spanning tree of a connected, undirected graph. It works by continuously adding edges to a growing tree that connects vertices. The algorithm maintains two lists - a closed list of vertices already included in the minimum spanning tree, and a priority queue of open vertices. It starts with a single vertex in the closed list. Then it selects the lowest cost edge that connects an open vertex to a closed one, adds it to the tree and updates the lists. This process repeats until all vertices are in the closed list and connected by edges in the minimum spanning tree. The algorithm runs in O(E log V) time when using a binary heap priority queue.
The document describes graphs and graph algorithms. It defines what a graph is composed of (vertices and edges) and different types of graphs like directed and undirected graphs. It provides terminology used with graphs like vertices, edges, paths, cycles, connectedness. It discusses ways of representing graphs through adjacency matrices and adjacency lists and provides examples. It also describes Dijkstra's algorithm, a graph algorithm to find the shortest path between vertices in a graph.
This document discusses graph neural networks and their applications. It describes how graph neural networks work by having each node aggregate information from its neighbors using neural networks. This allows each node to learn representations that are informed by its local graph structure. The document also discusses some key properties of graph neural networks, such as their ability to learn different computation graphs for different nodes, their failure cases when nodes are isomorphic, and how adding position information like anchors can help distinguish nodes.
This document discusses graph algorithms and graph search techniques. It begins with an introduction to graphs and their representations as adjacency matrices and adjacency lists. It then covers graph terminology like vertices, edges, paths, cycles, and weighted graphs. Common graph search algorithms like breadth-first search and depth-first search are explained. Variations of these algorithms like recursive depth-first search and Dijkstra's algorithm for finding shortest paths in weighted graphs are also covered. Examples are provided throughout to illustrate the concepts and algorithms.
beginning with a tree T containing a single vertex
repeatedly adding the least cost edge between T and the rest of the graph
terminating when T spans all vertices
- The document discusses graphs and graph algorithms including definitions of graph terminology, representations of graphs, graph traversal algorithms like depth-first search and breadth-first search, and algorithms for finding minimum spanning trees like Kruskal's algorithm and Prim's algorithm.
- It provides detailed descriptions and pseudocode for graph traversal algorithms, algorithms to find connected components and articulation points, and minimum cost spanning tree algorithms.
- The document is intended as a curriculum for teaching graph algorithms and data structures.
The document discusses breadth-first search (BFS) algorithms for graphs. It explains that BFS runs in O(n^2) time on adjacency matrices due to checking all elements in each row, but in O(n+m) time on adjacency lists where m is the number of edges. It then describes how to modify BFS to record the shortest path between nodes using a predecessor array. The rest of the document provides examples of how BFS works and applications such as finding connected components and directed acyclic graphs.
A graph is a data structure consisting of nodes connected by edges. There are different types of graphs such as undirected graphs, directed graphs, connected graphs, and strongly connected graphs. Algorithms like depth-first search, Kosaraju's algorithm, and Warshall's algorithm can be used to find strongly connected components, biconnected components, and shortest paths in graphs.
Prim's algorithm is used to find the minimum spanning tree of a connected, undirected graph. It works by continuously adding edges to a growing tree that connects vertices. The algorithm maintains two lists - a closed list of vertices already included in the minimum spanning tree, and a priority queue of open vertices. It starts with a single vertex in the closed list. Then it selects the lowest cost edge that connects an open vertex to a closed one, adds it to the tree and updates the lists. This process repeats until all vertices are in the closed list and connected by edges in the minimum spanning tree. The algorithm runs in O(E log V) time when using a binary heap priority queue.
The document describes graphs and graph algorithms. It defines what a graph is composed of (vertices and edges) and different types of graphs like directed and undirected graphs. It provides terminology used with graphs like vertices, edges, paths, cycles, connectedness. It discusses ways of representing graphs through adjacency matrices and adjacency lists and provides examples. It also describes Dijkstra's algorithm, a graph algorithm to find the shortest path between vertices in a graph.
This document discusses graph neural networks and their applications. It describes how graph neural networks work by having each node aggregate information from its neighbors using neural networks. This allows each node to learn representations that are informed by its local graph structure. The document also discusses some key properties of graph neural networks, such as their ability to learn different computation graphs for different nodes, their failure cases when nodes are isomorphic, and how adding position information like anchors can help distinguish nodes.
An overview of the most simple algorithms used in data structures for path finding. Dijkstra, Breadth First Search, Depth First Search, Best First Search and A-star
Naturally feel free to copy for assignments and all
This document discusses various graph algorithms including depth-first search (DFS), breadth-first search (BFS), union find, Kruskal's algorithm, Floyd-Warshall's algorithm, Dijkstra's algorithm, and bipartite graphs. It provides definitions, pseudocode, sample code, and sample problems for implementing each algorithm.
The document discusses graphs and graph algorithms. It defines graphs and their representations using adjacency lists and matrices. It then describes the Breadth-First Search (BFS) and Depth-First Search (DFS) algorithms for traversing graphs. BFS uses a queue to explore the neighbors of each vertex level-by-level, while DFS uses a stack to explore as deep as possible first before backtracking. Pseudocode and examples are provided to illustrate how the algorithms work.
The document discusses interval trees and breadth-first search (BFS) algorithms. Interval trees are used to maintain a set of intervals and efficiently find overlapping intervals given a query. BFS is a graph search algorithm that explores all neighboring vertices of a starting node before moving to neighbors of neighbors. BFS builds a breadth-first tree and calculates the shortest path distances from the source node in O(V+E) time and space.
This document discusses social network analysis in Python. It begins with an introduction and outline. It then covers topics like data representation using graphs, network properties measured at the network, group, and node level, and visualization. Network properties include characteristic path length, clustering coefficient, degree distribution, and more. Representations include adjacency matrices, incidence matrices, adjacency lists, and incidence lists. NetworkX is highlighted as a tool for working with graphs in Python.
A graph search (or traversal) technique visits every node exactly one in a systematic fashion. Two standard graph search techniques have been widely used: Depth-First Search (DFS) Breadth-First Search (BFS)
Connected components are subgraphs where any two vertices are connected by paths and disconnected from other graphs. The algorithm uses disjoint sets to determine if vertices are in the same component. Depth-first search (DFS) and breadth-first search (BFS) are common graph traversal algorithms. DFS uses a stack and visits the root node first before children. BFS uses a queue and visits nodes level-by-level starting from the root. Spanning trees connect all vertices without cycles, having n-1 edges for a graph with n vertices. Biconnected components are maximal subgraphs without articulation points whose removal would disconnect the graph.
The network layer is responsible for transporting data segments from source to destination hosts. It encapsulates segments into datagrams and delivers them to the transport layer. Network layer protocols run on every host and router. Routers examine header fields to forward datagrams appropriately based on destination addresses. The network layer handles addressing, routing, and intermediate forwarding of datagrams between source and destination hosts.
Graph Analytics - From the Whiteboard to Your Toolbox - Sam LermaPyData
This document provides an introduction to graph theory concepts and working with graph data in Python. It begins with basic graph definitions and real-world graph examples. Various graph concepts are then demonstrated visually, such as vertices, edges, paths, cycles, and graph properties. Finally, it discusses working with graph data structures and algorithms in the NetworkX library in Python, including graph generation, analysis, and visualization. The overall goal is to introduce readers to graph theory and spark their interest in further exploration.
graphin-c1.png
graphin-c1.txt
1: 2
2: 3 8
3: 4
4: 5
5: 3
6: 7
7: 3 6 8
8: 1 9
9: 1
graphin-c2.jpg
graphin-c2.txt
1: 2 9
2: 3 8
3: 4
4: 5 9
5: 3
6: 7
7: 3 6 8
8: 1
9:
graphin-DAG.png
graphin-DAG.txt
1: 2
2: 3 8
3: 4
4: 5
5: 9
6: 4 7
7: 3 8
8: 9
9:
CS 340 Programming Assignment III:
Topological Sort
Description: You are to implement the Depth-First Search (DFS) based algorithm for (i)
testing whether or not the input directed graph G is acyclic (a DAG), and (ii) if G is a DAG,
topologically sorting the vertices of G and outputting the topologically sorted order.
I/O Specifications: You will prompt the user from the console to select an input graph
filename, including the sample file graphin.txt as an option. The graph input files must be of
the following adjacency list representation where each xij is the j'th neighbor of vertex i (vertex
labels are 1 through n):
1: x11 x12 x13 ...
2: x21 x22 x23 ...
.
.
n: xn1 xn2 xn3 ...
Your output will be to the console. You will first output whether or not the graph is acyclic. If
the graph is NOT acyclic, then you will output the set of back edges you have detected during
DFS. Otherwise, if the graph is acyclic, then you will output the vertices in topologically
sorted order.
Algorithmic specifications:
Your algorithm must use DFS appropriately and run in O(E + V) time on any input graph. You will
need to keep track of edge types and finish times so that you can use DFS for detecting
cyclicity/acyclicity and topologically sorting if the graph is a DAG. You may implement your graph
class as you wish so long as your overall algorithm runs correctly and efficiently.
What to Turn in: You must turn in a single zipped file containing your source code, a Makefile
if your language must be compiled, appropriate input and output files, and a README file
indicating how to execute your program (especially if not written in C++ or Java). Refer to
proglag.pdf for further specifications.
This assignment is due by MIDNIGHT of Monday, February 19. Late submissions
carry a minus 40% per-day late penalty.
Sheet1Name:Possible:Score:Comments:10Graph structure with adjacency list representationDFS16Correct and O(V+E) time10Detecting cycles, is graph DAG?Topological Sort16Correctness of Topo-Sort algorithm and output18No problems in compilation and execution? Non-compiling projects receive max total 10 points, and code that compiles but crashes during execution receives max total 18 points.700Total
&"Helvetica,Regular"&12&K000000&P
Sheet2
&"Helvetica,Regular"&12&K000000&P
Sheet3
&"Helvetica,Regular"&12&K000000&P
DFS and topological sort
CS340
Depth first search
breadth
depth
Search "deeper" whenever possible
*example shows discovery times
Depth first search
Input: G = (V,E), directed or undirected.
No source vertex is given!
Output: 2 timestamps on each vertex:
v.d discovery time
v.f finishing time
These will be useful ...
This document discusses graphs and graph data structures. It defines a graph as a pictorial representation of a set of objects connected by links, with the objects represented as vertices and the links as edges. It provides definitions and examples of basic graph terminology like vertices, edges, adjacency, and different types of graphs like directed vs undirected graphs. It also covers graph implementations using adjacency matrices and adjacency lists, as well as common graph algorithms like depth-first search and breadth-first search. Finally, it lists some applications of graphs like social networks, maps, and computer networks.
This document defines key graph concepts like paths, cycles, degrees of vertices, and different types of graphs like trees, forests, and directed acyclic graphs. It also describes common graph representations like adjacency matrices and lists. Finally, it covers graph traversal algorithms like breadth-first search and depth-first search, outlining their time complexities and providing examples of their process.
Algorithm Design and Complexity - Course 7Traian Rebedea
The document discusses algorithms for graphs, including breadth-first search (BFS) and depth-first search (DFS). BFS uses a queue to traverse nodes level-by-level from a starting node, computing the shortest path. DFS uses a stack, exploring as far as possible along each branch before backtracking, and computes discovery and finish times for nodes. Both algorithms color nodes white, gray, black to track explored status and maintain predecessor pointers to reconstruct paths. Common graph representations like adjacency lists and matrices are also covered.
Neo4j comes with enhanced connectivity of data and whiteboard friendly paradigm. It also brings a gremlin in your code : one of the supported graph query language brings a refreshing look at how one can search for data in a vast and interconnect web of data. Gremlin provides an abstract layer that make it easy to express your business logic without fighting with the code. It may even change your mind on object oriented programming.
This document provides an overview of graphs and graph algorithms. It begins with an introduction to graphs, including definitions of vertices, edges, directed/undirected graphs, and graph representations using adjacency matrices and lists. It then covers graph traversal algorithms like depth-first search and breadth-first search. Minimum spanning trees and algorithms for finding them like Kruskal's algorithm are also discussed. The document provides examples and pseudocode for the algorithms. It analyzes the time complexity of the graph algorithms. Overall, the document provides a comprehensive introduction to fundamental graph concepts and algorithms.
The document discusses the algorithms of breadth-first search (BFS) and depth-first search (DFS) on graphs. It provides pseudocode for BFS and DFS, and examples of running the algorithms on sample graphs. Key points include:
- BFS uses a queue to explore all neighbors of a vertex before moving to the next level. It finds the shortest paths from the source.
- DFS uses recursion to explore as deep as possible before backtracking. It identifies tree edges, back edges, and forward edges.
- Both BFS and DFS run in O(V+E) time on a graph with V vertices and E edges.
This document provides information about graphs and graph algorithms. It discusses different graph representations including adjacency matrices and adjacency lists. It also describes common graph traversal algorithms like depth-first search and breadth-first search. Finally, it covers minimum spanning trees and algorithms to find them, specifically mentioning Kruskal's algorithm.
This document defines key graph terminology and concepts. It begins by defining what a graph is composed of - vertices and edges. It then discusses directed vs undirected graphs and defines common graph terms like adjacent vertices, paths, cycles, and more. The document also covers different ways to represent graphs, such as adjacency matrices and adjacency lists. Finally, it briefly introduces common graph search methods like breadth-first search and depth-first search.
Analysis insight about a Flyball dog competition team's performanceroli9797
Insight of my analysis about a Flyball dog competition team's last year performance. Find more: https://github.com/rolandnagy-ds/flyball_race_analysis/tree/main
An overview of the most simple algorithms used in data structures for path finding. Dijkstra, Breadth First Search, Depth First Search, Best First Search and A-star
Naturally feel free to copy for assignments and all
This document discusses various graph algorithms including depth-first search (DFS), breadth-first search (BFS), union find, Kruskal's algorithm, Floyd-Warshall's algorithm, Dijkstra's algorithm, and bipartite graphs. It provides definitions, pseudocode, sample code, and sample problems for implementing each algorithm.
The document discusses graphs and graph algorithms. It defines graphs and their representations using adjacency lists and matrices. It then describes the Breadth-First Search (BFS) and Depth-First Search (DFS) algorithms for traversing graphs. BFS uses a queue to explore the neighbors of each vertex level-by-level, while DFS uses a stack to explore as deep as possible first before backtracking. Pseudocode and examples are provided to illustrate how the algorithms work.
The document discusses interval trees and breadth-first search (BFS) algorithms. Interval trees are used to maintain a set of intervals and efficiently find overlapping intervals given a query. BFS is a graph search algorithm that explores all neighboring vertices of a starting node before moving to neighbors of neighbors. BFS builds a breadth-first tree and calculates the shortest path distances from the source node in O(V+E) time and space.
This document discusses social network analysis in Python. It begins with an introduction and outline. It then covers topics like data representation using graphs, network properties measured at the network, group, and node level, and visualization. Network properties include characteristic path length, clustering coefficient, degree distribution, and more. Representations include adjacency matrices, incidence matrices, adjacency lists, and incidence lists. NetworkX is highlighted as a tool for working with graphs in Python.
A graph search (or traversal) technique visits every node exactly one in a systematic fashion. Two standard graph search techniques have been widely used: Depth-First Search (DFS) Breadth-First Search (BFS)
Connected components are subgraphs where any two vertices are connected by paths and disconnected from other graphs. The algorithm uses disjoint sets to determine if vertices are in the same component. Depth-first search (DFS) and breadth-first search (BFS) are common graph traversal algorithms. DFS uses a stack and visits the root node first before children. BFS uses a queue and visits nodes level-by-level starting from the root. Spanning trees connect all vertices without cycles, having n-1 edges for a graph with n vertices. Biconnected components are maximal subgraphs without articulation points whose removal would disconnect the graph.
The network layer is responsible for transporting data segments from source to destination hosts. It encapsulates segments into datagrams and delivers them to the transport layer. Network layer protocols run on every host and router. Routers examine header fields to forward datagrams appropriately based on destination addresses. The network layer handles addressing, routing, and intermediate forwarding of datagrams between source and destination hosts.
Graph Analytics - From the Whiteboard to Your Toolbox - Sam LermaPyData
This document provides an introduction to graph theory concepts and working with graph data in Python. It begins with basic graph definitions and real-world graph examples. Various graph concepts are then demonstrated visually, such as vertices, edges, paths, cycles, and graph properties. Finally, it discusses working with graph data structures and algorithms in the NetworkX library in Python, including graph generation, analysis, and visualization. The overall goal is to introduce readers to graph theory and spark their interest in further exploration.
graphin-c1.png
graphin-c1.txt
1: 2
2: 3 8
3: 4
4: 5
5: 3
6: 7
7: 3 6 8
8: 1 9
9: 1
graphin-c2.jpg
graphin-c2.txt
1: 2 9
2: 3 8
3: 4
4: 5 9
5: 3
6: 7
7: 3 6 8
8: 1
9:
graphin-DAG.png
graphin-DAG.txt
1: 2
2: 3 8
3: 4
4: 5
5: 9
6: 4 7
7: 3 8
8: 9
9:
CS 340 Programming Assignment III:
Topological Sort
Description: You are to implement the Depth-First Search (DFS) based algorithm for (i)
testing whether or not the input directed graph G is acyclic (a DAG), and (ii) if G is a DAG,
topologically sorting the vertices of G and outputting the topologically sorted order.
I/O Specifications: You will prompt the user from the console to select an input graph
filename, including the sample file graphin.txt as an option. The graph input files must be of
the following adjacency list representation where each xij is the j'th neighbor of vertex i (vertex
labels are 1 through n):
1: x11 x12 x13 ...
2: x21 x22 x23 ...
.
.
n: xn1 xn2 xn3 ...
Your output will be to the console. You will first output whether or not the graph is acyclic. If
the graph is NOT acyclic, then you will output the set of back edges you have detected during
DFS. Otherwise, if the graph is acyclic, then you will output the vertices in topologically
sorted order.
Algorithmic specifications:
Your algorithm must use DFS appropriately and run in O(E + V) time on any input graph. You will
need to keep track of edge types and finish times so that you can use DFS for detecting
cyclicity/acyclicity and topologically sorting if the graph is a DAG. You may implement your graph
class as you wish so long as your overall algorithm runs correctly and efficiently.
What to Turn in: You must turn in a single zipped file containing your source code, a Makefile
if your language must be compiled, appropriate input and output files, and a README file
indicating how to execute your program (especially if not written in C++ or Java). Refer to
proglag.pdf for further specifications.
This assignment is due by MIDNIGHT of Monday, February 19. Late submissions
carry a minus 40% per-day late penalty.
Sheet1Name:Possible:Score:Comments:10Graph structure with adjacency list representationDFS16Correct and O(V+E) time10Detecting cycles, is graph DAG?Topological Sort16Correctness of Topo-Sort algorithm and output18No problems in compilation and execution? Non-compiling projects receive max total 10 points, and code that compiles but crashes during execution receives max total 18 points.700Total
&"Helvetica,Regular"&12&K000000&P
Sheet2
&"Helvetica,Regular"&12&K000000&P
Sheet3
&"Helvetica,Regular"&12&K000000&P
DFS and topological sort
CS340
Depth first search
breadth
depth
Search "deeper" whenever possible
*example shows discovery times
Depth first search
Input: G = (V,E), directed or undirected.
No source vertex is given!
Output: 2 timestamps on each vertex:
v.d discovery time
v.f finishing time
These will be useful ...
This document discusses graphs and graph data structures. It defines a graph as a pictorial representation of a set of objects connected by links, with the objects represented as vertices and the links as edges. It provides definitions and examples of basic graph terminology like vertices, edges, adjacency, and different types of graphs like directed vs undirected graphs. It also covers graph implementations using adjacency matrices and adjacency lists, as well as common graph algorithms like depth-first search and breadth-first search. Finally, it lists some applications of graphs like social networks, maps, and computer networks.
This document defines key graph concepts like paths, cycles, degrees of vertices, and different types of graphs like trees, forests, and directed acyclic graphs. It also describes common graph representations like adjacency matrices and lists. Finally, it covers graph traversal algorithms like breadth-first search and depth-first search, outlining their time complexities and providing examples of their process.
Algorithm Design and Complexity - Course 7Traian Rebedea
The document discusses algorithms for graphs, including breadth-first search (BFS) and depth-first search (DFS). BFS uses a queue to traverse nodes level-by-level from a starting node, computing the shortest path. DFS uses a stack, exploring as far as possible along each branch before backtracking, and computes discovery and finish times for nodes. Both algorithms color nodes white, gray, black to track explored status and maintain predecessor pointers to reconstruct paths. Common graph representations like adjacency lists and matrices are also covered.
Neo4j comes with enhanced connectivity of data and whiteboard friendly paradigm. It also brings a gremlin in your code : one of the supported graph query language brings a refreshing look at how one can search for data in a vast and interconnect web of data. Gremlin provides an abstract layer that make it easy to express your business logic without fighting with the code. It may even change your mind on object oriented programming.
This document provides an overview of graphs and graph algorithms. It begins with an introduction to graphs, including definitions of vertices, edges, directed/undirected graphs, and graph representations using adjacency matrices and lists. It then covers graph traversal algorithms like depth-first search and breadth-first search. Minimum spanning trees and algorithms for finding them like Kruskal's algorithm are also discussed. The document provides examples and pseudocode for the algorithms. It analyzes the time complexity of the graph algorithms. Overall, the document provides a comprehensive introduction to fundamental graph concepts and algorithms.
The document discusses the algorithms of breadth-first search (BFS) and depth-first search (DFS) on graphs. It provides pseudocode for BFS and DFS, and examples of running the algorithms on sample graphs. Key points include:
- BFS uses a queue to explore all neighbors of a vertex before moving to the next level. It finds the shortest paths from the source.
- DFS uses recursion to explore as deep as possible before backtracking. It identifies tree edges, back edges, and forward edges.
- Both BFS and DFS run in O(V+E) time on a graph with V vertices and E edges.
This document provides information about graphs and graph algorithms. It discusses different graph representations including adjacency matrices and adjacency lists. It also describes common graph traversal algorithms like depth-first search and breadth-first search. Finally, it covers minimum spanning trees and algorithms to find them, specifically mentioning Kruskal's algorithm.
This document defines key graph terminology and concepts. It begins by defining what a graph is composed of - vertices and edges. It then discusses directed vs undirected graphs and defines common graph terms like adjacent vertices, paths, cycles, and more. The document also covers different ways to represent graphs, such as adjacency matrices and adjacency lists. Finally, it briefly introduces common graph search methods like breadth-first search and depth-first search.
Similar to FADML 06 PPC Graphs and Traversals.pdf (20)
Analysis insight about a Flyball dog competition team's performanceroli9797
Insight of my analysis about a Flyball dog competition team's last year performance. Find more: https://github.com/rolandnagy-ds/flyball_race_analysis/tree/main
End-to-end pipeline agility - Berlin Buzzwords 2024Lars Albertsson
We describe how we achieve high change agility in data engineering by eliminating the fear of breaking downstream data pipelines through end-to-end pipeline testing, and by using schema metaprogramming to safely eliminate boilerplate involved in changes that affect whole pipelines.
A quick poll on agility in changing pipelines from end to end indicated a huge span in capabilities. For the question "How long time does it take for all downstream pipelines to be adapted to an upstream change," the median response was 6 months, but some respondents could do it in less than a day. When quantitative data engineering differences between the best and worst are measured, the span is often 100x-1000x, sometimes even more.
A long time ago, we suffered at Spotify from fear of changing pipelines due to not knowing what the impact might be downstream. We made plans for a technical solution to test pipelines end-to-end to mitigate that fear, but the effort failed for cultural reasons. We eventually solved this challenge, but in a different context. In this presentation we will describe how we test full pipelines effectively by manipulating workflow orchestration, which enables us to make changes in pipelines without fear of breaking downstream.
Making schema changes that affect many jobs also involves a lot of toil and boilerplate. Using schema-on-read mitigates some of it, but has drawbacks since it makes it more difficult to detect errors early. We will describe how we have rejected this tradeoff by applying schema metaprogramming, eliminating boilerplate but keeping the protection of static typing, thereby further improving agility to quickly modify data pipelines without fear.
Enhanced Enterprise Intelligence with your personal AI Data Copilot.pdfGetInData
Recently we have observed the rise of open-source Large Language Models (LLMs) that are community-driven or developed by the AI market leaders, such as Meta (Llama3), Databricks (DBRX) and Snowflake (Arctic). On the other hand, there is a growth in interest in specialized, carefully fine-tuned yet relatively small models that can efficiently assist programmers in day-to-day tasks. Finally, Retrieval-Augmented Generation (RAG) architectures have gained a lot of traction as the preferred approach for LLMs context and prompt augmentation for building conversational SQL data copilots, code copilots and chatbots.
In this presentation, we will show how we built upon these three concepts a robust Data Copilot that can help to democratize access to company data assets and boost performance of everyone working with data platforms.
Why do we need yet another (open-source ) Copilot?
How can we build one?
Architecture and evaluation
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Data and AI
Discussion on Vector Databases, Unstructured Data and AI
https://www.meetup.com/unstructured-data-meetup-new-york/
This meetup is for people working in unstructured data. Speakers will come present about related topics such as vector databases, LLMs, and managing data at scale. The intended audience of this group includes roles like machine learning engineers, data scientists, data engineers, software engineers, and PMs.This meetup was formerly Milvus Meetup, and is sponsored by Zilliz maintainers of Milvus.
The Ipsos - AI - Monitor 2024 Report.pdfSocial Samosa
According to Ipsos AI Monitor's 2024 report, 65% Indians said that products and services using AI have profoundly changed their daily life in the past 3-5 years.
STATATHON: Unleashing the Power of Statistics in a 48-Hour Knowledge Extravag...sameer shah
"Join us for STATATHON, a dynamic 2-day event dedicated to exploring statistical knowledge and its real-world applications. From theory to practice, participants engage in intensive learning sessions, workshops, and challenges, fostering a deeper understanding of statistical methodologies and their significance in various fields."
The Building Blocks of QuestDB, a Time Series Databasejavier ramirez
Talk Delivered at Valencia Codes Meetup 2024-06.
Traditionally, databases have treated timestamps just as another data type. However, when performing real-time analytics, timestamps should be first class citizens and we need rich time semantics to get the most out of our data. We also need to deal with ever growing datasets while keeping performant, which is as fun as it sounds.
It is no wonder time-series databases are now more popular than ever before. Join me in this session to learn about the internal architecture and building blocks of QuestDB, an open source time-series database designed for speed. We will also review a history of some of the changes we have gone over the past two years to deal with late and unordered data, non-blocking writes, read-replicas, or faster batch ingestion.
2. Graphs
A Graph G = (V, E) consists of the
following:
• A set of Vertices or Nodes V
– Nodes may have one or more labels
• A set of Edges E where each edge
connects vertices of V
– An edge usually defines a connection or
relationship between vertices or nodes
– The edges can be undirected or directed
– Each edge can have one or more labels
– Usually there is at most one edge between
vertices, there could be multiple edges
between the same nodes.
– Normally an edge connects two vertices, but
in general we could have hyper-edges
3. Graphs
A Graph G = (V, E) consists of the
following:
• A set of Vertices or Nodes V
– Nodes may have one or more labels
• A set of Edges E where each edge
connects vertices of V
– An edge usually defines a connection or
relationship between vertices or nodes
– The edges can be undirected or directed
– Each edge can have one or more labels
– Usually there is at most one edge between
vertices, there could be multiple edges
between the same nodes.
– Normally an edge connects two vertices, but
in general we could have hyper-edges
4. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
5. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
6. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
7. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
8. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
9. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
10. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
11. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
12. Some Applications of Graphs
• Maps, Routes
• Layouts
• Circuits and Networks
• Relationships
• Constraints
• Dependencies
• Flow Charts
• State Machines
21. TRAVERSAL OF UNDIRECTED GRAPHS
Partha P Chakrabarti
Indian Institute of Technology Kharagpur
22. Undirected Graph
An Undirected Graph G = (V, E) consists of
the following:
• A set of Vertices or Nodes V
• A set of Edges E where each edge
connects two vertices of V
Example: Figure 1
V = {0,1,2,3,4,5,6,7,8}
E = {(0,1), (0,8), (0,3),(1,7), (2,3), (2,5), (2,7),
(3,4), (4,8), (5,6)}
Successor Function: succ(i) = {set of nodes
to which node i is connected}
Example: Succ(2) = {3,5,7}
Weighted Undirected Graphs: Such Graphs
may have weights on edges (Figure 2)
Figure 1
Figure 2
24. Basic Traversal Algorithm (Depth First Search) I
Global Data: G = (V,E)
visited [i] indicates if node i is visited. For
all nodes j visited [j] is initialized to 0
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) Dfs(j)
}
}
25. Basic Traversal Algorithm (Depth First Search) II
Global Data: G = (V,E)
visited [i] indicates if node i is visited. For
all nodes j visited [j] is initialized to 0
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) Dfs(j)
}
}
26. Basic Traversal Algorithm (Depth First Search) III
Global Data: G = (V,E)
visited [i] indicates if node i is visited. For
all nodes j visited [j] is initialized to 0
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) Dfs(j)
}
}
27. Cycle Detection
Global Data: G = (V,E)
visited [i] indicates if node i is visited. For all
nodes j visited [j] is initialized to 0
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) Dfs(j)
}
}
// Cycle Detection //
28. Path Finding
Global Data: G = (V,E)
visited [i] indicates if node i is visited. For all nodes
j visited [j] is initialized to 0
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) {
Dfs(j) }
}
}
// Tree Edge, Back Edge, Parent Links, Tracing
Paths //
29. Connected Components
Global Data: G = (V,E)
Visited[i], comp[i] all initialized to 0
count = 0;
Algorithm components() {
for each node k do {
if visited [k] == 0 { count = count + 1;
DfComp_S(k) }
DfComp(node) {
visited[node] = 1; comp[node] = count;
for each j in succ(node) do {
if (visited [j] ==0) DfComp(j)
}
}
30. Depth-First Numbering & Time Stamping
Global Data: G = (V,E)
Visited[i], comp[i] all initialized to 0
count = 0;
Algorithm components() {
for each node k do {
if visited [k] == 0 { count = count + 1;
DfComp_S(k) }
DfComp(node) {
visited[node] = 1; comp[node] = count;
for each j in succ(node) do {
if (visited [j] ==0) {
DfComp(j)
}
}
}
31. Breadth-First Search
Global Data: G = (V,E)
Visited[i] all initialized to 0
Queue Q initially {}
BFS(k) {
visited [k] = 1; Q = {k};
While Q != {} {
j = DeQueue (Q);
if visited[j] == 0 {
visited [j] = 1;
For each k in succ (j) EnQueue(Q,k);
}
}
/Parent links, Shortest Length Path Finding in
unweighted graphs/
32. Pathfinding in Weighted Undirected Graphs I
Global Data: G = (V,E)
Visited[i] all initialized to 0,
Cost[j] all initialized to INFINITY
Ordered Queue Q initially {}
BFSW(k) {
visited [k] = 1; cost [k] = 0; Q = {k};
While Q != {} {
j = DeQueue (Q);
if visited[j] == 0 {
visited [j] = 1;
For each k in succ (j) {
if cost[k] > cost[j] + c[j,k]
cost[k] = cost[j] + c[j,k];
EnQueue(Q,k);}
}
}
33. Pathfinding in Weighted Undirected Graphs II
Global Data: G = (V,E)
Visited[i] all initialized to 0,
Cost[j] all initialized to INFINITY
Ordered Queue Q initially {}
BFSW(k) {
visited [k] = 1; cost [k] = 0; Q = {k};
While Q != {} {
j = DeQueue (Q);
if visited[j] == 0 {
visited [j] = 1;
For each k in succ (j) {
if cost[k] > cost[j] + c[j,k]
cost[k] = cost[j] + c[j,k];
EnQueue(Q,k);}
}
}
35. TRAVERSAL OF DIRECTED GRAPHS
Partha P Chakrabarti
Indian Institute of Technology Kharagpur
36. Directed Graphs
An Undirected Graph G = (V, E) consists of
the following:
• A set of Vertices or Nodes V
• A set of DIRECTED Edges E where each
edge connects two vertices of V. The
edge is an ORDERED pair of vertices
Successor Function: succ(i) = {set of nodes
to which node i is connected}
Directed Acyclic Graphs (DAGs): Such
Graphs have no cycles (Figure 2)
Weighted Undirected Graphs: Such Graphs
may have weights on edges (Figure 3). We
can also have Weighted DAGs
Figure 1
Figure 3
Figure 2
37. Basic Traversal Algorithm (Depth First Search)
Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
}
}
38. Traversing the Complete Graph by DFS
Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
succ(i) = {set of nodes to which node i is
connected}
Dfs(node) {
visited[node] = 1;
for each j in succ(node) do {
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
}
}
39. Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
Entry[i] = node entry sequence / initially 0 /
Exit[i] = node exit sequence / initially 0 /
succ(i) = {set of nodes to which node i is connected}
numb = 0;
Dfs(node) {
visited[node] = 1; numb = numb+1;
Entry[node] = numb;
for each j in succ(node) do
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
numb = numb + 1;
Exit[node] = numb;
}
Entry-Exit Numbering
40. Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially NULL
/
Entry[i] = node entry sequence / initially 0 /
Exit[i] = node exit sequence / initially 0 /
succ(i) = {set of nodes to which node i is connected}
numb = 0;
Dfs(node) {
visited[node] = 1; numb = numb+1;
Entry[node] = numb;
for each j in succ(node) do
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
numb = numb + 1;
Exit[node] = numb;
}
Tree Edge, Back Edge, Forward Edge, Cross Edge
Edge (u,v) is
Tree Edge or Forward Edge: if & only if
Entry[u] < Entry[v] < Exit[v] < Exit[u]
Back Edge: if & only if
Entry[v] < Entry [u] < Exit [u] < Exit [v]
Cross Edge: if & only if
Entry [v] < Exit [v] < Entry [u] < Exit [u]
41. Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
Entry[i] = node entry sequence / initially 0 /
Exit[i] = node exit sequence / initially 0 /
succ(i) = {set of nodes to which node i is connected}
numb = 0;
Dfs(node) {
visited[node] = 1; numb = numb+1;
Entry[node] = numb;
for each j in succ(node) do
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
numb = numb + 1;
Exit[node] = numb;
}
Reachability, Paths, Cycles, Components
Edge (u,v) is
Tree Edge or Forward Edge: if & only if
Entry[u] < Entry[v] < Exit[v] < Exit[u]
Back Edge: if & only if
Entry[v] < Entry [u] < Exit [u] < Exit [v]
Cross Edge: if & only if
Entry [v] < Exit [v] < Entry [u] < Exit [u]
42. Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
Entry[i] = node entry sequence / initially 0 /
Exit[i] = node exit sequence / initially 0 /
succ(i) = {set of nodes to which node i is connected}
numb = 0;
Dfs(node) {
visited[node] = 1; numb = numb+1;
Entry[node] = numb;
for each j in succ(node) do
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
numb = numb + 1;
Exit[node] = numb;
}
Directed Acyclic Graphs
43. Global Data: G = (V,E)
visited [i] indicates if node i is visited. / initially 0 /
Parent[i] = parent of a node in the Search / initially
NULL /
Entry[i] = node entry sequence / initially 0 /
Exit[i] = node exit sequence / initially 0 /
succ(i) = {set of nodes to which node i is connected}
numb = 0; numb1 = 0;
Dfs(node) {
visited[node] = 1; numb = numb+1;
Entry[node] = numb;
for each j in succ(node) do
if (visited [j] ==0) { Parent[j] = node;
Dfs(j) }
numb1 = numb1 + 1;
Exit[node] = numb1;
}
Topological Ordering, Level Values