What are hypergraphs used for?
Hypergraphs have shown their power as a tool to understand problems in a wide variety of scientific field. Moreover it well known now that hypergraph theory is a very useful tool to resolve optimization problems such as scheduling problems, location problems and so on.
What is a hypergraph database?
A hypergraph is a graph data model in which a relationship (called a hyperedge) can connect any number of given nodes. While a property graph permits a relationship to have only one start node and one end node, the hypergraph model allows any number of nodes at either end of a relationship.
What is a directed hypergraph?
A directed hypergraph consists of a set of vertices V and a set of hyperarcs H, where a hyperarc is a pair , S non empty subset of V and v ∈ V . S is also called the tail of the hyperarc, while v is the head. Several notions, such as paths and cycles can be naturally extended from digraphs to directed hypergraphs.
What is Titan DB?
Titan is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster. Titan is a transactional database that can support thousands of concurrent users executing complex graph traversals in real time.
What is hypergraph partitioning?
In simple terms, the hypergraph partitioning problem can be defined as the task of dividing a hypergraph into two or more roughly equal-sized parts such that a cost function on the hyperedges connecting vertices in different parts is minimized.
Is Cassandra a graph database?
The combination of all the components comprising Apache Cassandra and DataStax Graph Database makes Cassandra a graphical database. Therefore, you can retrieve complex data with a detailed and easy-to-read representation. Additionally, these components make Cassandra the most popular database.
Is Redis a graph database?
RedisGraph is a graph database developed from scratch on top of Redis, using the new Redis Modules API to extend Redis with new commands and capabilities. Its main features include: Simple, fast indexing and querying. Data stored in RAM using memory-efficient custom data structures.
What is multigraph in data structure?
In mathematics, and more specifically in graph theory, a multigraph is a graph which is permitted to have multiple edges (also called parallel edges), that is, edges that have the same end nodes. Thus two vertices may be connected by more than one edge.
Does multigraph have self-loop?
A MultiGraph holds undirected edges. Self loops are allowed.
Who uses Cassandra DB?
One open source application, Apache Cassandra, enables organisations to process large volumes of fast moving data in a reliable and scalable way. That’s why companies like Facebook, Instagram and Netflix use Apache Cassandra for mission-critical features.
Is Cassandra a document database?
Yes, Apache Cassandra is a NoSQL Database. Apache Cassandra is a type of NoSQL Columnar Databases. Apache Cassandra is a Column-Oriented Database. NoSQL database is a non-relational database capable of handling Structured, Semi-Structured and Un-Structured data.
What is a Redis module?
Redis modules are dynamic libraries that can be loaded into Redis at startup, or using the MODULE LOAD command. Redis exports a C API, in the form of a single C header file called redismodule.
What is Redis stream?
Redis Streams is an append-only data structure that helps in various streaming use cases like real-time messaging (RTM), message broker, etc. Before diving into Redis Streams, let us first go through one of the other constructs which Redis provides for inter service communication: Redis Pub/Sub.
What is multigraph example?
When multiple edges are allowed between any pair of vertices, the graph is called a multigraph. Examples of a simple graph, a multigraph and a graph with loop are shown in Figure 8.9. Figure 8.9. Examples of (a) simple graph, (b) multigraph, and (c) graph with loop.
Does multigraph have self loops?
A MultiGraph holds undirected edges. Self loops are allowed. Nodes can be arbitrary (hashable) Python objects with optional key/value attributes.
What is the difference between graph and multigraph?
A graph is defined to be a simple graph if there is at most one edge connecting any pair of vertices and an edge does not loop to connect a vertex to itself. When multiple edges are allowed between any pair of vertices, the graph is called a multigraph.
Does Netflix still use Cassandra?
Cassandra, with its distributed architecture, was a natural choice, and by 2013, most of Netflix’s data was housed there, and Netflix still uses Cassandra today.