# What is best-first search in artificial intelligence?

## What is best-first search in artificial intelligence?

Best first search uses the concept of a priority queue and heuristic search. It is a search algorithm that works on a specific rule. The aim is to reach the goal from the initial state via the shortest path.

## Which data structure is used for best-first search?

Best first search can be implemented within general search frame work via a priority queue, a data structure that will maintain the fringe in ascending order of f values. This search algorithm serves as combination of depth first and breadth first search algorithm.

What is greedy search in artificial intelligence?

Greedy Search: In greedy search, we expand the node closest to the goal node. The “closeness” is estimated by a heuristic h(x). Lower the value of h(x), closer is the node from the goal. Strategy: Expand the node closest to the goal state, i.e. expand the node with a lower h value.

### Is greedy best-first search optimal?

Greedy best-first search expands nodes with minimal h(n). It is not optimal, but is often efficient.

### Why best-first search is greedy?

Greedy BFS is greedy in expanding a potentially better successor of the current node. The difference between the two algorithms is in the loop that handles the evaluation of successors. Best-first search always exhausts the current node’s successors by evaluating them and continues with the best one from them: 4.

Where is best-first search algorithm used?

The idea of Best First Search is to use an evaluation function to decide which adjacent is most promising and then explore. Best First Search falls under the category of Heuristic Search or Informed Search. We use a priority queue to store costs of nodes.

#### What is best-first search approach?

Best first search is a traversal technique that decides which node is to be visited next by checking which node is the most promising one and then check it. For this it uses an evaluation function to decide the traversal.

#### Is best-first search and greedy best-first search same?

The generic best-first search algorithm selects a node for expansion according to an evaluation function. Greedy best-first search expands nodes with minimal h(n). It is not optimal, but is often efficient. A* search expands nodes with minimal f(n)=g(n)+h(n).

Why greedy best first search algorithm is not optimal?

Greedy best-first search expands nodes with minimal h(n). It is not optimal, but is often efficient. A* search expands nodes with minimal f(n)=g(n)+h(n). The space complexity of A* is still prohibitive.

## Is Best First Search Complete is Best First Search optimal?

The generic best-first search algorithm selects a node for expansion according to an evaluation function. Greedy best-first search expands nodes with minimal h(n). It is not optimal, but is often efficient. A* s complete and optimal, provided that h(n) is admissible (for TREE-SEARCH) or consistent (for GRAPH-SEARCH).