MullOverThings

Useful tips for everyday

# What are the differences between uniform-cost search and breadth-first search techniques?

## What are the differences between uniform-cost search and breadth-first search techniques?

In breadth-first search, the goal test on the node is performed when it is first generated. But in uniform-cost search, goal test on the node is performed when it is selected for expansion. This is because the first node generated could be a sub-optimal path.

## What is the difference between greedy best-first search and a search?

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). A* s complete and optimal, provided that h(n) is admissible (for TREE-SEARCH) or consistent (for GRAPH-SEARCH).

## Is uniform-cost search a greedy search?

Greedy Search doesn’t go back up the tree – it picks the lowest value and commits to that. Uniform-Cost will pick the lowest total cost from the entire tree.

## What are the main differences between hill climbing search vs best-first search?

Best-first search calculates the value of ALL neighboring nodes and then iterates with the best one. Simple hill climbing calculates the value of each neighbouring node in turn and iterates as soon as it finds one better than the current node.

## What is the difference between greedy and A * search?

The only difference between Greedy BFS and A* BFS is in the evaluation function. For Greedy BFS the evaluation function is f(n) = h(n) while for A* the evaluation function is f(n) = g(n) + h(n).

## What is the difference between uniform-cost search and best first search?

The difference between Uniform-cost search and Best-first search are as follows- Uniform-cost search is uninformed search whereas Best-first search is informed search. Uniform cost search expands the least cost node but Best-first search expands the least node.

## What’s the difference between greedy search and uniform search?

Greedy Search doesn’t go back up the tree – it picks the lowest value and commits to that. Uniform-Cost will pick the lowest total cost from the entire tree. In a uniform cost search you always consider all unvisited nodes you have seen so far, not just those that are connected to the node you looked at.

## What is the difference between greedy and best-first search?

It seems that “greedy” and “best-first” are often used interchangeably. Even Wikipedia has conflicting definitions… The A* search algorithm is an example of a best-first search algorithm, as is B*. Best-first algorithms are often used for path finding in combinatorial search.

## What’s the difference between a * and greedy best?

A* is also complete (unless there are infinitely many nodes to explore in the search space). The time complexity is O ( b m). However, A* needs to keep all nodes in memory while searching, not just the ones in the fringe, because A*, essentially, performs an “exhaustive search” (which is “informed”, in the sense that it uses a heuristic function).