Stack Overflow
Stack Overflow

Questions tagged [uniform-cost-search]

UCS is a simple version of the best-first search scheme which is logically equivalent to Dijkstra's algorithm

In some fields, artificial intelligence in particular, Dijkstra's algorithm or a variant of it is known as uniform cost search (ucs) and formulated as an instance of the more general idea of best-first search. Sources:
1. Wikipedia
2. Dijkstra’s Algorithm versus Uniform Cost Search

14 questions
18
votes
5 answers

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

Both methods have a data structure which holds the nodes (with their cost) to expand. Both methods first expand the node with the best cost. So, what is the difference between them? I was told that uniform-cost search is a blind method and…
T.Poe
  • 1,949
  • 6
  • 28
  • 59
2
votes
0 answers

How to create an algorithm from pseudo code to uniform cost search?

As we know from daily experience diagonal moves are cheaper than a horizontal + vertical moves, this becomes a problem of uneven step cost. So, uniform cost search will be required to solve this problem. To implement uniform cost search, you will…
t311337
  • 21
  • 1
2
votes
0 answers

Neo4j 3.5 Java embedded. How to increase heap size?

When using Neo4j embedded with Java how do I increase the size of the heap past 2 gigabytes? I tried to increase it to 4 Gigabytes using GraphDatabaseService graphDb = new GraphDatabaseFactory() .newEmbeddedDatabaseBuilder(new…
Guy Coder
  • 24,501
  • 8
  • 71
  • 136
1
vote
0 answers

Search algorithms for route finding in a graph

I am trying to implement DFS, BFS and UCS (uniform cost search) to find routes between different train stations using this CSV file. If you open the data file with any text editor, you will see the content of the file as: "Harrow & Wealdstone",…
Mughees Asif
  • 83
  • 6
1
vote
1 answer

Uniform cost search

For a uniform cost search, would C expand D first as is the cheapest or G because is the goal? The rule is normally that uniform cost search would expand the cheapest node, however G is the goal and also totally it would be the lowest cost? Can you…
Andreea Mitel
  • 63
  • 7
1
vote
1 answer

How to convert this BFS code to DFS and UCS using stack implementation..?

This is a BFS code using Queue G1:vertex from collections import deque and I want to implement DFS and UCS code from this BFS code using stack instead of queue. Please help me with this code. graph={ 'a': set(['b','c']), 'b':…
Sheikh Muhammad Umar
  • 46
  • 5
0
votes
1 answer

UCS algorithm iteration

I've been trying to implement UCS and for that I thought it will be best if I first did hand sketch of how it work other than going through code. I got a graph I tried implementing the UCS(Uniform cost Search) in the above graph. But I got confused…
Muhammad Uzair Kabeer
  • 11
  • 3
0
votes
0 answers

Uniform search cost: How should I change?

I'm having difficulty implementing UCS in python. I don't know where I get missed the code. def UCS(N, w, start, goal): visited = [] frontier = [(0, start)] explored = set() while frontier: cost, node = heapq.heappop(frontier) …
terry
  • 1
  • 2
0
votes
1 answer

When we do uniform cost search, do we need to know where the destination or goal state is?

Since uniform cost search is belong to uninform/ blind search algorithm we have no heuristic details. But when we do uniform cost search we have to reach the goal state within the lowest cost path. For that we need to know where the goal node is?…
B.A Thisara dilshan
  • 1
0
votes
0 answers

Printing the path in constrained shortest path problem (uniform cost search)

Suppose we are given a graph with a predefined source node (S) and a target node (T). Each edge in the graph is associated with a pair of values (X, Y) where X denotes the distance and Y denotes the energy cost. See image for illustration: Example…
pkl
  • 1
  • 2
0
votes
1 answer

How to find shortest path in prolog with weighted graph

I have this code : link(a,b,4). link(a,c,2). link(b,g,5). link(c,g,6). link(c,d,5). link(d,g,3). path(S,D,TDist):- link(S,D,TDist). path(S,D,TDist):- link(S,X,TD1), path(X,D,TD2), TDist=TD1+TD2. This will follow a depth first…
John Sall
  • 1,027
  • 1
  • 12
  • 25
-1
votes
2 answers

Having AttribueError

I'm trying to implement a uniform cost search algorithm using node-edge-graph structure. And these are my classes class Node: def __init__(self, name: str, edges:list = [] ) -> None: self.name = name self.edges = edges class…
kamilcoban
  • 3
  • 3
-1
votes
1 answer

Uniform Cost Search (TypeError: 'Graph' object is not subscriptable)

I am implementing Uniform Cost Search function in python but when I try to run my code then there's an error displaying "TypeError: 'Graph' object is not subscriptable". Here's my code below. I have imported Queue and Graph into my main function. I…
ThatGuy
  • 1
  • 1