Hill climbing is a local search algorithm that starts with a random solution and iteratively makes small changes to improve the solution. It terminates when no further improvements can be made. Hill climbing can get stuck at local optima rather than finding the global optimum. Simulated annealing is similar to hill climbing but allows occasional "downhill moves" that worsen the solution based on a probability function involving the change in solution quality and temperature parameter. The temperature is gradually decreased, reducing the probability of downhill moves over time. This helps simulated annealing avoid local optima and find better solutions than hill climbing.
I. Hill climbing algorithm II. Steepest hill climbing algorithmvikas dhakane
Artificial Intelligence: Introduction, Typical Applications. State Space Search: Depth Bounded
DFS, Depth First Iterative Deepening. Heuristic Search: Heuristic Functions, Best First Search,
Hill Climbing, Variable Neighborhood Descent, Beam Search, Tabu Search. Optimal Search: A
*
algorithm, Iterative Deepening A*
, Recursive Best First Search, Pruning the CLOSED and OPEN
Lists
ME-314 Introduction to Control Engineering is a course taught to Mechanical Engineering senior undergrads. The course is taught by Dr. Bilal Siddiqui at DHA Suffa University. This lecture is about basic rules of sketching root locus.
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I. Hill climbing algorithm II. Steepest hill climbing algorithmvikas dhakane
Artificial Intelligence: Introduction, Typical Applications. State Space Search: Depth Bounded
DFS, Depth First Iterative Deepening. Heuristic Search: Heuristic Functions, Best First Search,
Hill Climbing, Variable Neighborhood Descent, Beam Search, Tabu Search. Optimal Search: A
*
algorithm, Iterative Deepening A*
, Recursive Best First Search, Pruning the CLOSED and OPEN
Lists
ME-314 Introduction to Control Engineering is a course taught to Mechanical Engineering senior undergrads. The course is taught by Dr. Bilal Siddiqui at DHA Suffa University. This lecture is about basic rules of sketching root locus.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
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this is ppt on the topic of heuristic search techniques or we can also known it by the name of informed search techniques.
in this presentation we only disscuss about three search techniques there are lot of them by the most important once are in this presentation.
Secant method is mathematical Root finding method. Most of techniques like this method but it is useful and time managing strategy.
So, refer this method its is useful for root finding.
this is ppt on the topic of heuristic search techniques or we can also known it by the name of informed search techniques.
in this presentation we only disscuss about three search techniques there are lot of them by the most important once are in this presentation.
Secant method is mathematical Root finding method. Most of techniques like this method but it is useful and time managing strategy.
So, refer this method its is useful for root finding.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
2. Hill Climbing
• Back – Tracking
• Use Enqued List
• Informed Search
• Very similar to DFS except instead of using
lexical order to break ties, it break ties
according to which node is closer to the goal.
• Hill Climbing: Front Sorted
3. Hill Climbing
• It starts with random (potentially poor)
solution, and iteratively makes small changes
to the solution, each time improving it a little.
When the algorithm cannot see any
improvement anymore, it terminates.
• Ideally, at that point the current solution is
close to optimal, but it is not guaranteed that
hill climbing will ever come close to the
optimal solution.
4. Hill Climbing
• Hill climbing can be applied to the travelling
salesman problem.
• It is easy to find a solution that visits all the
cities but will be very poor compared to the
optimal solution.
5. Hill Climbing
The hill climbing can be described as follows:
1. Start with current-state = initial state
2. Until current-state = goal-state OR there is no
change in current-state do:
– Get the successors of the current state and use the
evaluating function to assign a score to each
successor.
– If one of the successors has a better score than the
current-state then set the new current-state to be the
successor with the best score.
• Hill climbing terminates when there are no
successors of the current state which are better
than the current state itself.
6. Hill Climbing
• Hill climbing is depth-first search with a
heuristic measurement that orders choices as
nodes are expanded. It always selects the
most promising successor of the node last
expanded.
7. Hill Climbing
• For instance, consider that the most
promising successor of a node is the one
that has the shortest straight-line
distance to the goal node G.
• In figure below, the straight line
distances between each city and goal G
is indicated in square brackets, i.e. the
heuristic.
8. Hill Climbing
• Problems with Hill Climbing
– Gets stuck at local maxima when we reach a
position where there are no better neighbors, it is
not a guarantee that we have found the best
solution. Ridge is a sequence of local maxima.
– Another type of problem we may find with hill
climbing searches is finding a plateau. This is an
area where the search space is flat so that all
neighbors returns the same evaluation.
9. Hill Climbing
S
A
A
G
E
FB
88.5
8.5 6
6 3
D
The hill climbing search from S to G proceeds as
follows:
S
A
D
B
E
C
F
G
3
4 4
5 5
42
4
3
[8]
[8.5] [6]
[6] [3]
[3]
[10]
10. Hill Climbing
• Apply the hill climbing algorithm to find a path
from S to G, considering that the most promising
successor of a node is its closest neighbor.
S
A
D
B
E
C
F
G
3
4 4
5 5
42
4
3
11. Hill Climbing
•the best first search method selects for expansion the
most promising leaf node of the current search tree
•the hill climbing search method selects for expansion the most
promising successor of the node last expanded.
• In depth-first search: front of the queue (a stack).
• In breadth-first search: back of the queue.
• Now, in hill-climbing search, you sort[1] the current node's
children before adding them to the queue.
• In best-first search, you add the current node's children to
the queue in any order, then sort[1] the entire queue.
• [1]: sort according to some problem-specific evaluation of the
solution node, for example "distance from destination" in a
path-finding search
12. Hill Climbing
AI, Subash Chandra Pakhrin 12
S
G
D
E
B
A
C
5
4
4
6
3
5
7+
6
7+
S
A B
G
A C
D
7+ 6
5
7+
7+ 3
A and C are both equally far from goal, so now we are going to use
lexical order to break the tie
14. Annealing
• In metallurgy, annealing is the process used to
temper or harden metals and glass by heating
them to a high temperature and then
gradually cooling them, thus allowing material
to reach a low energy crystalline state.
• This can be applied to computer science
problems.
15. Simulated Annealing
• It is applied to solve problems like
– Travelling salesman problem
– Designing printed circuit boards
– Solving VLSI layout problems
– Factory scheduling
– Large-scale optimization task
– Planning of path for a robot
– Bioinformatics to design three dimension
structures of protein molecules.
16. Simulated Annealing
• A hill climbing algorithm that never makes “down
hill” moves towards states with lower value is
guaranteed to be incomplete, because it can get
stuck on a local maximum.
• In contrast, a purely random walk – that is,
moving to a successor chosen uniformly at
random from the set of successors- is complete
but extremely inefficient.
• Simulated Annealing = hill climbing + random
walk hence, it is efficient as well as completeness.
17. Simulated Annealing
• At the beginning you don’t care if you are
actually moving towards the good solution
and you accept bad moves as well, you accept
bad configurations as well but as you progress
towards the solution we become more careful
and we try to get closer to the solution by
selecting only the good moves.
18. Simulated Annealing
• Switch the perspective from hill climbing to gradient
descent.
• Imagine the task of getting a ping-pong ball into he
deepest crevice in a bumpy surface.
• If we just let the ball roll, it will get come to rest at a
local minimum.
• If we shake the surface, we can bounce the ball out of
local minimum.
• The trick is to shake just hard enough to bounce the
ball out of local minimum but not hard enough to
dislodge it from the global minimum.
• Simulated Annealing solution is to start by shaking hard
(i.e., at a high temperature) and then gradually reduce
the intensity of shaking (i.e., lower the temperature)
19. Simulated Annealing
• E = Energy of the system
• ΔE = Change in energy
• We need to have a mechanism to alter the
configuration
All possible configurations of a given system
E
n
e
r
g
y
C N
Move
20. Simulated Annealing
C = C init
for T = T max to T min
E c = E(C)
N = next (C)
EN = E(N)
ΔE = EN – EC
If (ΔE > 0)
C = N
else if (eΔE/T > rand (0, 1))
C = N
epoch
21. Simulated Annealing
• If the change in energy is negative, or in other
words if we are making bad move.
– In this case we compute probability
• If probability is very high then we accept the move
even if it is a bad move.
• If probability is very low then we have low probability
to accept the bad move.
• Probability depends upon two variables
change in energy ΔE and the temperature
factor T.
22. Simulated Annealing
• When temperature is very high then
probability for accepting bad move is very
high. In other words, at high temperature we
are exploring the solution space or we are
exploiting the configuration and we’re
accepting bad moves as well.
• When the temperature is low this probability
becomes very low and we have very low
probability to accept bad moves.
23. Simulated Annealing
• Case 1: T = 1000, ΔE = 10
ΔE/T = 0.01
eΔ E/T = 0.99004
A number that is close to one has a very high
(correlation) probability to become greater than a
random number between 0 and 1, which means
we get a very high probability, so when
temperature is very high we have high probability
to accept bad moves as well.
24. Simulated Annealing
ΔE influences probability
• ΔE is very high = a low probability to accept the
move
• ΔE is small = high probability to accept the move.
• We repeat the process for certain number of
times usually known as the number of epochs,
usually 100 to 200 times and for every value of
temperature we repeat the process and finally
expecting the solution to converge towards the
global minimum.
25. Simulated Annealing
• Now on either extremes are 2 other algorithms
1. Hill Climbing
2. Random Walk
• If we remove the probability factor or the
temperature factor and always accept the good
moves only then that’s hill climbing or it’s like a
greedy algorithm which always go towards a
better solution. Such, algorithms are prone to be
easily stuck in local minima.
26. Simulated Annealing
• Random walk: It doesn’t care about how good
a move we are making every time but we just
explore, continue to explore, the space. Such
algorithm never converge and will probably
never give you the best optimal solution.
27. Simulated Annealing
• Parameters T max to T min and number of epochs
are dependent on the problem that we are
solving, usually we start with high temperature
like few thousands, let’s say 5000 or 3000 and
then the minimum temperature is set to a small
value like 0 or 10 or something like that.
• Number of epoch is usually a hundred, or 200
depending on the problem
• If you run multiple times you will have an idea
whether you’re being stuck in the local minima or
global minimum
Editor's Notes
Energy Landscape
Case 1: ΔE = -10000 keeping T constant
e^(-10000) = 0
Case 2: : ΔE = -0.001 keeping T constant
e^(-0.001) = 0.9999