This document defines algorithms and how to analyze them. It begins by defining an algorithm informally as a tool for solving computational problems and formally in terms of mathematical models of computation. It then discusses analyzing algorithms to determine their performance characteristics like running time. In particular, it focuses on analyzing the time or space complexity of algorithms, usually expressed as functions of the input size. The document provides examples and conventions for analyzing simple algorithms like linear search. It emphasizes analyzing asymptotic worst-case complexity to compare algorithms and determine how efficiently they solve problems even for large inputs.
This document provides an introduction and overview of algorithms and analysis of algorithms. It begins with definitions of algorithms and what constitutes an algorithm. It then discusses analyzing algorithms to determine their efficiency, including analyzing worst-case, average-case, and best-case scenarios. It introduces asymptotic notation used to describe algorithm running times at different scales, including big-O notation. It also discusses computational models and analyzing algorithms in terms of counting the basic operations they perform. The document is presented as a lecture on algorithms with definitions, examples, and outlines of key topics to cover.
The document discusses algorithms and their analysis. It begins by defining an algorithm and listing requirements like being unambiguous and finite. It describes writing algorithms using pseudocode or flowcharts and proving their correctness. The document then discusses analyzing algorithms by measuring their time and space efficiency using orders of growth. It explains analyzing best, worst, and average cases and counting basic operations. Finally, it provides examples of analyzing simple algorithms involving if statements and loops.
The document provides an introduction and overview of the Design and Analysis of Algorithms course. It covers key topics like asymptotic notations and their properties, analyzing recursive and non-recursive algorithms, divide-and-conquer algorithms like quicksort and mergesort, and sorting algorithms like heap sort. Examples of insertion sort and analysis of its worst-case running time of O(n2) are provided. Asymptotic notation like Big-O, Ω, and Θ are introduced to analyze algorithms' time complexities as the problem size n approaches infinity.
CP4151 Advanced data structures and algorithmsSheba41
The document introduces algorithms and their role in computing. It defines algorithms as tools for solving well-specified computational problems. Algorithms must be correct, producing the appropriate output for each input, and efficient, using as little resources as possible. Examples of algorithms provided include sorting a list alphabetically and determining if a number is prime. Pseudo-code is used to describe algorithms in a language-independent way.
This document discusses algorithms and their analysis. It begins with definitions of algorithms and their characteristics. Different methods for specifying algorithms are described, including pseudocode. The goal of algorithm analysis is introduced as comparing algorithms based on running time and other factors. Common algorithm analysis methods like worst-case, best-case, and average-case are defined. Big-O notation and time/space complexity are explained. Common algorithm design strategies like divide-and-conquer and randomized algorithms are summarized. Specific algorithms like repeated element detection and primality testing are mentioned.
The document introduces algorithms and their role in computing. It defines computational problems as relationships between inputs and outputs. Algorithms are tools used to solve well-specified computational problems and must be correct and efficient. Examples of algorithms are given for common problems like determining if a number is prime or sorting a list alphabetically. Key aspects of algorithms like variables, instructions, selection, repetition and documentation are outlined. Examples are provided of analyzing algorithm efficiency based on runtime. Pseudo-code conventions for writing algorithms are also presented.
CP4151 ADSA unit1 Advanced Data Structures and AlgorithmsSheba41
The document introduces algorithms and their role in computing. It defines computational problems as relationships between inputs and outputs. Algorithms are tools used to solve well-specified computational problems and must be correct and efficient. Examples of algorithms are provided, along with their components like variables, instructions, selections, and repetitions. The document also discusses algorithm efficiency and provides examples comparing the efficiencies of different sorting algorithms. Pseudo-code conventions for writing algorithms are also outlined.
This document provides an introduction and overview of algorithms and analysis of algorithms. It begins with definitions of algorithms and what constitutes an algorithm. It then discusses analyzing algorithms to determine their efficiency, including analyzing worst-case, average-case, and best-case scenarios. It introduces asymptotic notation used to describe algorithm running times at different scales, including big-O notation. It also discusses computational models and analyzing algorithms in terms of counting the basic operations they perform. The document is presented as a lecture on algorithms with definitions, examples, and outlines of key topics to cover.
The document discusses algorithms and their analysis. It begins by defining an algorithm and listing requirements like being unambiguous and finite. It describes writing algorithms using pseudocode or flowcharts and proving their correctness. The document then discusses analyzing algorithms by measuring their time and space efficiency using orders of growth. It explains analyzing best, worst, and average cases and counting basic operations. Finally, it provides examples of analyzing simple algorithms involving if statements and loops.
The document provides an introduction and overview of the Design and Analysis of Algorithms course. It covers key topics like asymptotic notations and their properties, analyzing recursive and non-recursive algorithms, divide-and-conquer algorithms like quicksort and mergesort, and sorting algorithms like heap sort. Examples of insertion sort and analysis of its worst-case running time of O(n2) are provided. Asymptotic notation like Big-O, Ω, and Θ are introduced to analyze algorithms' time complexities as the problem size n approaches infinity.
CP4151 Advanced data structures and algorithmsSheba41
The document introduces algorithms and their role in computing. It defines algorithms as tools for solving well-specified computational problems. Algorithms must be correct, producing the appropriate output for each input, and efficient, using as little resources as possible. Examples of algorithms provided include sorting a list alphabetically and determining if a number is prime. Pseudo-code is used to describe algorithms in a language-independent way.
This document discusses algorithms and their analysis. It begins with definitions of algorithms and their characteristics. Different methods for specifying algorithms are described, including pseudocode. The goal of algorithm analysis is introduced as comparing algorithms based on running time and other factors. Common algorithm analysis methods like worst-case, best-case, and average-case are defined. Big-O notation and time/space complexity are explained. Common algorithm design strategies like divide-and-conquer and randomized algorithms are summarized. Specific algorithms like repeated element detection and primality testing are mentioned.
The document introduces algorithms and their role in computing. It defines computational problems as relationships between inputs and outputs. Algorithms are tools used to solve well-specified computational problems and must be correct and efficient. Examples of algorithms are given for common problems like determining if a number is prime or sorting a list alphabetically. Key aspects of algorithms like variables, instructions, selection, repetition and documentation are outlined. Examples are provided of analyzing algorithm efficiency based on runtime. Pseudo-code conventions for writing algorithms are also presented.
CP4151 ADSA unit1 Advanced Data Structures and AlgorithmsSheba41
The document introduces algorithms and their role in computing. It defines computational problems as relationships between inputs and outputs. Algorithms are tools used to solve well-specified computational problems and must be correct and efficient. Examples of algorithms are provided, along with their components like variables, instructions, selections, and repetitions. The document also discusses algorithm efficiency and provides examples comparing the efficiencies of different sorting algorithms. Pseudo-code conventions for writing algorithms are also outlined.
The document discusses stacks and queues as linear data structures. A stack follows LIFO (last in first out) where the last element inserted is the first removed. Common stack operations are push to insert and pop to remove elements. Stacks can be implemented using arrays or linked lists. A queue follows FIFO (first in first out) where the first element inserted is the first removed. Common queue operations are enqueue to insert and dequeue to remove elements. Queues can also be implemented using arrays or linked lists. Circular queues and priority queues are also introduced.
The document discusses stacks and queues as linear data structures. A stack follows LIFO (last in first out) where the last element inserted is the first to be removed. Common stack operations are push to add an element and pop to remove an element. Stacks can be implemented using arrays or linked lists. A queue follows FIFO (first in first out) where the first element inserted is the first to be removed. Common queue operations are enqueue to add an element and dequeue to remove an element. Queues can also be implemented using arrays or linked lists. Circular queues and priority queues are also discussed briefly.
The document discusses fundamentals of analyzing algorithm efficiency, including:
- Measuring an algorithm's time efficiency based on input size and number of basic operations.
- Using asymptotic notations like O, Ω, Θ to classify algorithms by order of growth.
- Analyzing worst-case, best-case, and average-case efficiencies.
- Setting up recurrence relations to analyze recursive algorithms like merge sort.
This document provides an overview of algorithm analysis and asymptotic complexity. It discusses learning outcomes related to analyzing algorithm efficiency using Big O, Omega, and Theta notation. Key points covered include:
- Defining the problem size n and relating algorithm running time to n
- Distinguishing between best-case, worst-case, and average-case complexity
- Using asymptotic notation like Big O to give upper bounds on complexity rather than precise calculations
- Common asymptotic categories like O(n), O(n^2), O(n log n) that classify algorithm growth rates
The document discusses algorithms, data abstraction, asymptotic analysis, arrays, polynomials, and sparse matrices. It defines algorithms and discusses their advantages and disadvantages. It explains how to design an algorithm and describes iterative and recursive algorithms. It defines data abstraction and gives an example using smartphones. It discusses time and space complexity analysis and different asymptotic notations like Big O, Omega, and Theta. It describes what arrays are, different types of arrays, and applications of arrays. It explains how to represent and add polynomials using linked lists. Finally, it defines sparse matrices and two methods to represent them using arrays and linked lists.
This document provides an overview of the CS303 Computer Algorithms course taught by Dr. Yanxia Jia. It discusses the importance of algorithms, provides examples of classic algorithm problems like sorting and searching, and summarizes common algorithm design techniques and data structures used, including arrays, linked lists, stacks, queues, heaps, graphs and trees.
This slides contains assymptotic notations, recurrence relation like subtitution method, iteration method, master method and recursion tree method and sorting algorithms like merge sort, quick sort, heap sort, counting sort, radix sort and bucket sort.
The document discusses analyzing algorithms by predicting their resource requirements, such as time complexity. It introduces the random-access machine (RAM) model for analyzing algorithms, which assumes basic instructions like arithmetic, data movement, and control take constant time. The document then analyzes the time complexity of insertion sort, finding its best-case running time is linear but its worst-case running time is quadratic, making worst-case analysis most important.
The document discusses algorithms and their analysis. It defines an algorithm as a step-by-step procedure to solve a problem and get a desired output. Key aspects of algorithms discussed include their time and space complexity, asymptotic analysis to determine best, average, and worst case running times, and common asymptotic notations like Big O that are used to analyze algorithms. Examples are provided to demonstrate how to determine the time and space complexity of different algorithms like those using loops, recursion, and nested loops.
Design & Analysis of Algorithm course .pptxJeevaMCSEKIOT
This document discusses algorithms and their analysis. It defines an algorithm as a well-defined computational procedure that takes inputs and produces outputs. Key characteristics of algorithms include definiteness, finiteness, effectiveness, correctness, simplicity, and unambiguousness. The document discusses two common algorithm design techniques: divide and conquer, which divides a problem into subproblems, and greedy techniques, which make locally optimal choices to find a near-optimal solution. It also covers analyzing algorithms, including asymptotic time and space complexity analysis to determine how resource usage grows with problem size.
The document discusses algorithms and data structures. It defines an algorithm as a well-defined procedure that takes input and produces output. Algorithms are used for calculation, data processing, and automated reasoning. The document discusses different ways of describing algorithms including natural language, flowcharts, and pseudo code. It also discusses analyzing the time complexity of algorithms using asymptotic notation such as Big-O, Omega, and Theta notation. Recursive algorithms and solving recurrences are also covered.
TIME EXECUTION OF DIFFERENT SORTED ALGORITHMSTanya Makkar
what is Algorithm and classification and its complexity
Time Complexity
Time Space trade-off
Asymptotic time complexity of algorithm and its notation
Why do we need to classify running time of algorithm into growth rates?
Big O-h notation and example
Big omega notation and example
Big theta notation and its example
best among the 3 notation
finding complexity f(n) for certain cases
1. Average case
2.Best case
3.Worst case
Searching
Sorting
complexity of Sorting
Conclusion
Performance analysis is important for algorithms and software features. Asymptotic analysis evaluates how an algorithm's time or space requirements grow with increasing input size, ignoring constants and machine-specific factors. This allows algorithms to be analyzed and compared regardless of machine or small inputs. The document discusses common time complexities like O(1), O(n), O(n log n), and analyzing worst, average, and best cases. It also covers techniques like recursion, amortized analysis, and the master method for solving algorithm recurrences.
/
p
This document provides an overview of the CS-2251 DESIGN AND ANALYSIS OF ALGORITHMS course. It defines algorithms and discusses algorithm design and analysis processes. It covers different algorithm efficiency measures, specification methods, important problem types, classification techniques, and examples like the Euclid algorithm. Key aspects of sorting, searching, graph, combinatorial, and numerical problems are outlined. The features of efficient algorithms and orders of algorithms are defined.
tt
h
Brief introduction to Algorithm analysis Anantha Ramu
Slide explains concepts
1. What is Asymptotic analysis
2. Why do we need it
3. Examples of Notation
4. What are the various kinds of Asymptotic analysis
5. How to compute Big O Notation
6. Big Oh examples
This document discusses algorithm analysis and complexity. It introduces algorithm analysis as a way to predict and compare algorithm performance. Different algorithms for computing factorials and finding the maximum subsequence sum are presented, along with their time complexities. The importance of efficient algorithms for problems involving large datasets is discussed.
This document discusses complexity analysis of algorithms. It defines an algorithm and lists properties like being correct, unambiguous, terminating, and simple. It describes common algorithm design techniques like divide and conquer, dynamic programming, greedy method, and backtracking. It compares divide and conquer with dynamic programming. It discusses algorithm analysis in terms of time and space complexity to predict resource usage and compare algorithms. It introduces asymptotic notations like Big-O notation to describe upper bounds of algorithms as input size increases.
These lecture notes cover algorithms and their analysis over 4 modules. Module I introduces algorithms, their properties, analysis of complexity and asymptotic notations. It covers analysis of sorting algorithms like merge sort, quicksort and binary search. Module II covers dynamic programming and greedy algorithms. Module III covers graph algorithms like BFS, DFS and minimum spanning trees. Module IV covers advanced topics like fast Fourier transform, string matching, NP-completeness and approximation algorithms.
These lecture notes cover the design and analysis of algorithms over 4 modules. Module I introduces algorithms, their characteristics, expectations and analysis. It discusses asymptotic analysis using big O, Ω and Θ notations to analyze the growth of algorithms like insertion sort, which has a worst case running time of Θ(n2). Subsequent modules cover dynamic programming, greedy algorithms, graphs, and NP-completeness. The notes provide an overview of key algorithm design and analysis topics.
Design & Analysis of Algorithms Lecture NotesFellowBuddy.com
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# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
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Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
The document discusses stacks and queues as linear data structures. A stack follows LIFO (last in first out) where the last element inserted is the first removed. Common stack operations are push to insert and pop to remove elements. Stacks can be implemented using arrays or linked lists. A queue follows FIFO (first in first out) where the first element inserted is the first removed. Common queue operations are enqueue to insert and dequeue to remove elements. Queues can also be implemented using arrays or linked lists. Circular queues and priority queues are also introduced.
The document discusses stacks and queues as linear data structures. A stack follows LIFO (last in first out) where the last element inserted is the first to be removed. Common stack operations are push to add an element and pop to remove an element. Stacks can be implemented using arrays or linked lists. A queue follows FIFO (first in first out) where the first element inserted is the first to be removed. Common queue operations are enqueue to add an element and dequeue to remove an element. Queues can also be implemented using arrays or linked lists. Circular queues and priority queues are also discussed briefly.
The document discusses fundamentals of analyzing algorithm efficiency, including:
- Measuring an algorithm's time efficiency based on input size and number of basic operations.
- Using asymptotic notations like O, Ω, Θ to classify algorithms by order of growth.
- Analyzing worst-case, best-case, and average-case efficiencies.
- Setting up recurrence relations to analyze recursive algorithms like merge sort.
This document provides an overview of algorithm analysis and asymptotic complexity. It discusses learning outcomes related to analyzing algorithm efficiency using Big O, Omega, and Theta notation. Key points covered include:
- Defining the problem size n and relating algorithm running time to n
- Distinguishing between best-case, worst-case, and average-case complexity
- Using asymptotic notation like Big O to give upper bounds on complexity rather than precise calculations
- Common asymptotic categories like O(n), O(n^2), O(n log n) that classify algorithm growth rates
The document discusses algorithms, data abstraction, asymptotic analysis, arrays, polynomials, and sparse matrices. It defines algorithms and discusses their advantages and disadvantages. It explains how to design an algorithm and describes iterative and recursive algorithms. It defines data abstraction and gives an example using smartphones. It discusses time and space complexity analysis and different asymptotic notations like Big O, Omega, and Theta. It describes what arrays are, different types of arrays, and applications of arrays. It explains how to represent and add polynomials using linked lists. Finally, it defines sparse matrices and two methods to represent them using arrays and linked lists.
This document provides an overview of the CS303 Computer Algorithms course taught by Dr. Yanxia Jia. It discusses the importance of algorithms, provides examples of classic algorithm problems like sorting and searching, and summarizes common algorithm design techniques and data structures used, including arrays, linked lists, stacks, queues, heaps, graphs and trees.
This slides contains assymptotic notations, recurrence relation like subtitution method, iteration method, master method and recursion tree method and sorting algorithms like merge sort, quick sort, heap sort, counting sort, radix sort and bucket sort.
The document discusses analyzing algorithms by predicting their resource requirements, such as time complexity. It introduces the random-access machine (RAM) model for analyzing algorithms, which assumes basic instructions like arithmetic, data movement, and control take constant time. The document then analyzes the time complexity of insertion sort, finding its best-case running time is linear but its worst-case running time is quadratic, making worst-case analysis most important.
The document discusses algorithms and their analysis. It defines an algorithm as a step-by-step procedure to solve a problem and get a desired output. Key aspects of algorithms discussed include their time and space complexity, asymptotic analysis to determine best, average, and worst case running times, and common asymptotic notations like Big O that are used to analyze algorithms. Examples are provided to demonstrate how to determine the time and space complexity of different algorithms like those using loops, recursion, and nested loops.
Design & Analysis of Algorithm course .pptxJeevaMCSEKIOT
This document discusses algorithms and their analysis. It defines an algorithm as a well-defined computational procedure that takes inputs and produces outputs. Key characteristics of algorithms include definiteness, finiteness, effectiveness, correctness, simplicity, and unambiguousness. The document discusses two common algorithm design techniques: divide and conquer, which divides a problem into subproblems, and greedy techniques, which make locally optimal choices to find a near-optimal solution. It also covers analyzing algorithms, including asymptotic time and space complexity analysis to determine how resource usage grows with problem size.
The document discusses algorithms and data structures. It defines an algorithm as a well-defined procedure that takes input and produces output. Algorithms are used for calculation, data processing, and automated reasoning. The document discusses different ways of describing algorithms including natural language, flowcharts, and pseudo code. It also discusses analyzing the time complexity of algorithms using asymptotic notation such as Big-O, Omega, and Theta notation. Recursive algorithms and solving recurrences are also covered.
TIME EXECUTION OF DIFFERENT SORTED ALGORITHMSTanya Makkar
what is Algorithm and classification and its complexity
Time Complexity
Time Space trade-off
Asymptotic time complexity of algorithm and its notation
Why do we need to classify running time of algorithm into growth rates?
Big O-h notation and example
Big omega notation and example
Big theta notation and its example
best among the 3 notation
finding complexity f(n) for certain cases
1. Average case
2.Best case
3.Worst case
Searching
Sorting
complexity of Sorting
Conclusion
Performance analysis is important for algorithms and software features. Asymptotic analysis evaluates how an algorithm's time or space requirements grow with increasing input size, ignoring constants and machine-specific factors. This allows algorithms to be analyzed and compared regardless of machine or small inputs. The document discusses common time complexities like O(1), O(n), O(n log n), and analyzing worst, average, and best cases. It also covers techniques like recursion, amortized analysis, and the master method for solving algorithm recurrences.
/
p
This document provides an overview of the CS-2251 DESIGN AND ANALYSIS OF ALGORITHMS course. It defines algorithms and discusses algorithm design and analysis processes. It covers different algorithm efficiency measures, specification methods, important problem types, classification techniques, and examples like the Euclid algorithm. Key aspects of sorting, searching, graph, combinatorial, and numerical problems are outlined. The features of efficient algorithms and orders of algorithms are defined.
tt
h
Brief introduction to Algorithm analysis Anantha Ramu
Slide explains concepts
1. What is Asymptotic analysis
2. Why do we need it
3. Examples of Notation
4. What are the various kinds of Asymptotic analysis
5. How to compute Big O Notation
6. Big Oh examples
This document discusses algorithm analysis and complexity. It introduces algorithm analysis as a way to predict and compare algorithm performance. Different algorithms for computing factorials and finding the maximum subsequence sum are presented, along with their time complexities. The importance of efficient algorithms for problems involving large datasets is discussed.
This document discusses complexity analysis of algorithms. It defines an algorithm and lists properties like being correct, unambiguous, terminating, and simple. It describes common algorithm design techniques like divide and conquer, dynamic programming, greedy method, and backtracking. It compares divide and conquer with dynamic programming. It discusses algorithm analysis in terms of time and space complexity to predict resource usage and compare algorithms. It introduces asymptotic notations like Big-O notation to describe upper bounds of algorithms as input size increases.
These lecture notes cover algorithms and their analysis over 4 modules. Module I introduces algorithms, their properties, analysis of complexity and asymptotic notations. It covers analysis of sorting algorithms like merge sort, quicksort and binary search. Module II covers dynamic programming and greedy algorithms. Module III covers graph algorithms like BFS, DFS and minimum spanning trees. Module IV covers advanced topics like fast Fourier transform, string matching, NP-completeness and approximation algorithms.
These lecture notes cover the design and analysis of algorithms over 4 modules. Module I introduces algorithms, their characteristics, expectations and analysis. It discusses asymptotic analysis using big O, Ω and Θ notations to analyze the growth of algorithms like insertion sort, which has a worst case running time of Θ(n2). Subsequent modules cover dynamic programming, greedy algorithms, graphs, and NP-completeness. The notes provide an overview of key algorithm design and analysis topics.
Design & Analysis of Algorithms Lecture NotesFellowBuddy.com
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.”
Like Us - https://www.facebook.com/FellowBuddycom
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
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Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
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"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
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Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
1. What is an Algorithm?
(And how do we analyze one?)
COMP 550, Fall 2019
2. Intro - 2 Comp 122,
Algorithms
Informally,
A tool for solving a well-specified computational
problem.
Example: sorting
input: A sequence of numbers.
output: An ordered permutation of the input.
issues: correctness, efficiency, storage, etc.
Algorithm
Input Output
3. Intro - 3 Comp 122,
Strengthening the Informal Definiton
An algorithm is a finite sequence of
unambiguous instructions for solving a well-
specified computational problem.
Important Features:
Finiteness.
Definiteness.
Input.
Output.
Effectiveness.
4. Intro - 4 Comp 122,
Algorithm – In Formal Terms…
In terms of mathematical models of computational
platforms (general-purpose computers).
One definition – Turing Machine that always halts.
Other definitions are possible (e.g. Lambda Calculus.)
Mathematical basis is necessary to answer questions
such as:
Is a problem solvable? (Does an algorithm exist?)
Complexity classes of problems. (Is an efficient algorithm
possible?)
Interested in learning more?
Take COMP 181 and/or David Harel’s book Algorithmics.
5. Intro - 5 Comp 122,
Algorithm Analysis
Determining performance characteristics.
(Predicting the resource requirements.)
Time, memory, communication bandwidth etc.
Computation time (running time) is of primary
concern.
Why analyze algorithms?
Choose the most efficient of several possible
algorithms for the same problem.
Is the best possible running time for a problem
reasonably finite for practical purposes?
Is the algorithm optimal (best in some sense)? – Is
something better possible?
6. Intro - 6 Comp 122,
Running Time
Run time expression should be machine-
independent.
Use a model of computation or “hypothetical”
computer.
Our choice – RAM model (most commonly-used).
Model should be
Simple.
Applicable.
7. Intro - 7 Comp 122,
RAM Model
Generic single-processor model.
Supports simple constant-time instructions found in
real computers.
Arithmetic (+, –, *, /, %, floor, ceiling).
Data Movement (load, store, copy).
Control (branch, subroutine call).
Run time (cost) is uniform (1 time unit) for all simple
instructions.
Memory is unlimited.
Flat memory model – no hierarchy.
Access to a word of memory takes 1 time unit.
Sequential execution – no concurrent operations.
8. Intro - 8 Comp 122,
Model of Computation
Should be simple, or even simplistic.
Assign uniform cost for all simple operations and
memory accesses. (Not true in practice.)
Question: Is this OK?
Should be widely applicable.
Can’t assume the model to support complex
operations. Ex: No SORT instruction.
Size of a word of data is finite.
Why?
9. Intro - 9 Comp 122,
Running Time – Definition
Call each simple instruction and access to a
word of memory a “primitive operation” or
“step.”
Running time of an algorithm for a given input
is
The number of steps executed by the algorithm on
that input.
Often referred to as the complexity of the
algorithm.
10. Intro - 10 Comp 122,
Complexity and Input
Complexity of an algorithm generally depends
on
Size of input.
• Input size depends on the problem.
– Examples: No. of items to be sorted.
– No. of vertices and edges in a graph.
Other characteristics of the input data.
• Are the items already sorted?
• Are there cycles in the graph?
11. Intro - 11 Comp 122,
Worst, Average, and Best-case Complexity
Worst-case Complexity
Maximum steps the algorithm takes for any
possible input.
Most tractable measure.
Average-case Complexity
Average of the running times of all possible inputs.
Demands a definition of probability of each input,
which is usually difficult to provide and to analyze.
Best-case Complexity
Minimum number of steps for any possible input.
Not a useful measure. Why?
12. Intro - 12 Comp 122,
Pseudo-code Conventions
Read about pseudo-code in the text. pp 19 – 20.
Indentation (for block structure).
Value of loop counter variable upon loop termination.
Conventions for compound data. Differs from syntax in
common programming languages.
Call by value not reference.
Local variables.
Error handling is omitted.
Concerns of software engineering ignored.
…
13. Intro - 13 Comp 122,
A Simple Example – Linear Search
INPUT: a sequence of n numbers, key to search for.
OUTPUT: true if key occurs in the sequence, false otherwise.
n
i 2
1
LinearSearch(A, key) cost times
1 i 1 c1 1
2 while i ≤ n and A[i] != key c2 x
3 do i++ c3 x-1
4 if i n c4 1
5 then return true c5 1
6 else return false c6 1
x ranges between 1 and n+1.
So, the running time ranges between
c1+ c2+ c4 + c5 – best case
and
c1+ c2(n+1)+ c3n + c4 + c6 – worst case
14. Intro - 14 Comp 122,
A Simple Example – Linear Search
INPUT: a sequence of n numbers, key to search for.
OUTPUT: true if key occurs in the sequence, false otherwise.
n
i 2
1
Assign a cost of 1 to all statement executions.
Now, the running time ranges between
1+ 1+ 1 + 1 = 4 – best case
and
1+ (n+1)+ n + 1 + 1 = 2n+4 – worst case
LinearSearch(A, key) cost times
1 i 1 1 1
2 while i ≤ n and A[i] != key 1 x
3 do i++ 1 x-1
4 if i n 1 1
5 then return true 1 1
6 else return false 1 1
15. Intro - 15 Comp 122,
A Simple Example – Linear Search
INPUT: a sequence of n numbers, key to search for.
OUTPUT: true if key occurs in the sequence, false otherwise.
n
i 2
1
If we assume that we search for a random item in the list,
on an average, Statements 2 and 3 will be executed n/2 times.
Running times of other statements are independent of input.
Hence, average-case complexity is
1+ n/2+ n/2 + 1 + 1 = n+3
LinearSearch(A, key) cost times
1 i 1 1 1
2 while i ≤ n and A[i] != key 1 x
3 do i++ 1 x-1
4 if i n 1 1
5 then return true 1 1
6 else return false 1 1
16. Intro - 16 Comp 122,
Order of growth
Principal interest is to determine
how running time grows with input size – Order of growth.
the running time for large inputs – Asymptotic complexity.
In determining the above,
Lower-order terms and coefficient of the highest-order term are
insignificant.
Ex: In 7n5+6n3+n+10, which term dominates the running time for
very large n?
Complexity of an algorithm is denoted by the highest-order term
in the expression for running time.
Ex: Ο(n), Θ(1), Ω(n2), etc.
Constant complexity when running time is independent of the input size –
denoted Ο(1).
Linear Search: Best case Θ(1), Worst and Average cases: Θ(n).
More on Ο, Θ, and Ω in next class. Use Θ for the present.
17. Intro - 17 Comp 122,
Comparison of Algorithms
Complexity function can be used to compare the
performance of algorithms.
Algorithm A is more efficient than Algorithm B
for solving a problem, if the complexity
function of A is of lower order than that of B.
Examples:
Linear Search – (n) vs. Binary Search – (lg n)
Insertion Sort – (n2) vs. Quick Sort – (n lg n)
18. Intro - 18 Comp 122,
Comparisons of Algorithms
Multiplication
classical technique: O(nm)
divide-and-conquer: O(nmln1.5) ~ O(nm0.59)
For operands of size 1000, takes 40 & 15 seconds
respectively on a Cyber 835.
Sorting
insertion sort: (n2)
merge sort: (n lg n)
For 106 numbers, it took 5.56 hrs on a
supercomputer using machine language and 16.67
min on a PC using C/C++.
19. Intro - 19 Comp 122,
Why Order of Growth Matters?
Computer speeds double every two years,
so why worry about algorithm speed?
When speed doubles, what happens to the
amount of work you can do?
What about the demands of applications?
20. Intro - 20 Comp 122,
Effect of Faster Machines
• Higher gain with faster hardware for more efficient algorithm.
• Results are more dramatic for more higher speeds.
No. of items sorted
Ο(n2)
H/W Speed
Comp. of Alg.
1 M*
2 M Gain
1000 1414 1.414
O(n lgn) 62700 118600 1.9
* Million operations per second.
21. Intro - 21 Comp 122,
Correctness Proofs
Proving (beyond “any” doubt) that an
algorithm is correct.
Prove that the algorithm produces correct output
when it terminates. Partial Correctness.
Prove that the algorithm will necessarily terminate.
Total Correctness.
Techniques
Proof by Construction.
Proof by Induction.
Proof by Contradiction.
22. Intro - 22 Comp 122,
Loop Invariant
Logical expression with the following properties.
Holds true before the first iteration of the loop –
Initialization.
If it is true before an iteration of the loop, it remains true
before the next iteration – Maintenance.
When the loop terminates, the invariant ― along with the
fact that the loop terminated ― gives a useful property that
helps show that the loop is correct – Termination.
Similar to mathematical induction.
Are there differences?
23. Intro - 23 Comp 122,
Correctness Proof of Linear Search
Use Loop Invariant for the while loop:
At the start of each iteration of the while loop, the
search key is not in the subarray A[1..i-1].
LinearSearch(A, key)
1 i 1
2 while i ≤ n and A[i] != key
3 do i++
4 if i n
5 then return true
6 else return false
If the algm. terminates,
then it produces correct
result.
Initialization.
Maintenance.
Termination.
Argue that it terminates.
24. Intro - 24 Comp 122,
Go through correctness proof of insertion sort in
the text.