The document discusses technology mapping for area minimization without breaking DAGs into trees. It proposes two approaches - 1) Extending an existing algorithm called Flowmap-r by forming Maximum Fanout Free Cones (MFFCs) for the DAG and 2) A divide and conquer approach that recursively divides the problem into subproblems until reaching leaf nodes. The key steps involve generating MFFCs, finding mappable MFFCs based on a logic library, and using a weighted set cover algorithm to determine the minimum area cover.
This document discusses several graph algorithms:
- Minimum spanning tree algorithms like Prim's and parallel formulations.
- Single-source and all-pairs shortest path algorithms like Dijkstra's and Floyd-Warshall. Parallel formulations are described.
- Other graph algorithms like connected components, transitive closure. Parallel formulations using techniques like merging forests are summarized.
This document discusses dynamic programming and provides examples of serial and parallel formulations for several problems. It introduces classifications for dynamic programming problems based on whether the formulation is serial/non-serial and monadic/polyadic. Examples of serial monadic problems include the shortest path problem and 0/1 knapsack problem. The longest common subsequence problem is an example of a non-serial monadic problem. Floyd's all-pairs shortest path is a serial polyadic problem, while the optimal matrix parenthesization problem is non-serial polyadic. Parallel formulations are provided for several of these examples.
This document discusses various sorting algorithms that can be used on parallel computers. It begins with an overview of sorting and comparison-based sorting algorithms. It then covers sorting networks like bitonic sort, which can sort in parallel using a network of comparators. It discusses how bitonic sort can be mapped to hypercubes and meshes. It also covers parallel implementations of bubble sort variants, quicksort, and shellsort. For each algorithm, it analyzes the parallel runtime and efficiency. The document provides examples and diagrams to illustrate the sorting networks and parallel algorithms.
This document presents an implementation and analysis of parallelizing the training of a multilayer perceptron neural network. It describes distributing the calculations across processor nodes by assigning each processor responsibility for a fraction of nodes in each layer. Theoretical speedups of 1-16x are estimated and experimental speedups of 2-10x are observed for networks with over 60,000 nodes trained on up to 16 processors. Node parallelization provides near linear speedup for training multilayer perceptrons.
- One-to-all broadcast and all-to-one reduction operations can be performed efficiently on networks like rings, meshes, and hypercubes using recursive doubling or similar algorithms.
- All-to-all broadcast, reduction, and personalized communication generalize these operations and can be implemented using similar techniques while accounting for increasing message sizes.
- Operations like all-reduce, prefix-sums, scatter, gather and circular shift can also be implemented efficiently using these basic group communication patterns and algorithms.
The document discusses algorithm analysis and complexity analysis. It introduces big-O notation to classify algorithms based on how their runtime scales with input size. Common complexity classes include constant, logarithmic, linear, quadratic, and exponential time. The document explains how to determine the time complexity of algorithms by analyzing basic operations and ignoring constant factors. Loops are particularly important, as their runtime is determined by the number of iterations.
This document summarizes several algorithms for parallel matrix operations, including matrix-vector multiplication, matrix-matrix multiplication, and solving systems of linear equations via Gaussian elimination. For matrix-vector multiplication, it describes row-wise and column-wise partitioning approaches. For matrix-matrix multiplication, it discusses algorithms based on row/column broadcasting, Cannon's algorithm, and a 3D domain decomposition approach. For Gaussian elimination, it analyzes pipelined and 2D mapping implementations. The key aspects of parallelization, communication costs, computation loads, scalability, and cost efficiency are analyzed for each algorithm.
This document summarizes search algorithms for discrete optimization problems. It begins with an overview of discrete optimization and definitions. It then discusses sequential search algorithms like depth-first search, best-first search, A*, and iterative deepening search. The document next covers parallel search algorithms including parallel depth-first search using dynamic load balancing. It analyzes different load balancing schemes and evaluates them through experiments on satisfiability problems. Finally, it discusses techniques for termination detection in parallel search algorithms.
This document discusses several graph algorithms:
- Minimum spanning tree algorithms like Prim's and parallel formulations.
- Single-source and all-pairs shortest path algorithms like Dijkstra's and Floyd-Warshall. Parallel formulations are described.
- Other graph algorithms like connected components, transitive closure. Parallel formulations using techniques like merging forests are summarized.
This document discusses dynamic programming and provides examples of serial and parallel formulations for several problems. It introduces classifications for dynamic programming problems based on whether the formulation is serial/non-serial and monadic/polyadic. Examples of serial monadic problems include the shortest path problem and 0/1 knapsack problem. The longest common subsequence problem is an example of a non-serial monadic problem. Floyd's all-pairs shortest path is a serial polyadic problem, while the optimal matrix parenthesization problem is non-serial polyadic. Parallel formulations are provided for several of these examples.
This document discusses various sorting algorithms that can be used on parallel computers. It begins with an overview of sorting and comparison-based sorting algorithms. It then covers sorting networks like bitonic sort, which can sort in parallel using a network of comparators. It discusses how bitonic sort can be mapped to hypercubes and meshes. It also covers parallel implementations of bubble sort variants, quicksort, and shellsort. For each algorithm, it analyzes the parallel runtime and efficiency. The document provides examples and diagrams to illustrate the sorting networks and parallel algorithms.
This document presents an implementation and analysis of parallelizing the training of a multilayer perceptron neural network. It describes distributing the calculations across processor nodes by assigning each processor responsibility for a fraction of nodes in each layer. Theoretical speedups of 1-16x are estimated and experimental speedups of 2-10x are observed for networks with over 60,000 nodes trained on up to 16 processors. Node parallelization provides near linear speedup for training multilayer perceptrons.
- One-to-all broadcast and all-to-one reduction operations can be performed efficiently on networks like rings, meshes, and hypercubes using recursive doubling or similar algorithms.
- All-to-all broadcast, reduction, and personalized communication generalize these operations and can be implemented using similar techniques while accounting for increasing message sizes.
- Operations like all-reduce, prefix-sums, scatter, gather and circular shift can also be implemented efficiently using these basic group communication patterns and algorithms.
The document discusses algorithm analysis and complexity analysis. It introduces big-O notation to classify algorithms based on how their runtime scales with input size. Common complexity classes include constant, logarithmic, linear, quadratic, and exponential time. The document explains how to determine the time complexity of algorithms by analyzing basic operations and ignoring constant factors. Loops are particularly important, as their runtime is determined by the number of iterations.
This document summarizes several algorithms for parallel matrix operations, including matrix-vector multiplication, matrix-matrix multiplication, and solving systems of linear equations via Gaussian elimination. For matrix-vector multiplication, it describes row-wise and column-wise partitioning approaches. For matrix-matrix multiplication, it discusses algorithms based on row/column broadcasting, Cannon's algorithm, and a 3D domain decomposition approach. For Gaussian elimination, it analyzes pipelined and 2D mapping implementations. The key aspects of parallelization, communication costs, computation loads, scalability, and cost efficiency are analyzed for each algorithm.
This document summarizes search algorithms for discrete optimization problems. It begins with an overview of discrete optimization and definitions. It then discusses sequential search algorithms like depth-first search, best-first search, A*, and iterative deepening search. The document next covers parallel search algorithms including parallel depth-first search using dynamic load balancing. It analyzes different load balancing schemes and evaluates them through experiments on satisfiability problems. Finally, it discusses techniques for termination detection in parallel search algorithms.
This document discusses parallel algorithms and models of parallel computation. It begins with an overview of parallelism and the PRAM model of computation. It then discusses different models of concurrent versus exclusive access to shared memory. Several parallel algorithms are presented, including list ranking in O(log n) time using an EREW PRAM algorithm and finding the maximum of n elements in O(1) time using a CRCW PRAM algorithm. It analyzes the performance of EREW versus CRCW models and shows how to simulate a CRCW algorithm using EREW in O(log p) time using p processors.
This document describes research using a 6-node supercomputer made of Raspberry Pi boards to calculate Dedekind numbers in parallel. The researchers implemented a parallel version of an existing algorithm to compute Dedekind numbers by dividing the workload across the 6 nodes. They present results showing the parallel implementation provides significant speedup over running the algorithm on a single node, though the Raspberry Pi hardware is less powerful than desktop computers.
Ajay Kumar.Ph.D Research scholar at National Institute of Technology my mail id:-- ajaymodaliger@gmail.com
In this presentation slide i have Explained how to reducing Computational time complexity of Discrete Fourier transform(DFT) from O(n^2 ) to nlogn through Radix-2 .FFT Algorithm in this work i have also introduced how we can use Radix-2 FFT in encrypted signal processing application by considering homomarphic properties(RSA) of Paillier cryptosystem.
This project report describes the implementation of the Fast Fourier Transform (FFT) algorithm using LabVIEW. The FFT is an optimized version of the Discrete Fourier Transform (DFT) that reduces redundant calculations, making it faster. The report defines the FFT and DFT, describes the FFT algorithm including twiddle factors and a 3-stage radix-2 approach. It discusses how FFT is applied using a divide and conquer method. The LabVIEW block diagram and front panel for input/output are shown. Applications of FFT include spectral analysis, digital filtering, medical imaging, and instrumentation.
AI optimizing HPC simulations (presentation from 6th EULAG Workshop)byteLAKE
See our presentation from the 6th International EULAG Users Workshop. We talked about taking HPC to the "Industry 4.0" by implementing smart techniques to optimize the codes in terms of performance and energy consumption. It explains how Machine Learning can dynamically optimize HPC simulations and byteLAKE's software autotuning solution.
Find out more about byteLAKE at: www.byteLAKE.com
This document discusses parallel matrix multiplication algorithms on the Parallel Random Access Machine (PRAM) model. It describes algorithms that multiply matrices using different numbers of processors, from n3 processors down to n2 processors. The time complexity is O(log n) in all cases, while the processor and work complexities vary based on the number of processors. Block matrix multiplication is also introduced as a more efficient approach for shared memory machines by improving data locality.
The document discusses the Cilk programming language and its runtime system for parallel programming. Cilk extends C with keywords like spawn and sync to express parallelism. It provides performance guarantees and automatically manages scheduling across processors. The runtime system uses work-stealing to map Cilk threads to processors with near-optimal efficiency. Cilk allows expressing parallelism while hiding low-level details like load balancing.
pptx - Psuedo Random Generator for Halfspacesbutest
This document summarizes research on constructing pseudorandom generators for halfspaces. The key results are:
1) The researchers developed a pseudorandom generator for halfspaces over arbitrary product distributions on Rn, requiring only that E[xi4] is constant. This improves on prior work that only handled the uniform distribution on {-1,1}n.
2) Their generator can simulate intersections of k halfspaces using a seed of length k log(n), and arbitrary functions of k halfspaces using a seed of length k2 log(n).
3) The generator exploits a "dichotomy" among halfspaces - they are either "dictator" functions depending on few variables, or
The document summarizes research on improving the training of multilayer perceptron (MLP) neural networks. It proposes using multiple optimal learning factors (MOLF) during training, which is shown to be equivalent to optimally transforming the net function vector in the MLP. For large networks, the MOLF Hessian matrix can become large, so the paper develops a method to compress the matrix into a smaller, well-conditioned form. Simulation results show the proposed algorithm performs almost as well as Levenberg-Marquardt but with the computational complexity of a first-order method.
The document describes MATLAB software and its uses for signal processing. MATLAB is a matrix-based program for scientific and engineering computation. It provides built-in functions for technical computation, graphics, and animation. The Signal Processing Toolbox contains functions for filtering, Fourier transforms, convolution, and filter design. The document lists some important MATLAB commands and frequently used signal processing functions, along with their syntax and purpose. It also describes the basic windows of the MATLAB interface and provides examples of generating common continuous and discrete time signals using MATLAB code.
This document discusses several common group communication operations used in parallel programs, including one-to-all broadcast, all-to-one reduction, all-to-all broadcast, all-reduce, and prefix-sum operations. It describes algorithms for implementing each of these operations on different network topologies like rings, meshes, and hypercubes. The algorithms are analyzed and their communication costs are derived in terms of the number of messages and message size.
SchNet: A continuous-filter convolutional neural network for modeling quantum...Kazuki Fujikawa
The document summarizes a paper about modeling quantum interactions using a continuous-filter convolutional neural network called SchNet. Some key points:
1) SchNet performs convolution using distances between nodes in 3D space rather than graph connectivity, allowing it to model interactions between arbitrarily positioned nodes.
2) This is useful for cases where graphs have different configurations that impact properties, or where graph and physical distances differ.
3) The paper proposes a continuous-filter convolutional layer and interaction block to incorporate distance information into graph convolutions performed by the SchNet model.
The Fast Fourier Transform (FFT) is a collection of techniques that exploits symmetries in the Discrete Fourier Transform (DFT) calculation to significantly reduce the computational complexity from O(N^2) to O(NlogN). It divides the DFT calculation into smaller pieces by splitting the input sequence into even and odd parts, recursively applying this splitting to obtain a reduction in computation time. A graphical representation shows how the direct DFT calculation becomes more efficient using the FFT approach.
This document discusses four parallel searching algorithms: Alpha-Beta search, Jamboree search, Depth-First search, and PVS search. Alpha-Beta search prunes unpromising branches without missing better moves. Jamboree search parallelizes the testing of child nodes. Depth-First search recursively explores branches until reaching a dead end, then backtracks. PVS search splits the search tree across processors, backing up values in parallel at each level. However, load imbalance can occur if some branches are much larger than others.
The document describes the fuzzy c-means (FCM) clustering algorithm. It begins by introducing FCM clustering and noting that each item can belong to more than one cluster with a probability distribution over the clusters. It then describes the objective function that FCM aims to minimize in each iteration and how it calculates the degree of membership for each data point to each cluster. Finally, it provides pseudocode for the FCM algorithm and describes how it initializes variables and checks for termination.
The document describes a min-cut based algorithm for power-aware scheduling that aims to minimize total leakage power while satisfying timing and resource constraints. It initializes all operations to high threshold voltage. If timing constraints are violated, it uses min-cut to select operations to switch to low threshold voltage. It then performs modified force-directed scheduling, checking resource constraints and using min-cut on a mobility overlap graph to select operations to switch voltages if constraints are violated. The output satisfies both timing and resource constraints with minimum leakage power.
The lab project aims to design and analyze different 16-bit adders including a full adder, ripple carry adder (RCA), 2's complement adder/subtractor, and linear carry select adder. The RCA uses 16 full adders in series and has the largest propagation delay. The 2's complement adder/subtractor performs addition and subtraction by taking the 2's complement of one input. A behavioral model of the adder/subtractor has lower delay than the gate-level model. The carry select adder splits the inputs into blocks and generates carry signals in parallel to reduce delay compared to the RCA, but it has more logic gates.
This project report describes the design of a 4-bit synchronous arithmetic logic unit (ALU) using a 250 nm silicon-on-insulator technology. The ALU can perform 4-bit addition, 2's complement, 1's complement, add-traction, NAND, and NOR operations based on operation codes. The schematic and layout designs of the ALU and its components were created in Cadence. Simulations of the ALU performing each operation were conducted to verify its functionality. In conclusion, the report presents the successful generation of schematic and layout designs for a 4-bit synchronous ALU along with simulation results.
Brunei is heavily reliant on oil and natural gas revenues, but these resources will be depleted within 30 years. To diversify its economy, Brunei is pursuing plans to become a financial hub and develop other industries. This includes attracting foreign direct investment, strengthening financial reserves and infrastructure, improving human capital, establishing an independent regulatory authority, and positioning itself as an Islamic finance hub for energy-related financial services.
This document discusses parallel algorithms and models of parallel computation. It begins with an overview of parallelism and the PRAM model of computation. It then discusses different models of concurrent versus exclusive access to shared memory. Several parallel algorithms are presented, including list ranking in O(log n) time using an EREW PRAM algorithm and finding the maximum of n elements in O(1) time using a CRCW PRAM algorithm. It analyzes the performance of EREW versus CRCW models and shows how to simulate a CRCW algorithm using EREW in O(log p) time using p processors.
This document describes research using a 6-node supercomputer made of Raspberry Pi boards to calculate Dedekind numbers in parallel. The researchers implemented a parallel version of an existing algorithm to compute Dedekind numbers by dividing the workload across the 6 nodes. They present results showing the parallel implementation provides significant speedup over running the algorithm on a single node, though the Raspberry Pi hardware is less powerful than desktop computers.
Ajay Kumar.Ph.D Research scholar at National Institute of Technology my mail id:-- ajaymodaliger@gmail.com
In this presentation slide i have Explained how to reducing Computational time complexity of Discrete Fourier transform(DFT) from O(n^2 ) to nlogn through Radix-2 .FFT Algorithm in this work i have also introduced how we can use Radix-2 FFT in encrypted signal processing application by considering homomarphic properties(RSA) of Paillier cryptosystem.
This project report describes the implementation of the Fast Fourier Transform (FFT) algorithm using LabVIEW. The FFT is an optimized version of the Discrete Fourier Transform (DFT) that reduces redundant calculations, making it faster. The report defines the FFT and DFT, describes the FFT algorithm including twiddle factors and a 3-stage radix-2 approach. It discusses how FFT is applied using a divide and conquer method. The LabVIEW block diagram and front panel for input/output are shown. Applications of FFT include spectral analysis, digital filtering, medical imaging, and instrumentation.
AI optimizing HPC simulations (presentation from 6th EULAG Workshop)byteLAKE
See our presentation from the 6th International EULAG Users Workshop. We talked about taking HPC to the "Industry 4.0" by implementing smart techniques to optimize the codes in terms of performance and energy consumption. It explains how Machine Learning can dynamically optimize HPC simulations and byteLAKE's software autotuning solution.
Find out more about byteLAKE at: www.byteLAKE.com
This document discusses parallel matrix multiplication algorithms on the Parallel Random Access Machine (PRAM) model. It describes algorithms that multiply matrices using different numbers of processors, from n3 processors down to n2 processors. The time complexity is O(log n) in all cases, while the processor and work complexities vary based on the number of processors. Block matrix multiplication is also introduced as a more efficient approach for shared memory machines by improving data locality.
The document discusses the Cilk programming language and its runtime system for parallel programming. Cilk extends C with keywords like spawn and sync to express parallelism. It provides performance guarantees and automatically manages scheduling across processors. The runtime system uses work-stealing to map Cilk threads to processors with near-optimal efficiency. Cilk allows expressing parallelism while hiding low-level details like load balancing.
pptx - Psuedo Random Generator for Halfspacesbutest
This document summarizes research on constructing pseudorandom generators for halfspaces. The key results are:
1) The researchers developed a pseudorandom generator for halfspaces over arbitrary product distributions on Rn, requiring only that E[xi4] is constant. This improves on prior work that only handled the uniform distribution on {-1,1}n.
2) Their generator can simulate intersections of k halfspaces using a seed of length k log(n), and arbitrary functions of k halfspaces using a seed of length k2 log(n).
3) The generator exploits a "dichotomy" among halfspaces - they are either "dictator" functions depending on few variables, or
The document summarizes research on improving the training of multilayer perceptron (MLP) neural networks. It proposes using multiple optimal learning factors (MOLF) during training, which is shown to be equivalent to optimally transforming the net function vector in the MLP. For large networks, the MOLF Hessian matrix can become large, so the paper develops a method to compress the matrix into a smaller, well-conditioned form. Simulation results show the proposed algorithm performs almost as well as Levenberg-Marquardt but with the computational complexity of a first-order method.
The document describes MATLAB software and its uses for signal processing. MATLAB is a matrix-based program for scientific and engineering computation. It provides built-in functions for technical computation, graphics, and animation. The Signal Processing Toolbox contains functions for filtering, Fourier transforms, convolution, and filter design. The document lists some important MATLAB commands and frequently used signal processing functions, along with their syntax and purpose. It also describes the basic windows of the MATLAB interface and provides examples of generating common continuous and discrete time signals using MATLAB code.
This document discusses several common group communication operations used in parallel programs, including one-to-all broadcast, all-to-one reduction, all-to-all broadcast, all-reduce, and prefix-sum operations. It describes algorithms for implementing each of these operations on different network topologies like rings, meshes, and hypercubes. The algorithms are analyzed and their communication costs are derived in terms of the number of messages and message size.
SchNet: A continuous-filter convolutional neural network for modeling quantum...Kazuki Fujikawa
The document summarizes a paper about modeling quantum interactions using a continuous-filter convolutional neural network called SchNet. Some key points:
1) SchNet performs convolution using distances between nodes in 3D space rather than graph connectivity, allowing it to model interactions between arbitrarily positioned nodes.
2) This is useful for cases where graphs have different configurations that impact properties, or where graph and physical distances differ.
3) The paper proposes a continuous-filter convolutional layer and interaction block to incorporate distance information into graph convolutions performed by the SchNet model.
The Fast Fourier Transform (FFT) is a collection of techniques that exploits symmetries in the Discrete Fourier Transform (DFT) calculation to significantly reduce the computational complexity from O(N^2) to O(NlogN). It divides the DFT calculation into smaller pieces by splitting the input sequence into even and odd parts, recursively applying this splitting to obtain a reduction in computation time. A graphical representation shows how the direct DFT calculation becomes more efficient using the FFT approach.
This document discusses four parallel searching algorithms: Alpha-Beta search, Jamboree search, Depth-First search, and PVS search. Alpha-Beta search prunes unpromising branches without missing better moves. Jamboree search parallelizes the testing of child nodes. Depth-First search recursively explores branches until reaching a dead end, then backtracks. PVS search splits the search tree across processors, backing up values in parallel at each level. However, load imbalance can occur if some branches are much larger than others.
The document describes the fuzzy c-means (FCM) clustering algorithm. It begins by introducing FCM clustering and noting that each item can belong to more than one cluster with a probability distribution over the clusters. It then describes the objective function that FCM aims to minimize in each iteration and how it calculates the degree of membership for each data point to each cluster. Finally, it provides pseudocode for the FCM algorithm and describes how it initializes variables and checks for termination.
The document describes a min-cut based algorithm for power-aware scheduling that aims to minimize total leakage power while satisfying timing and resource constraints. It initializes all operations to high threshold voltage. If timing constraints are violated, it uses min-cut to select operations to switch to low threshold voltage. It then performs modified force-directed scheduling, checking resource constraints and using min-cut on a mobility overlap graph to select operations to switch voltages if constraints are violated. The output satisfies both timing and resource constraints with minimum leakage power.
The lab project aims to design and analyze different 16-bit adders including a full adder, ripple carry adder (RCA), 2's complement adder/subtractor, and linear carry select adder. The RCA uses 16 full adders in series and has the largest propagation delay. The 2's complement adder/subtractor performs addition and subtraction by taking the 2's complement of one input. A behavioral model of the adder/subtractor has lower delay than the gate-level model. The carry select adder splits the inputs into blocks and generates carry signals in parallel to reduce delay compared to the RCA, but it has more logic gates.
This project report describes the design of a 4-bit synchronous arithmetic logic unit (ALU) using a 250 nm silicon-on-insulator technology. The ALU can perform 4-bit addition, 2's complement, 1's complement, add-traction, NAND, and NOR operations based on operation codes. The schematic and layout designs of the ALU and its components were created in Cadence. Simulations of the ALU performing each operation were conducted to verify its functionality. In conclusion, the report presents the successful generation of schematic and layout designs for a 4-bit synchronous ALU along with simulation results.
Brunei is heavily reliant on oil and natural gas revenues, but these resources will be depleted within 30 years. To diversify its economy, Brunei is pursuing plans to become a financial hub and develop other industries. This includes attracting foreign direct investment, strengthening financial reserves and infrastructure, improving human capital, establishing an independent regulatory authority, and positioning itself as an Islamic finance hub for energy-related financial services.
Slides reviewing the paper:
Vaswani, Ashish, Noam Shazeer, Niki Parmar, Jakob Uszkoreit, Llion Jones, Aidan N. Gomez, Łukasz Kaiser, and Illia Polosukhin. "Attention is all you need." In Advances in Neural Information Processing Systems, pp. 6000-6010. 2017.
The dominant sequence transduction models are based on complex recurrent orconvolutional neural networks in an encoder and decoder configuration. The best performing such models also connect the encoder and decoder through an attentionm echanisms. We propose a novel, simple network architecture based solely onan attention mechanism, dispensing with recurrence and convolutions entirely.Experiments on two machine translation tasks show these models to be superiorin quality while being more parallelizable and requiring significantly less timeto train. Our single model with 165 million parameters, achieves 27.5 BLEU onEnglish-to-German translation, improving over the existing best ensemble result by over 1 BLEU. On English-to-French translation, we outperform the previoussingle state-of-the-art with model by 0.7 BLEU, achieving a BLEU score of 41.1.
Parallel Computing 2007: Bring your own parallel applicationGeoffrey Fox
This document discusses parallelizing several algorithms and applications including k-means clustering, frequent itemset mining, integer programming, computer chess, and support vector machines (SVM). For k-means and frequent itemset mining, the algorithms can be parallelized by partitioning the data across processors and performing partial computations locally before combining results with an allreduce operation. Computer chess can be parallelized by exploring different game tree branches simultaneously on different processors. SVM problems involve large dense matrices that are difficult to solve in parallel directly due to their size exceeding memory; alternative approaches include solving smaller subproblems independently.
This document contains a lab manual for signals and systems experiments in the Department of Electronics and Communication Engineering at Shadan College of Engineering and Technology. It lists 12 experiments covering topics like frequency spectrum analysis of continuous and discrete signals, frequency response analysis using software and transfer functions, Fourier transforms, convolution, sampling, and filter design. It also provides an introduction to MATLAB, describing basic MATLAB windows, data types, commands, and functions for signals and systems applications.
Here are the portions of the state space tree generated by LCBB and FIFOBB for the given knapsack problems:
a) n=5, (p1,p2,p3,p4,p5)=(10,15,6,8,4), (w1,w2,w3,w4,w5)=(4,6,3,4,2) and m=12
LCBB:
1
2 3 4
7 8 9 10
5 6
FIFOBB:
1
2
3
7
4
5 6
8 9
b) n=5, (p1,p2,p3,
Introduction to data structures and complexity.pptxPJS KUMAR
The document discusses data structures and algorithms. It defines data structures as the logical organization of data and describes common linear and nonlinear structures like arrays and trees. It explains that the choice of data structure depends on accurately representing real-world relationships while allowing effective processing. Key data structure operations are also outlined like traversing, searching, inserting, deleting, sorting, and merging. The document then defines algorithms as step-by-step instructions to solve problems and analyzes the complexity of algorithms in terms of time and space. Sub-algorithms and their use are also covered.
Spark 4th Meetup Londond - Building a Product with Sparksamthemonad
This document discusses common technical problems encountered when building products with Spark and provides solutions. It covers Spark exceptions like out of memory errors and shuffle file problems. It recommends increasing partitions and memory configurations. The document also discusses optimizing Spark code using functional programming principles like strong and weak pipelining, and leveraging monoid structures to reduce shuffling. Overall it provides tips to debug issues, optimize performance, and productize Spark applications.
This document summarizes basic communication operations for parallel computing including:
- One-to-all broadcast and all-to-one reduction which involve sending a message from one processor to all others or combining messages from all processors to one.
- All-to-all broadcast and reduction where all processors simultaneously broadcast or reduce messages.
- Collective operations like all-reduce and prefix-sum which combine messages from all processors using associative operators.
- Examples of implementing these operations on different network topologies like rings, meshes and hypercubes are presented along with analyzing their communication costs. The document provides an overview of fundamental communication patterns in parallel computing.
Subproblem-Tree Calibration: A Unified Approach to Max-Product Message Passin...Varad Meru
Max-product message passing algorithms are commonly used for MAP inference in MRFs. Recent work showed these algorithms can be viewed as performing block coordinate descent in a dual objective. However, existing algorithms are limited by the restricted ways they select blocks to update. The paper proposes a "Subproblem-Tree Calibration" framework that subsumes MPLP, MSD, and TRW-S as special cases and allows more flexible block selection. The algorithm represents the problem as a subproblem multi-graph and calibrates potentials on randomly selected subproblem trees via message passing, achieving dual optimality with respect to the tree's block of variables. Experimental results show the approach converges to different dual objectives than existing methods.
A Simple Communication System Design Lab #4 with MATLAB SimulinkJaewook. Kang
This document outlines a communication systems design lab using MATLAB Simulink. It discusses implementing various components of a communication system including channels, phase splitters, up/down conversion, and more. The lab covers how to build subsystems, use MATLAB functions in Simulink, and bring variables from the workspace. The goal is to complete a target communication system by implementing a channel model using Simulink blocks, MATLAB functions, and variables from the workspace.
I am Samantha K. I am a Network Design Assignment Expert at computernetworkassignmenthelp.com. I hold a Master's in Computer Science from, McGill University, Canada. I have been helping students with their assignments for the past 13 years. I solve assignments related to Network Design.
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The document discusses the dynamic programming approach to solving the Fibonacci numbers problem and the rod cutting problem. It explains that dynamic programming formulations first express the problem recursively but then optimize it by storing results of subproblems to avoid recomputing them. This is done either through a top-down recursive approach with memoization or a bottom-up approach by filling a table with solutions to subproblems of increasing size. The document also introduces the matrix chain multiplication problem and how it can be optimized through dynamic programming by considering overlapping subproblems.
The document describes the syllabus for a course on design analysis and algorithms. It covers topics like asymptotic notations, time and space complexities, sorting algorithms, greedy methods, dynamic programming, backtracking, and NP-complete problems. It also provides examples of algorithms like computing greatest common divisor, Sieve of Eratosthenes for primes, and discusses pseudocode conventions. Recursive algorithms and examples like Towers of Hanoi and permutation generation are explained. Finally, it outlines the steps for designing algorithms like understanding the problem, choosing appropriate data structures and computational devices.
vFORTRAN is used as a numerical and scientific computing language. The main objective of the lab work is to understand FORTRAN language using which we solve simple numerical problems and compare different methodologies. Through this project we make use of various functions of FORTRAN and solve a simple projectile problem and also LAPACK library to solve a tridiagonal matrix problem. We use DGESV and DGTSV functions to make it possible. The given problems are built and compiled using a free integrated development environment called CODE::BLOCKS [1] which is an open source platform for FORTRAN and C.
This document contains information about the Digital Signal Processing lab at Shadan College of Engineering & Technology. It includes:
1. A list of 12 experiments to be conducted in the lab, related to topics like generating signals, implementing filters, and analyzing system responses.
2. An introduction to MATLAB, describing its basic functions and capabilities for numerical computation and signal processing.
3. Programs and instructions for carrying out specific DSP experiments in MATLAB, including generating basic signals, computing the DFT/IDFT of sequences, and determining the impulse/frequency responses of systems defined by difference equations.
The document provides students with an overview of the lab activities and teaches them how to use MATLAB for digital signal
DESIGN OF DELAY COMPUTATION METHOD FOR CYCLOTOMIC FAST FOURIER TRANSFORMsipij
In this paper the Delay Computation method for Common Sub expression Elimination algorithm is being implemented on Cyclotomic Fast Fourier Transform. The Common Sub Expression Elimination algorithm is combined with the delay computing method and is known as Gate Level Delay Computation with Common Sub expression Elimination Algorithm. Common sub expression elimination is effective
optimization method used to reduce adders in cyclotomic Fourier transform. The delay computing method is based on delay matrix and suitable for implementation with computers. The Gate level delay computation method is used to find critical path delay and it is analyzed on various finite field elements. The presented algorithm is established through a case study in Cyclotomic Fast Fourier Transform over finite field. If Cyclotomic Fast Fourier Transform is implemented directly then the system will have high additive complexities. So by using GLDC-CSE algorithm on cyclotomic fast Fourier transform, the additive
complexities will be reduced and also the area and area delay product will be reduced.
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1. Technology Mapping for Area
Minimization without breaking DAGs
into trees(updated red)
Lakshmi Yasaswi Kamireddy
RajKumar Balachandaran
2. Problem Formulation :
Technology Mapping for a DAG w/o breaking the DAG into trees
Heuristics for Area optimal Mapping
General ASICs hence the problem is very complex (NP - hard)
A cover is a collection of pattern graphs such that every node of the subject graph is
contained in one or more of the pattern graphs .The cover is further constrained so that each
input required by a pattern graph is actually an output of some other pattern.
For minimum area ,cost of cover is the sum of areas of gates in the cover .The technology
mapping problem is the optimization problem of finding a minimum cost covering of the
subject graph by choosing from the collection of pattern graphs for all gates in the library.
4. Earlier Algorithms for Area optimal mapping
Decomposing DAG into forest of trees and apply Technology Mapping for the forest of trees.
Disadvantage: Loss of some optimality
Advantage: Can be solved in polynomial time
Every node that has fan out greater than one will lead to creation of new tree
[K. Keutzer, IEEE DAC’87]
5. Tech Mapping for FPGAs [Flowmap-r]
Maximum Fan out Free Cone (MFFCV) - is an FFC of v such that for any non-PI node w, if
output(w) is a subset of MFFCV , then w is a node element of MFFCV
Algorithm:
This algorithm is a Dynamic Programming based algorithm
first form MFFCs for each individual node starting from nodes connected to output nodes
that is all the internal nodes MFFCs should also be formed then the algorithms starts
[Cong & Ding,IEEE DAC’93]
6. Tech Mapping for FPGAs [Flowmap-r] contd
Form all partitions P (X, X̅) in MFFCV such that X̅ is a FFCV , input (X̅) should be no more than K and hence the cut P of
MFFCV is K-feasible and can be mapped by K-input LUT
For each k-feasible cut P = (X,X̅) of MFFCV
- Cover X̅ with a K-LUT LUTV
P and partition X= MFFCV – X̅ into a set of disjoint MFFCs MFFCV1
P, MFFCV2
P…..
MFFCVM
P
- Then we recursively compute area optimal DF-mapping of each MFFCVi
P (1 ≤ i ≤ m)
- Cost P = 1 + 𝑖=1
𝑚
𝑎𝑟𝑒𝑎(MFFCVi
P) is computed where area(MFFCVi
P) is the area of the optimal DF-mapping
Choose the cut P with the least cost and this cost (P) gives the best area DF-mapping of MFFCV
Repeat the algorithm for all other N- MFFCV MFFC’s
[Cong & Ding,IEEE DAC’93]
7. Tech Mapping for DAG w/o Breaking into Trees
Extension of Flowmap-r --Approach1
Divide and conquer with DP --Approach2
Why MFFC formation:
Primary objective of forming MFFC is not to break DAGs into trees.
Secondary objective is that forming MFFCs makes the bigger problem into a set
of sub problems i.e, each MFFC is a sub DAG of the bigger DAG.
9. The previous algorithm [Flowmap-r] was based on K-input LUTs but a standard library can have gates varying from 1 to K-
input. The following is the algorithm for technology mapping without breaking into trees using extension of Flowmap-r.
Algorithm:
1. Form all partitions P (X, X̅ ) in MFFCV such that X̅ is a FFCV , input (X̅) should be equal to K and check if at least 1
partition in set P matches a library gate and if it does then proceed to Step 2 .
• Else, clear the partition set P and form new partitions P (X, X̅) such that X̅̅ is a FFCV, input (X¯) should be equal to K-
1 and check if at least 1 partition in set P matches a library gate and if it does then proceed to Step 2
• Else keep on continuing with input(X̅) =K-2. Map able proceed to step 2
• Therefore finally if none of the before formed partition does not match a library gate then we will take only the root
node as our FFCv because a single node of any gate type is map able in the library.
2. For each k-feasible cut P = (X,X̅) of MFFCV
• Cover X̅ with a K-input Library gate and partition X= MFFCV – X̅ into a set of disjoint MFFCs MFFCV1P,
MFFCV2P….. MFFCVMP
• Then we recursively compute area optimal mapping of each MFFCViP (1 ≤ i ≤ m)
• Cost P = 1 + 𝑖=1
𝑚
𝑎𝑟𝑒𝑎(MFFCViP) is computed where area(MFFCViP) is the area of the optimal mapping
3. Choose the cut P with the least cost and this cost (P) gives the best area DF-mapping of MFFCV
4. Repeat the algorithm for all other N- MFFCV MFFC’s
Approach 1 – Extension of Flowmap-r
10. Problem – Best area cover for DAG.
Form MFFC s for each node in the circuit.
Sub problem set 1- Best area cover for MFFCs of
output nodes and the other MFFCs that are left
over in the circuit.
Divide the problem until leaf nodes which are the
nodes connected to Primary Inputs.
Find the least cost area for the leaf node which will
be the gate itself.
Then add the leaf node solutions with the node for
which the leaf nodes are inputs to form the sub
problem solution.
Do this until you reach the output nodes and the
entire circuit is covered.
Sub problem 1
Sub problem 3
Sub problem 2
Approach 2 – Divide and conquer
The solution cost might be equal to the tree.
But the time complexity will be higher than the
tree.
11. In each sub problem again form sub problems until a
leaf problem is encountered (kind of a Divide and
Conquer approach)
Keep on dividing until we reach the leaf nodes.
Once we reach the leaf node find the best area gate to
map with the leaf node
Combine the solution of the leaf nodes(36,37) to
form the solution of the sub problem(38).
For each sub problem we get a best cost and we
combine with other sub problems(combine 38 and 39
to form 40) until we reach the main problem(41).
Approach 2 – Divide and conquer
12. MFFC Creation Algorithm
To get mffc, we perform the process in 2 steps.
• First generate mffc_dictionary, where for each node, we add itself and also, its
children with only one parent
• For children with shared parents, check if all the parents are in the grand parents,
then add child to each of grandparent
• Repeat the steps for every level on DAG and fill the mffc_dictionary
New slide
13. MFFC Pseudo Code
• def rget_mffc_single_parent(G, list_of_nodes, mffc_dict):
# temp list
temp_list = set()
for node in list_of_nodes:
# add node itself
mffc_dict[node].add(node)
# add parents of leaf to a new list
temp_list |= set(G.successors(node))
# check for children
children = G.predecessors(node)
if len(children) > 0:
for child in children:
if len(G.successors(child)) == 1:
mffc_dict[node] |= mffc_dict[child]
if len(temp_list) != 0:
rget_mffc(G, temp_list, mffc_dict)
return mffc_dict
14. MFFC Pseudo Code contd
• def rget_mffc(G, list_of_nodes, mffc_dict):
temp_list = set()
for node in list_of_nodes:
mffc_dict[node].add(node) //add node to itself
temp_list |= set(G.successors(node)) //get its parents
children = G.predecessors(node) //get its children for the current node
if len(children) > 0: //if it is not leaf node
for child in children:
parents_list = G.successors(child) //get its parent list
for parent in parents_list:
grand_parents_set |= set(G.successors(parent)) //get its grandparent
list
for grand_parent in grand_parents_set:
if set(parents_list).issubset(set(mffc_dict[grand_parent])):
mffc_dict[grand_parent].add(child)
• if len(temp_list) != 0:
rget_mffc(G, temp_list, mffc_dict)
return mffc_dict
15. Mappable MFFCs
• From the library for each logic expression extract variables and extract
operators based on parentheses.
• Pass inputs combinations to a parser and generate the truth tables
• This truth table parsing function is used to generate truth table for the
library gates
• So the outputs for all combination of inputs are compared with the
MFFC outputs and the map able MFFC are generated.
New slide
16. Best Possible Cover for minimum Area
• Our problem is to find the maximal cover (number of nodes) with minimal area.
• For the algorithm we have explained this turned out to be a weighted set cover problem which is one of the NP-complete
problems.
Set cover problem :Given a set of elements {1,2,...,m} (called the universe) and collection S of n sets whose union equals the
universe, the set cover problem is to identify the smallest sub-collection of S whose union equals the universe.
For example, consider the universe U={1,2,3,4,5} and the collection of sets S={{1,2,3},{2,4},{3,4},{4,5}}. Clearly the union
of S is U. However, we can cover all of the elements with the following, smaller number of sets: {{1,2,3},{4,5}}
In our case we find the min area MFFC to cover the entire DAG.
https://en.wikipedia.org/wiki/Set_cover_problem
New slide
17. Best Possible Cover for minimum Area
Inputs to the function are list of mappable MFFC ,G(V,E)
The nodes in the graph will be the universal set and the nodes in the MFFCs are the subsets.
Initially
area =0; // area of the nodes covered
Covered nodes=0 //number nodes covered
Create a priority queue sorted basing on least area MFFC
For each MFFC in list of MFFCs
Insert into priority queue
While covered nodes < length(number of nodes in DAG)
{
Pop an MFFC from priority queue
Update the area
Update covered nodes
Update sets with newly covered MFFC
{
For each newly covered MFFC
For each MFFC in the number of nodes in DAG
If this MFFC is not the popped from the priority queue
{Then discard this MFFC from the list of MFFCs
And push it to priority queue}
}
}
All the combinations are pushed
continuously into the priority queue
and the best is picked from it.
New slide
20. Sample results
The area calculated is only for the gates that are mapped from the library in
Mappable MFFC’s and the type of gate it is mapped to and the area for mappable
part.
NOTE:Please ignore the percentage it is for our reference to check for how much
percentage of the file has completed processing.
Number of nodes 6
Number of edges 6
Number of inputs 5
MFFC 16.67% 5 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
MFFC 33.33% 7 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
MFFC 50.00% 6 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
MFFC 83.33% 8 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
Mappable MFFC's 4
[['5'], ['7'], ['6'], ['8']]
Area=5568.0
IPT_0 [label = IPT ];
IPT_1 [label = IPT ];
IPT_2 [label = IPT ];
IPT_3 [label = IPT ];
IPT_4 [label = IPT ];
NND_5 [gate = NND ];
NND_6 [gate = NND ];
NND_7 [gate = NND ];
NND_8 [gate = NND ];
NND_9 [gate = NND ];
NND_10 [gate = NND ];
IPT_0 -> NND_5 [ name = 0 ];
IPT_2 -> NND_5 [ name = 1 ];
IPT_2 -> NND_6 [ name = 2 ];
IPT_3 -> NND_6 [ name = 3 ];
IPT_1 -> NND_7 [ name = 4 ];
NND_6 -> NND_7 [ name = 5 ];
NND_6 -> NND_8 [ name = 6 ];
IPT_4 -> NND_8 [ name = 7 ];
NND_5 -> NND_9 [ name = 8 ];
NND_7 -> NND_9 [ name = 9 ];
NND_7 -> NND_10 [ name = 10 ];
NND_8 -> NND_10 [ name = 11 ];
10 --> 10, 8
5 --> 5
6 --> 6
7 --> 7
8 --> 8
9 --> 5, 9
Dot file
MFFC
Final OutputC17.bench New slide
21. IPT_0 [label = IPT ];
IPT_1 [label = IPT ];
IPT_2 [label = IPT ];
IPT_3 [label = IPT ];
IPT_4 [label = IPT ];
IPT_5 [label = IPT ];
NND_6 [gate = NND ];
NND_7 [gate = NND ];
NND_8 [gate = NND ];
NND_9 [gate = NND ];
NND_10 [gate = NND ];
NND_11 [gate = NND ];
IPT_0 -> NND_6 [ name = 0 ];
IPT_1 -> NND_6 [ name = 1 ];
IPT_2 -> NND_7 [ name = 2 ];
IPT_3 -> NND_7 [ name = 3 ];
IPT_4 -> NND_8 [ name = 4 ];
IPT_5 -> NND_8 [ name = 5 ];
NND_6 -> NND_9 [ name = 6 ];
NND_7 -> NND_9 [ name = 7 ];
NND_7 -> NND_10 [ name = 8 ];
NND_8 -> NND_10 [ name = 9 ];
NND_9 -> NND_11 [ name = 10 ];
NND_10 -> NND_11 [ name = 11 ];
10 --> 10, 8
11 --> 10, 11, 6, 7, 8, 9
6 --> 6
7 --> 7
8 --> 8
9 --> 6, 9
Number of nodes 6
Number of edges 6
Number of inputs 6
MFFC 33.33% 7 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
MFFC 50.00% 6 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
MFFC 83.33% 8 [1, 1, 1, 0] [1, 1, 1, 0] type2 1392.0
Mappable MFFC's 3
[['7'], ['6'], ['8']]
Area = 4176.0
C1 example we have taken
Dot file
MFFC
Final Output
For bigger files please check the input output folder
New slide
22. References
[1] K. Keutzer and D. Richards. Computational complexity of logic synthesis and optimization in
Proceedings of International Workshop on Logic Synthesis, 1989.
[2] K. Keutzer. Dagon: Technology binding and local optimization by dag matching in Proceedings of
24th ACM/IEEE Design Automation Conference, 1987.
[3] J Cong , Y Ding “On Area/Depth Trade-off in LUT-Based FPGA Technology Mapping”, Design
Automation Conference (DAC), 1993
[4] Performing Technology Mapping and Optimization by DAG covering: A review of Traditional
Approaches.