Article directory MapReduce programming: data filtering and saving, UID deduplication 1. Experimental goals 2. Experimental requirements and precautions 3. Experimental content and steps Attachment: series of articles MapReduce programming: data filtering and saving, UID deduplication 1. Experimental objectives Proficient in writing Mapper class, Reducer class and main function Proficient in local testing methods Proficient in […]
Tag: reduce
[React] Use of useReducer and comparison with useState and useImmerReducer
Foreword For components with a lot of state update logic, event handlers that are too scattered may affect the readability of the code. In this case, all the state update logic of the component can be integrated into an external function, which is the reducer. Use useReducer(reducer, initialArg, init?) Parameters reducer: Pure function used to […]
Big data computing-Mapreduce framework
1． Programming to implement file merging and deduplication operations For two input files, namely file A and file B, please write a MapReduce program to merge the two files and remove duplicate content to obtain a new output file C. Below is a sample input file and output file for reference. (The input file is […]
The use of for, while, do While, for in, forEach, map, reduce, every, some, filter
The use of for, while, do While, for in, forEach, map, reduce, every, some, filter for let arr = [2, 4, 6, 56, 7, 88]; //for for (let i = 0; i < arr.length; i + + ) {<!– –> console.log(i + ‘:’ + arr[i]) //0:2 1:4 2:6 3:56 4:7 5:88 } An ordinary for […]
MapReduce programming: join operations and aggregation operations
Article directory MapReduce programming: join operations and aggregation operations 1. Experimental goals 2. Experimental requirements and precautions 3. Experimental content and steps Attachment: series of articles MapReduce programming: join operations and aggregation operations 1. Experimental objectives Understand the distributed processing workflow of the MapReduce computing framework Master the use of mapreduce computing framework to implement […]
Experiment 1. Basic programming methods of MapReduce
1. Experiment purpose Understand the MapReduce workflow; Master the basic programming methods of MapReduce; 2. Experimental platform Operating system: Linux (Ubuntu16.04 recommended); Hadoop version: 2.7.1; JDK version: 1.7 or above; Java IDE: IDEA 3. Experiment content (1). Word deduplication: deduplicate all words in a file and output them as deduplicated words (1)Write MapReduce code (2) […]
Several methods of CUDA’s reduce accumulation and summation
Several methods of CUDA’s reduce accumulation and summation 1. Introduction – CUDA C Programming Guide (nvidia.com) CUDA Webinar 2 (nvidia.com)?developer.download.nvidia.com/compute/cuda/1.1-Beta/x86_website/projects/reduction/doc/reduction.pdf Method 1: stride adjacent accumulation Each thread block performs a half reduction, that is, the adjacent ones within the thread block are added, and then the step size is multiplied by 2, and then added. […]
Can useReducer+createContext really replace Redux?
Concept useReducer useReducer is a state management hook provided by React, usually used to manage complex state logic of components. It takes two parameters: the reducer function and the initial state. The Reducer function accepts the current state and an action and returns a new state. This is somewhat similar to the reducer function in […]
Solving AttributeError: type object scipy.interpolate.interpnd.array has no attribute __reduce_cython’
Table of Contents Solving AttributeError: type object ‘scipy.interpolate.interpnd.array’ has no attribute ‘__reduce_cython’ Problem Description Solution Method 1: Upgrade the SciPy library Method 2: Lower the SciPy library version in conclusion Sample code: 2D interpolation using the SciPy library Introduction to SciPy library Main features Install SciPy library Solving AttributeError: type object ‘scipy.interpolate.interpnd.array’ has no attribute […]
These Map operations in Guava reduced my code size by 50%
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