Programmer Think

LPA(Label Propagation Algorithm) LPA algorithm was proposed by zhu et al in 2002. In 2007, it was applied to the field of community discovery by Usha, Nandini and Raghavan, and RAK algorithm was proposed. But most researchers call RAK algorithm LPA algorithm. LPA is a local community division based on Label Propagation. For each node in the n ...

catalogue Using random forest to evaluate the transaction price of second-hand cars Random forest principle previously on data sources Data preprocessing Data completion and variable deletion Data outlier handling Establishment and optimization of Stochastic Forest Model Tree selection Selection of independent variables Adjustment ...

brief introduction Whether doing scientific calculation or writing applications, we need to use some basic data structures, such as lists, tuples, dictionaries and so on. This article will explain these basic data structures in Python in detail. list A list is a list, which can be expressed in square brackets: In [40]: ages = [ 10, 14, 18, ...

catalogue 1. Add: (1) Method append (): you can add an element (the end) to the list (2) Method insert (): insert the element object before the index at the specified position (3) Method extend(): you can add elements from another collection to the list one by one 2. Change: modify according to the index 3. Check: (1) In: judge whether t ...

K-L (Kernighan Lin) algorithm Original paper( An efficient heuristic procedure for partitioning graphs) K-L (Kernighan Lin) algorithm is a dichotomy method that divides a known network into two communities of known size. It is a greedy algorithm. Its main idea is to define a function gain Q for network partition. Q is the difference between ...

Problem description Sometimes some files in the disk will be set with complex permissions by some programs. Please forgive me for my lack of knowledge and unable to reasonably explain the permission system of Windows. The problem after this setting is that when you want to delete the folder, you will be prompted that the folder access is d ...

Design idea: <(teaching-06) maximum number of addition and subtraction methods within 20 (optimized version 20220122 vs Python addition and subtraction method within 20) >The code can randomly generate up to addition questions and addition questions within x. A Xia tried to modify the code to make the list questions and quantity of &quot ...

Foundation of class class Dog: # This class is created from white space, so there are no parentheses in the definition # The first letter of the class should be capitalized def __init__(self, name, age): # init has two underscores on both sides, which is a special method # This method is defined to contain three for ...

When writing automation use-case code, I always write a lot of functions and have a confusing understanding of their parameters. Here's a simple summary and summary of how functions are used Function Definition def Function name(Formal parameter 1,Formal parameter 2,...): Code #If it is necessary to return a result to the caller, it ...

1. Sum of two numbers (double pointer) This was done earlier, using a hash table, with a time complexity of N But if you change your mind and use the double pointer you learned today, it will be easy to understand, although it will not decrease or increase in time complexity (the sorting complexity is NlogN). Idea: Sort first to get an order ...