• ## The most violent solution of 0 ~ 1 knapsack problem

Time：2021-12-6

Pure violence solution of 0 ~ 1 knapsack problem analysis When selecting items to put into the backpack, there are only two options for each item, i.e. put in and not put in. Therefore, in the case of n items, when the most violent means are used to solve, the worst time complexity should be […]

• ## Knapsack problem_ Overview (dynamic programming)

Time：2021-11-22

Write before image.png Problem description There are n items and a backpack with a maximum weight of W. An item has only two attributes: weight and value. The weight of the ith article is weight [i], and the value obtained is value [i].Each item can only be used once, find out which items are loaded […]

• ## Recommended system algorithm related notes

Time：2021-11-18

LFM argot model (ALS) is used for offline recommendation, and item CF model (item similarity and score need to be weighted) is used for real-time recommendation. 1、 Introduction 1.1 recommended system principle image.png Classification:1. Recommendation based on demography: Based on user‘s basic data2. Content based recommendation: basic data based on items3. Recommendation based on collaborative […]

• ## Crazy NFT market, 10 second short video costs \$6.6 million

Time：2021-11-10

In October 2020, Rodriguez fleck, an art collector in Miami, USA, spent nearly \$67000 to buy a 10 second short video. It is puzzling that this video can be easily found on the Internet. Last week, something even more puzzling happened. He sold the 10 second video for \$6.6 million. Created by the digital artist […]

• ## Reading papers on fairness of recommendation system (5)

Time：2021-10-25

My main task these days is to review the thesis “towards long term fairness in recommendation”[1]The algorithm described in is programmed, and then the effect of the algorithm is tested and recorded. The following describes my work in four parts: detailed implementation of model algorithm, data set, model evaluation criteria and test result record. Detailed […]

• ## Reading papers on fairness of recommendation system (6)

Time：2021-10-24

As the reading record of the last paper, I decided to summarize my rough and intensive reading papers so far, and then state some personal opinions and ideas in this research field. Paper summary The bias and unfairness in the recommendation system are born with the birth of the recommendation algorithm, not deliberately. Some typical […]

• ## Causal inference – a new idea to solve the fairness of recommendation system

Time：2021-10-23

Paper introduction In recent years, the fairness of recommendation system has become a new hotspot. Among all the methods to solve the problem of fairness, causal inference is particularly attractive. Based on the paper recommendations as treatments: debiasing learning and evaluation[1]As an introduction, let’s see how causal inference is applied to the fairness research of […]

• ## Tencent released “warehouse express” and issued “ID card” for each commodity!

Time：2021-10-6

Release a real news: 2021At the China e-commerce food materials Festival, Tencent cloud officially released a plan for the catering and food industry“Warehouse Express”Food traceability platform. “Warehouse express” integrates the mature middle platform capability of Tencent cloud, Tencent’s leading security technology and code chain technology, as well as the diversified industry components and algorithms of […]

• ## Prediction and analysis of customer purchase possibility of machine learning recommendation system

Time：2021-9-27

Last week, I wrote an article “prediction and analysis of customer purchase possibility in bank telemarketing based on machine learning”, which is the first attempt to verify the prediction and analysis of customer purchase possibility. Today is the second verification case of customer purchase possibility prediction analysis based on machine learning: recommendation system. Recommendation system […]

• ## Is Amazon sp-api document tired? That’s it!

Time：2021-7-14

We do cross-border e-commerce, do Amazon API development all understand, the first thing is the document thing, Amazon’s Chinese document is very pit, there is wood（ Originally, the English documents are quite boring. Keep your voice down (BB ~) OK, make complaints about it. Now we are entering the topic. Our team considers that many […]

• ## [dynamic programming / knapsack problem] knapsack problem stage one final chapter: hybrid knapsack problem

Time：2021-7-5

preface Today is the 11th part of the dynamic programming topic “knapsack problem“. Today we will learn about the mixed knapsack problem, which is also the last section of the first stage of our knapsack problem. Today, I will first review the three knapsack problems I learned before. Then, through a “mixed knapsack” problem, we […]

• ## Amazon sp-api’s incorrect packing list and how to combine the cartons

Time：2021-7-4

scene Recently, we need to do the demand of the goods department, which involves the API related to delivery and warehousingfulfillment-inbound-api Official document path:fulfillment-inbound-api The specific steps learned from the goods department are as follows: Create an inboundshipmentplan Then create an inboundshipment, Finally, get the getlabels After understanding these again, I made the following attempt […]