• Interpretation of 100 billion level OLAP engine


    Introduction:Data bank is a commercial data product operated by brand consumers. Because its core analysis ability needs to realize free analysis in any dimension and strong demand for response time on massive data, we use analyticdb as the underlying analysis engine on a large scale. Finally, with low cost and excellent performance, we support millions […]

  • Bitarray is good, but please don’t abuse it. Another online memory explosion check


    1: Background 1. Tell a story The day before yesterday, I wrote an article about checking the large memory, which is very popular in the garden. This is the happiest thing to do as we media. We should simply have another one to satisfy everyone’s appetite. Last month, I wrote a blog about using itbitmapYes, […]

  • A powerful tool for data driven by didi: group improvement of AB experiment


    Ju Mei’s Guide: in today’s big Internet companies advocate data-driven, AB experiment is an important tool for our decision-making analysis. There will be many links in one experiment. Today, I’d like to share with you a new method to improve the uniformity of grouping in the grouping section of didi experimental platform. This paper will […]

  • Data visualization: 4. The secret of scatter diagram


    Reference source: vitu.ai In the previous article, you have learned how to draw histogram and thermodynamic diagram. Next, let’s learn scatter diagram, which is the best tool to study the relationship between two variables Set up your notebook Let’s just set it up at the beginning import pandas as pd import matplotlib.pyplot as plt import […]

  • Crowd flow monitoring and safety management upgrading


    [usage strategy] [traffic statistics] 1. Overall descriptionEvery year in winter and summer vacation, May 1st, 11th and Spring Festival, there will be a large number of people in specific tourist attractions, stations and other areas. In an area, too much people flow is easy to cause stampede accidents. Human flow statistics can be used to […]