Tag：latitude
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Time：2021-10-13
At present, more and more businesses are based on LBS, nearby people, takeout locations, nearby businesses, etc. now let’s discuss the solution to the business scenario closest to me. Currently known solutions are: MySQL custom function calculation MySQL geo index Mongodb geo index PostgreSQL PostGIS index redis geo ElasticSearch This paper tests the performance of […]
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Time：2021-10-8
Sparse vectors usually contain many dimensions. establishFeature combinationWill result in more dimensions. Due to the use of such high latitude feature vectors, the model may be very large and require a lot of ram.In high latitude sparse vectors, it is best to reduce the weight to exactly 0 as much as possible. A weight of […]
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Time：2021-9-28
Apple trees produce both high-quality and moth eaten fruit. Apples sold in high-end convenience stores are 100% perfect fruit. From the orchard to the fruit store, someone spends a lot of time removing bad apples or coating salvageable apples with a thin layer of wax. As a machine learning engineer, You will spend a lot […]
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Time：2021-7-5
The text and pictures of this article are from the Internet, only for learning and communication, and do not have any commercial use. If you have any questions, please contact us in time. The following article comes from Zen of Python data analysis, written by little dull bird preface Today I would like to […]
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Time：2021-5-4
Generally speaking, the linear distance between two points we usually see when calculating latitude and longitude is directly linked to the distance between the driving and cycling curves, as the map docking of APP docking map, official account and other small programs, etc., so the two cannot be equated attention. Here are two ways to […]
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Time：2021-4-3
1. Classification of main data types of redis There are five data types commonly used to store data in redis: string, list, set, sorted set and hash. It is very important for us to master the command of these five data structures to store data in redis for us to understand the API of operating […]
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Time：2021-2-18
Geohash precision and principle Transferred from:https://www.cnblogs.com/feiquan/p/11380461.html The basic principle of geohash is to understand the earth as a two-dimensional plane, recursively decompose the plane into smaller sub blocks, and each sub block has the same coding in a certain latitude and longitude range. This method is simple and rough, and can meet the latitude and […]
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Time：2020-11-27
HTML5 Geolocation Locate the user The HTML5 geolocation API is used to get the user’s geographic location. Since this feature may infringe the privacy of users, the location information of users is not available unless they agree. be careful:Geolocation is more accurate for devices with GPS, such as the iPhone. geographyGeography; location; geo + location; […]
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Time：2020-11-13
This article is included in personal blog: http://www.chengxy-nds.top , technical data sharing and learning together Yesterday, a buddies of the official account and I discussed an interview question. Personally, it was more meaningful. I arranged it here to share it with you. The interview question is relatively simple: “let you realize the function of a […]
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Time：2020-6-4
introduction Yesterday, a buddies of the official account and I discussed an interview question. Personally, it was more meaningful. I arranged it here to share it with you. The interview question is relatively simple: “let you realize the function of a nearby person, what plan do you have?” In fact, this question is mainly to […]
