Tag: lookup

Solving LookupError: Resource [93maveraged_perceptron_tagger[0m not found. Please use the NLTK Downl

Table of Contents Solving LookupError: Resource [93maveraged_perceptron_tagger[0m not found. Please use the NLTK Downloader wrong reason Solution 1. Confirm the installation of NLTK 2. Import NLTK and open the downloader 3. Download the averaged_perceptron_tagger model 4. Exit the downloader in conclusion Solving LookupError: Resource [93maveraged_perceptron_tagger[0m not found. Please use the NLTK Downloader When using Python’s […]

ELF: symbol lookup via DT_HASH

referenced:https://flapenguin.me/elf-dt-hash libc.so contains tons of dynamic symbols exported to the outer world ( nm -D /lib/libc.so.6 | wc -l gives 3023 symbols on my machine). And quite a few of them will be imported in any relatively big program. Obviously, doing linear search would be a bad idea. Some sort of a hash table can […]

Keyword lookup in Postgresql

Query by keyword in Postgresql, generally using the like statement. for example: select name from poi where name like ‘%key word%’. But as we all know, this matching rate is not satisfactory. This article uses examples to use the pg_trgm extension to achieve a more perfect keyword query. Create a new data table as follows: […]

Core Features: How to scan images, lookup tables and measure times using OpenCV OpenCV v4.8.0

Previous tutorial: Mat – Basic Image Container Next tutorial: Mask operation on Mat matrix Original author Bernát Gábor Compatibility OpenCV >= 3.0 Goals We will seek answers to the following questions: How to view every pixel of an image? How to store OpenCV matrix values? How to measure the performance of our algorithm? What is […]

8b10b encoding based on FPGA lookup table

Article directory Preface 1. 8b10b encoding 2. Basic principles 3. Realization 4. Simulation Summarize references [1] https://blog.csdn.net/qq_37654178/article/details/112391245 [2] https://ieeexplore.ieee.org/document/5390392 //8b10b encoding original paper Foreword In high-speed serial communications, signals may be affected by noise, attenuation, and interference. In practical applications, encoding technologies such as 8b10b can be used to increase the anti-interference ability of signals, […]

Filter Shader–LookUpTable

https://hello-david.github.io/archives/f116047e.html Look Up Table (referred to as LUT, color lookup table) is a technology that reduces the amount of calculations on the GPU. By storing the color values in a cache table in advance, when operations are needed, the corresponding color values are directly indexed from this table. Essentially It can be seen as a […]

DuckDB’s AsOf join: fuzzy temporal lookup

Summary DuckDB supports AsOf Joins – a method of matching nearby values. They are particularly useful for searching event tables for temporal analysis. Have time series data you want to join but the timestamps don’t quite match? Or want to use time from another table to find values that change over time? Did you end […]

NTC temperature sampling binary lookup table and formula method

NTC temperature sampling: This article records the NTC temperature sampling, which is described using the binary lookup table method and the formula method. Resource download link:Excel generates array table https://download.csdn.net/download/qq_41359157/88326839?spm=1001.2014.3001.5503 NTC parameters: NTC sampling circuit: 1. Binary look-up table method: Binary search is very efficient. Assuming the data size is n, the data will be […]

Dynamic member lookup in Swift

Article directory Preface Basic introduction Basic example 1. Define a dynamic member access class: 2. Access nested dynamic members: Compile-time security using KeyPath KeyPath usage example KeyPath advanced usage examples 1. Dynamically access attributes: 2. Combine optional properties with KeyPath: 3. Dynamic KeyPath and dictionary: Summarize Foreword In Swift, dynamic member lookup is a mechanism […]