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Principle introduction The optimization criterion of Fischer algorithm is to minimize the bit error rate of the system under the constraints of the determined total system rate and transmission power. Fischer algorithm gives the closed form solution of bit allocation, which first puts the noise power value on each subchannel ...

start A battle between job seekers and interviewers is taking place in a business building in Hangzhou. Interviewer: introduce yourself first. Angela: Hello, interviewer. I'm the three bitches in the grass, the strongest single (Daji refuses to accept), the grass motorcycle driver, the promoter of the 21st set of radio gymnastics and the suc ...

Summary of relevant codes of machine learning Summary of machine learning related codes XGBoost There is one in sklearn, but there is another one with more powerful functions, as long as pip3 install xgboost Can be installed, but this installation process is really twists and turns. Then, we need to know the general process used by xgboo ...

catalogue introduce background So we need to be more complicated Points of interest A QA question needs "last week's data", which makes me think. Using the DATEADD function with a "WW" interval is easy, but it subtracts 7 days from today. This is different from "last week", because "last week" sta ...

Conversion between VOC dataset (xml format) and COCO dataset (json format) Let's first look at the directory structure of voc and coco datasets: Take the VOC2012 dataset as an example, there are five folders below: The Annotations folder is the XML file corresponding to the image. For example, "2007_000027.xml" stores the informatio ...

1, Foreword Write in front: it took a day to sort out the data collected by small codewords. It's helpful for you. One key three times in a row. Ha, thank you!! HashMap is often encountered in our daily development. The source code and underlying principle of HashMap must be asked in the interview. Therefore, we should master it, which is ...

catalogue 1. Know Redis What can Redis do? characteristic 2. Basic knowledge Redis is single threaded Why is Redis single thread so fast? 3. Redis five data types 1,String 2,List 3,Set 4,Hash 5,Zset 4. Redis has three special data types 1,geospatial 2,hyperloglog 3,Bitmaps 5. Redis transaction 6. Redis implements optimistic ...

logistic regression summary What is logistic regressionAlthough Logistic Regression is called regression, it is actually a classification model, which is often used in secondary classification. Logistic Regression is widely used because of its simplicity, parallelization and strong interpretability. Second classification (also known as logica ...

Structural pattern mainly involves how to combine various objects in order to obtain a better and more flexible structure. Although the object-oriented inheritance mechanism provides the most basic function of subclass extending the parent class, the structural pattern not only uses inheritance simply, but also realizes more flexible functions ...

datetime64 Foundation In numpy, we can easily convert the string to the time date type datetime64 (datetime has been occupied by the date time library contained in python). datatime64 is a date time type with units as follows: [example] when creating datetime64 type from string, by default, numpy will automatically select the corresponding ...