natural language processing is fun

 a good article

https://medium.com/@ageitgey/natural-language-processing-is-fun-9a0bff37854e

word tokenization
stop words

reverse a string in python

a="imdelda"
a1=list(a)
for i in range(len(a1)/2):
    tmp=a1[i]
    a1[i]=a1[len(a1)-i-1]
    a1[len(a1)-i-1]=tmp
a2="".join(a1)
print(a2)

how to improve the coding efficiency

How to improve the efficiency of your scripts? This problem may take one some years to accomplish.

Currently, here are some videos of programming on youtube hours long, for example :

https://www.youtube.com/watch?v=PJlAnR3asGQ&t=18011s

they can help ppl to learn scripts from beginning

And there are some books on coding efficiency:

https://www.amazon.com/Effective-Python-Specific-Software-Development/dp/0134034287

https://www.amazon.com/Effective-Specific-Improve-Programs-Designs/dp/0321334876



But to improve the efficiency of your coding, one needs to study on github etc constantly.  But github only shows some portion of the scripts in the world. A lot companies, they use bitbucket to store the scripts internally. The scripts there are not public.

I saw some people's scripts, very efficient. I will post some here.

deep learning , what it is

deep learning is the technique of machine learning for ai. it uses neural networks etc.

here is a tutorial for it on r-bloggers.com

https://www.r-bloggers.com/step-by-step-tutorial-deep-learning-with-tensorflow-in-r/

here is a video for it:

https://livevideo.manning.com/module/52_1_1/deep-learning-with-r-in-motion/getting-started/welcome-to-the-video-series?utm_source=rstudio&utm_medium=partner_website&utm_campaign=livevideo_deeplearningwithrinmotion&utm_content=unit1_rstudio

and a r-bloggers.com post for it:

https://www.r-bloggers.com/getting-started-with-deep-learning-in-r/

r-bloggers.com

r-bloggers.com is a comprehensive website for statistics and r programming. If you want to learn things about statistics and r programming , you can search the subject you want to study and " r-bloggers.com" on google, mostly  you will find out what you want to learn.