Thursday, June 7, 2018

Getting every nth line from file

I had a problem recently where I wanted to extract every 5th line from file and I knew that every 10 lines data points to same 10 keys

awk 'NR%5 == 0' file.txt 

gave me that  

In general if we want to extract every nth line from  file with repeated section of length L

we can just do

awk 'NR%L == n' file.txt 

Friday, June 1, 2018

How to prepend text to all files in a directory

find  ./ -type f | xargs sed -i '1i wget \
chmod +x \
./ -b  \
source ~/.bashrc' $1

find ./ -type f   #Give all the files
xargs  # run thefollowing command
$1 #will be the file path

Sunday, October 29, 2017

Deep Learning personal notes

1. For Gradient descent the initialization of weight could be anything including zero, since function is convex it will always converge to <global or local?> minima

2. How to check if the pytorch has mkl or not ?
>>> torch.has_mkl

Wednesday, December 9, 2015

Using pickle to se/de-rialize in python.

 # Save a dictionary into a pickle file.
 import pickle
 favorite_color = { "lion": "yellow", "kitty": "red" }
 pickle.dump( favorite_color, open( "save.p", "wb" ) )

 # Load the dictionary back from the pickle file.
 import pickle
 favorite_color = pickle.load( open( "save.p", "rb" ) )
 # favorite_color is now { "lion": "yellow", "kitty": "red" }