Amazon DynamoDB is a NoSQL database service hosted on AWS. It is a fully managed and scalable document store database. It is quite similar to MongoDB.
As the data grows, scan operation on full table would return parts of the data with the LastEvaluatedKey. The application should initiate scan again …
Configuring and managing multiple SSH keys for GIT accounts, in Ubuntu is shown below:
Using ssh-keygen create a public/private key and name it as user1_github, user1_bitbucket
create a file ~/.ssh/config and put the following in it.
# user1 github account
Host user1_github
HostName github.com
PreferredAuthentications publickey
IdentityFile ~/.ssh …With timeseries data we often require to resample on different intervel to feed in to our analytics model.
Pandas resample have a built-in list of widely used methods. However, if the built-in methods are not sufficient, it is always possible to write a custom function to resample.
This post shows …
Building python visualization of the famous Birthday paradox or Birthday problem.
Birthday problem, is to find the probability of a pair from the given set of randomly chosen people to have same birthday.
Given, we have 365 days (ignoring February 29th). The following chart shows how the probability increases with …
While maintaining GIT repositories, in some cases, we might be required to add an empty directory as a placeholder to mean something or we wanted all the files in a directory to stay local. However in GIT we can add only files to the repository and not the directory.
I …
I was getting following exeption in WebSocket client, when trying to connect Tornado WebSocket server.
WebSocket connection to 'ws://localhost:5678/echo' failed: Error during WebSocket handshake: Unexpected response code: 403
and on the server-side log
WARNING:tornado.access:403 GET /echo (::1) 6.00ms
A simple Echo WebSocket server …
Edit the file /etc/default/tomcat7
change the line
#AUTHBIND=no
to
AUTHBIND=yes
and run the following commands
$ sudo touch /etc/authbind/byport/80
$ sudo chmod 500 /etc/authbind/byport/80
$ sudo chown tomcat7 /etc/authbind/byport/80
Hope this helps.
In this post, I'll walk through scikit-learn's DecisionTreeClassifier from loading the data, fitting the model and prediction.
I'm going to use the vertebrate dataset from the book Introduction to Data Mining by Tan, Steinbach and Kumar.
We need to predict the class label of the last record from the dataset …
The Apache Hadoop is a framework that allows for distributed processing of large data sets across clusters of computers using MapReduce.
The steps listed below is to build and package hadoop from source code. This guide assumes a fresh installation of Ubuntu 14.04 version.
While writing Pig script, usually we use PigStorage for loading a CSV file.
Consider a sample CSV file in the following format.
2,Loading successfull,2014-09-25
3,Loading successfull,2014-09-25
4,Loading successfull,2014-09-25
can be loaded as
logs = LOAD 'log_folder/log_file.csv' USING …