Learn how to add a new Cognito user to DynamoDB (using lambda as the intermediary) as soon as the user’s sign up is confirmed.
Author: Yash Sanghvi
Delete a Cognito User using AWS Lambda Python
Learn how to delete users from Cognito using lambda functions in two ways: admin_delete_user and delete_user. Also see how the two methods compare.
Send retained messages from a thing to AWS IoT Core
Learn how to send retained messages from a thing to the AWS IoT Core, and how to view the retained messages on the IoT Core Console.
AWS IoT Core – Using Basic Ingest to reduce costs
Learn how to use basic ingest to save on messaging costs, which form a big chunk of the total costs incurred during the interaction of things with AWS IoT Core.
ESP32 – Connect to best WiFi from multiple options
In lab or in field, it is desirable to add multiple WiFi credentials to ESP32 and allow it to connect to the best option. Learn how to do that using WiFiMulti.
K-fold cross-validation in Scikit Learn
Get introduced to the concept of K-fold cross validation, and understand its implementation in scikit learn with an example.
Triggering a Lambda using Rules in AWS IoT Core
Learn how to trigger an AWS Lambda if the incoming messages on a topic in AWS IoT Core satisfy certain conditions. Article includes rule creation and testing.
Scikit Learn: Scaling of features
Learn why feature scaling is important and how to perform it using scikit learn. Also learn about the difference between the two most popular scalers.
Publishing from Lambda to an AWS IoT Topic
Learn how to publish a message from AWS Lambda to a topic on AWS IoT Core. We use the python 3.6 runtime in this tutorial.
Scikit learn: f1-weighted vs. f1-micro vs. f1-macro
Learn the difference between the three types of averages that you can get for f1 score for a multi-class classification problem: weighted, macro and micro.