Ronny Restrepo's Blog
http://ronny.rest/blog
Ronny's Personal BlogblogCalculating the derivative of Tanh - step by step
http://ronny.rest/blog/post_2017_08_16_tanh/
http://ronny.rest/blog/post_2017_08_16_tanh/## Summary
I recently created a [blog post](/blog/post_2017_08_10_sigmoid/)
outlining how to calculate the gradients
for the sigmoid activation function step by step. In this post, I will
...Derivatives for logistic regression - step by step
http://ronny.rest/blog/post_2017_08_12_logistic_regression_derivative/
http://ronny.rest/blog/post_2017_08_12_logistic_regression_derivative/## Motivation
The training step in logistic regression involves updating the weights
and the bias by a small amount. The amount that each weight and bias is
updated by is proportional to th...Partial Derivatives Along a Computational Graph
http://ronny.rest/blog/post_2017_08_11_graph_calculus/
http://ronny.rest/blog/post_2017_08_11_graph_calculus/## Computational graph
A computational graph is essentially a sequence of operations that are
applied on values. Mathematical equations can be broken down into a set
of smaller steps, and we...Derivative of the Sigmoid function - a worked example
http://ronny.rest/blog/post_2017_08_10_sigmoid/
http://ronny.rest/blog/post_2017_08_10_sigmoid/## Summary
Although I have practical experience with machine learning, I do have gaps
in my knowledge regarding the mathematics behind deep learning. So today I
worked on calculating the derivat...Using Pretrained GloVe word vectors
http://ronny.rest/blog/post_2017_08_04_glove/
http://ronny.rest/blog/post_2017_08_04_glove/## Summary
I have been working on a
[sentiment analysis project](https://github.com/ronrest/senty) project
recently, and have been looking for ways to improve the performance of
my model.
...Point Cloud to 360 Degree Panorama
http://ronny.rest/blog/post_2017_04_03_point_cloud_panorama/
http://ronny.rest/blog/post_2017_04_03_point_cloud_panorama/## Summary
A [few days ago](/blog/post_2017_03_25_lidar_to_2d) I created a function that creates 360 degree panoramas from
point cloud data. The problem with that previous implementation was tha...Creating Organized Tutorials on Processing Point Cloud Data
http://ronny.rest/blog/post_2017_04_01_creating_tuts/
http://ronny.rest/blog/post_2017_04_01_creating_tuts/Today I spent the day organizing the work I have done over the past week on
processing point cloud data into a set of tutorials. This was done to make the
relevant tasks easier
to find in the...ROS and ROS bags - Part3
http://ronny.rest/blog/post_2017_03_30_ros3_and_lidar/
http://ronny.rest/blog/post_2017_03_30_ros3_and_lidar/## Summary
Today I continued with extracting data from the rosbag files. I made
improvements on extracting the images, and also worked on extracting the lidar
point clouds.
# Color images
...ROS and ROS bags - Part2
http://ronny.rest/blog/post_2017_03_30_ros2/
http://ronny.rest/blog/post_2017_03_30_ros2/## Summary
I spent today learning more about ROS and how to process ROS bag files in python.
## Cooking the Monster in the Bag
So I played around with some of the examples in the [rosbag coo...ROS and ROS bags
http://ronny.rest/blog/post_2017_03_29_ros/
http://ronny.rest/blog/post_2017_03_29_ros/## Summary
I spent today learning about ROS and how to process ROS bag files.
## Background
Even though the data for the Didi challenge was released on the 22nd of March,
I was not able to...Creating Height Slices of Lidar Data
http://ronny.rest/blog/post_2017_03_27_lidar_height_slices/
http://ronny.rest/blog/post_2017_03_27_lidar_height_slices/## Summary
Today I worked on extending the work I did [yesterday](/blog/post_2017_03_26_lidar_birds_eye/) for creating birds-eye
view images of the Lidar data from the Kitti dataset. The task wa...Lidar Birds Eye Views
http://ronny.rest/blog/post_2017_03_26_lidar_birds_eye/
http://ronny.rest/blog/post_2017_03_26_lidar_birds_eye/## Summary
Today i started working on creating birds eye view images of the LIDAR data.
## Quirks of the Lidar Coordinates
One thing to keep in mind about the LIDAR data is that the axes repr...Lidar Data to 2D
http://ronny.rest/blog/post_2017_03_25_lidar_to_2d/
http://ronny.rest/blog/post_2017_03_25_lidar_to_2d/## Summary
Today I worked on projecting Lidar data to 2D images. I was hoping to create
"front views" and birds eye views of the lidar data, unforunately I was only
able to work on "front view...Created a Blog and Improved Lidar Visualisation
http://ronny.rest/blog/post_2017_03_24_blog_and_lidar/
http://ronny.rest/blog/post_2017_03_24_blog_and_lidar/This blog post is in the process of being updated
## Summary
- Today i decided to create a blog for my website, using django.
- wanted to start of 2D projections of LIDAR data but did not get ...Didi Challenge - Lidar Data
http://ronny.rest/blog/post_2017_03_23-didi_challenge2017/
http://ronny.rest/blog/post_2017_03_23-didi_challenge2017/This blog post is in the process of being updated
## Summary
- Learning how LIDAR data is represented
- Visualising in Matplotlib - very slow
- Frustrations with getting Mayavi installed an...