The journey of a cheminformatics scientist
Please check out the previous blog posts from this series if you haven’t done so already: Part 1 algorithm for k-fold Cross-Validation Part 2A of the Nested Cross-Validation & Cross-Validation Series where I went through a python tutorial on implementing k-fold CV regressors using random forest (RF) from scikit-learn with a simple cheminformatics dataset with descriptors…
This is part 2A of the Nested Cross-Validation & Cross-Validation Series. I will go through a python tutorial on implementing k-fold CV regressors using random forest (RF) from scikit-learn with the first dataset: (A) a simple cheminformatics dataset with descriptors and endpoints of interest. In Part 2B, I will cover the same python tutorial for…
A few people have asked me to explain and share the code for Nested Cross-Validation. I think it makes sense for me to explain the basics of whats and whys in using the NeCV first before diving into the code, so I will be covering these topics in four separate blog posts. For part 1,…
Today’s tutorial is on applying unsupervised hierarchical clustering in R and generating circular dendrograms with nodes colored based on discrete categories, like in the figure shown below (Figure 1). Disclaimer: The above figure is generated with fake chemical data taken from different projects already published from my PhD years. I used R 4.0.2 and R…
This is the last of the five-part series tutorial of the blog post, Computing Molecular Descriptors – Intro, in the context of drug discovery. The goal of this post to explain the python code on creating new descriptors such as MRC (developed in MacrolactoneDB study) and using Mordred descriptors. What are MRC descriptors? MRC descriptors were…
This is part-4 from the five-part series tutorial of the blog post, Computing Molecular Descriptors – Intro, in the context of drug discovery. The goal of this post to explain the python code on computing 2D RDKit descriptors and exporting them as CSV files. First, install the required library packages using miniconda. The code for RDKit_2D class that…
This is part-3 from the five-part series tutorial of the blog post, Computing Molecular Descriptors – Intro, in the context of drug discovery. The goal of this post to explain the python code on computing Morgan ECFP fingerprints also known as ECFP6 (radius = 3) connectivity fingerprints. What Are ECFP Fingerprints? Please read this article and…
This is from the five-part series tutorial of the previous blog post, Computing Molecular Descriptors – Intro in the context of drug discovery. The goal of this post to explain the python code on computing MACCS fingerprints. Please read this blog to familiarize yourself with MACCS. The 166 public keys (fragment definitions) of MACCS in…
I will write a five-part series tutorial on implementing the python code to compute different sets of 2D molecular descriptors & fingerprints which are highly used in the context of drug discovery. Many thanks to the first-year Ph.D. students who request me to write tutorials on cheminformatics topics such as these. I welcome readers to…
Today’s tutorial is on applying Principal Component Analysis (PCA, a popular feature extraction technique) on your chemical datasets and visualizing them in 3D scatter plots. Quick Introduction on PCA! The following short description gives a good idea of what PCA is if you aren’t familiar with it. Principal Component Analysis (PCA) is a linear dimensionality reduction technique…