Rico's Nerd Cluster

「离开世界之前 一切都是过程」

Deep Learning - Gradient Checking

First Step To Debugging A Neural Net

How To Do Gradient Checking In calculus, we all learned that a derivative is defined as: \[\begin{gather*} f'(\theta) = \frac{f(\theta + \epsilon) - f(\theta)}{\epsilon} \end{gather*}\] ...

Posted by Rico's Nerd Cluster on January 4, 2022

Deep Learning - Introduction

Why Do We Even Need Deep Neuralnets? Data Partition, ML Ops, Data Normalization

Why Do We Need Deep Learning Any bounded continuous function can be approximated by an arbitrarily large single layer. W hy? The idea is roughly that the linear combinations of activation function...

Posted by Rico's Nerd Cluster on January 4, 2022

Computer Vision - Pinhole Camera Model

This Blog Shows How A Small Magic Peek Hole Captures The World

Introduction Camera is intriguing. There have been many different types with different types of lenses (such as fisheye, wide angle Lens). However, the most original (and the simplest) form of cam...

Posted by Rico's Nerd Cluster on July 3, 2021

Web Development - Reactive Design

React, Flask

React React itself is just a UI library and doesn’t bundle any network protocol or “live-update” mechanism under the hood. It re-renders your components whenever you call setState (or update state...

Posted by Rico's Nerd Cluster on June 3, 2021

Web Development - Flask

React, Flask

Launch an App Since Flask 2.2, threading is by default: app.run(threaded=True) # default since Flask 2.2 the Werkzeug dev server starts one OS‑level process and spawns a new thread...

Posted by Rico's Nerd Cluster on June 1, 2021

Computer Vision - Random Tree

Random Tree

Introduction Simple Example: Predicting Lottery Purchase with a Decision Tree Imagine we have two pieces of information about a person: Age Income The task is: we want to predict whether ...

Posted by Rico's Nerd Cluster on April 24, 2021

Computer Vision - MeanShift and CamShift: Tracking an Object by Its Color

MeanShift and CamShift are simple tracking algorithms. They do not understand that an object is a mine, vehicle, or person. Instead, they remember the object’s color distribution and search for pix...

Posted by Rico's Nerd Cluster on February 7, 2021

Computer Vision - Moiré Pattern

Noise Patterns Pattern Cause How to recognize it Moiré Two similar spatial patterns or grids Changes strongly with scale, angle, or res...

Posted by Rico's Nerd Cluster on February 4, 2021

Computer Vision - RANSAC

Introduction RANSAC means: RANdom SAmple Consensus. It is a robust fitting method for data with outliers. Normal least-squares fitting asks: What model minimizes total error over all points? RANSA...

Posted by Rico's Nerd Cluster on February 1, 2021

Computer Vision - Tessellation

Tessellation Tessellation means converting smooth CAD surfaces into a triangle mesh. Linear deflection controls how far the triangle mesh is allowed to deviate from the true CAD surface. Smaller l...

Posted by Rico's Nerd Cluster on January 30, 2021

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Robotics @ Northwestern University

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