OpenGenus Tech Review Team

Machine Learning (ML)

Implementing CNN in Python with Tensorflow for MNIST digit recognition

In this article, we will develop and train a convolutional neural network (CNN) in Python using TensorFlow for digit recognifition with MNIST as our dataset. We will give an overview of the MNIST dataset and the model architecture we will work on before diving into the code.

Machine Learning (ML)

Logistic Regression in Python with TensorFlow

We will walk you though the difference between Linear and Logistic Regression and then, take a deep look into implementing Logistic Regression in Python using TensorFlow. We used the Iris dataset and have trained and plotted the loss function and the training and test accuracy across epochs

C Programming

Storage classes in C

A Storage Class defines the scope (visibility) and life-time of variables and/or functions within a C Program. They precede the type that they modify. Storage classes are used in C programming are Automatic variables (auto), External variables (extern) Static variables (static) and Register variable

Algorithms

Circle Sort

Circle sort is a sorting algorithm in which diametrically opposite elements are compared to each other and swapped with an average time complexity of O(N log N) and space complexity of O(1). It is an unstable, recursive, parallelizable, in place sorting algorithm

Data Structures

K Dimensional Tree / (K D Tree)

K Dimensional tree (or k-d tree) is a tree data structure that is used to represent points in a k-dimensional space. It is used for various applications like nearest point (in k-dimensional space), efficient storage of spatial data, range search. We implemented it in C++ and explained the operations

Machine Learning (ML)

Training, saving and loading Artificial Neural Networks in Keras

We demonstrate how to code a Artificial neural network model and train and save it in JSON or H5 format which can be loaded later for any inference task. We use Keras/ TensorFlow to demonstrate this transfer learning and used Pima Indian Diabetes dataset in CSV format

Machine Learning (ML)

Random Decision Forest

Random forests or random decision forests are an ensemble learning method for classification, regression and other tasks that operates by constructing a multitude of decision trees at training time. There are three important hyperparameters namely n_estimators, random_state and max_features

Machine Learning (ML)

Generative Model

A Generative Model is a way of learning any kind of data distribution. Generative modeling algorithms process the training data and make reductions in the data. The main aim is to learn the true data distribution of the training set so that the new data points are generated with some variations.

Machine Learning (ML)

Discriminative Model

Discriminative models, also referred to as conditional models, are a class of models used in statistical classification, especially in supervised machine learning. Discriminative modelling studies the P(y|x) i.e, it predicts probability of y(target) when given x(training samples).

Machine Learning (ML)

XGBoost

XGBoost is short for extreme gradient boosting. It is an optimized distributed gradient boosting library designed to be highly efficient, flexible and portable. It implements machine learning algorithms under the Gradient Boosting framework. It provides a parallel tree boosting known as GBDT, GBM

Machine Learning (ML)

Independent Component Analysis (ICA)

Independent component analysis (ICA) is a statistical and computational technique for revealing hidden factors that underlie sets of random variables, measurements, or signals and is a special case of blind source separation. A common application is to listen to one person's speech in a noisy room

C++

Threads in C++

Threads are generally referred to as lightweight processes and executes different parts of a program and shares memory, file descriptors and system resources. We explore multithreading creation of threads with free, member function, functor object, lambda expression, race condition with mutex

C Programming

Dynamic memory allocation in C

The process of allocating memory at run time is known as dynamic memory allocation. Although C does not inherently have this facility, there are four library routines that can be used for allocating and freeing memory during program execution: malloc, calloc, realloc and free

C++

Function Overriding in C++

Function overriding (compile time polymorphism) is a feature in C++ that allows us to have a function in child class which is already present in the parent class. A child class inherits the data members and member functions of parent class and to override functionality, function overriding is used

C++

Function Overloading in C++

Function overloading is a feature in C++ where two or more functions can have the same name but different parameters. This is used in situations when a class B is inherits from class A and a particular behaviour of the class B needs to be modified.

Algorithms

Conversion of Infix to Postfix Expression using Stack

To convert Infix expression to Postfix expression, we will use the stack data structure. By scanning the infix expression from left to right,if we get any operand, simply add it to the postfix form, and for the operator and parenthesis, add them in the stack maintaining the precedence of them.

C++

for loop in C++

For loop has three components: initialization Statement, test Expression and update Statement. We have explored for loop in C++ and presented examples and compared it with while loop.

C Programming

Static memory allocation in C

In C, the default way of memory allocation is static. Static memory allocation is an allocation technique which allocates a fixed amount of memory during compile time and the operating system internally uses a data structure known as Stack to manage it We define static variables and how to delete it

Software Engineering

goto statement in C

The goto statement is a jump statement which is sometimes also referred to as unconditional jump statement. The goto statement can be used to jump from anywhere to anywhere within a function. The use of goto statement is highly discouraged and can be avoided using break and continue statements.

Software Engineering

Break Statement in C

Break Statement is a loop control statement which is used to terminate the loop. As soon as the break statement is encountered from within a loop, the loop iterations stops there and control returns from the loop immediately to the first statement after the loop. break can be used in all loop

Software Engineering

Error Handling in C

In C when some error occurs then -1 or NULL value is returned and a global variable errno is set with the error code.Hence we use returned values to check errors. We use EXIT_SUCCESS ,EXIT_FAILURE to deal with errors. There are three types of errors syntax, logical and semantic.

Data Structures

Hash Map / Hash table

Hash map (hash table, unordered map, dictionary, hash set) is a widely used efficient data structure that used to store data which can be searched in constant time O(1). This data structure is implemented over an array that maps keys to values that is it is a set of key value pairs.

Machine Learning (ML)

Linear Regression in Python with TensorFlow

In this guide, we will implement Linear Regression in Python with TensorFlow. Linear Regression is a simple yet effective prediction that models any data to predict an output based on the assumption that it is modeled by a linear relationship.

Algorithms

Binary Lifting with k-th ancestor and lowest common ancestor (LCA)

Binary Lifting is a technique used to find the k-th ancestor of any node in a tree in O(log N). This also leads to a faster algorithm in finding the lowest common ancestor (LCA) between two nodes in a tree. The technique requires preprocessing the tree in O(N log N) using dynamic programming.

Python

Create arrays in Numpy

Numpy functions that we have covered are arange(), zeros(), ones(), empty(), full(), eye(), linspace() and random(). Creating and managing arrays is one of the fundamental and commonly used task in scientific computing. Numpy is a Python library which adds support for several mathematical operations