Category Archives: CS Courses

Posted in OOP

Training Set, Validation Set, Test Set

Posted on May 28, 2017 | Leave a comment

Training Set is a subset of the dataset used to build predictive models.
Validation Set is a subset of the dataset used to assess the performance of model built in the training phase
– It provides a test platform for fine-tuning model’s parameters and selecting the best performing model
– Not all modeling algorithms need a validation set
Test set or unseen examples is a subset of the dataset to assess the likely future performance of a model.
– If a model fits the training set much better than it fits the test set. Overfitting is probably the cause

Binary Classification(two class classification)

true|false, 1|0, -1|+1, male|female

Multi-class classification problems can be seen as binary classification problems.

Model Evaluation:

https://en.wikipedia.org/wiki/Confusion_matrix

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Posted in Data Mining, Machine Learning

Tagged Model Evaluation

PHP OOP Project

Posted on April 22, 2017 | Leave a comment

Basic Simple Project By Me:

<?php

class Employee
{

    var $first;
    var $last;
    var $stat;
    var $uid;
    var $rate;
    var $hours;

    final public function __construct($f, $l, $st, $ui, $r, $ho)
    {
        $this->first = $f;
        $this->last = $l;
        $this->stat = $st;
        $this->uid = $ui;
        $this->rate = $r;
        $this->hours = $ho;
    }

    public function getALL()
    {
        echo "First Name:" . $this->first;
        echo "</br>";
        echo "Last Name:" . $this->last;
        echo "</br>";
        echo "Status:" . $this->stat;
        echo "</br>";
        echo "USerID:" . $this->uid;
        echo "</br>";
        echo "Pay Rate:$" . $this->rate;
        echo "</br>";
        echo "Housrs Worked:" . $this->hours;
        echo "</br>";
        echo "<b>Paycheck Amount:</b> $" . ($this->rate * $this->hours);
        echo "</br>";
        echo "</br>";

    }

}

class People extends Employee
{

}

$e = new People('JAddian', 'Forte', 'Manager', '521', '19', '40');
$e->getALL();

$e = new People('Victor', 'Davis', 'Assistant Manager', '231', '15', '33');
$e->getALL();

$e = new People('John', 'Clark', 'Worker', '687', '12', '26');
$e->getALL();

?>

<?php

class Employee

{

var $first;

var $last;

var $stat;

var $uid;

var $rate;

var $hours;

final public function __construct($f, $l, $st, $ui, $r, $ho)

{

$this->first = $f;

$this->last = $l;

$this->stat = $st;

$this->uid = $ui;

$this->rate = $r;

$this->hours = $ho;

}

public function getALL()

{

echo "First Name:" . $this->first;

echo "";

echo "Last Name:" . $this->last;

echo "";

echo "Status:" . $this->stat;

echo "";

echo "USerID:" . $this->uid;

echo "";

echo "Pay Rate:$" . $this->rate;

echo "";

echo "Housrs Worked:" . $this->hours;

echo "";

echo "Paycheck Amount: $" . ($this->rate * $this->hours);

echo "";

}

class People extends Employee

{

}

$e = new People('JAddian', 'Forte', 'Manager', '521', '19', '40');

$e->getALL();

$e = new People('Victor', 'Davis', 'Assistant Manager', '231', '15', '33');

$e->getALL();

$e = new People('John', 'Clark', 'Worker', '687', '12', '26');

$e->getALL();

By Others:
From OOP Fundamentals udemy Video project:

<?php

class Employee
{

    const MANAGER = 'MANAGER';
    const ASSISTANT_MANAGER='Assistant Manager';
    const WORKER='Worker';

//attributes
    protected $first;
    protected $last;
    protected $stat;
    protected $uid;
    protected $rate;
    protected $hours;

//class constructor
    final public function __construct($f, $l, $st, $ui, $r, $ho)
    {
        $this->first = $f;
        $this->last = $l;
        $this->stat = $st;
        $this->uid = $ui;
        $this->rate = $r;
        $this->hours = $ho;
    }

//function
    public function getALL()
    {
        echo "First Name:" . $this->first;
        echo "</br>";
        echo "Last Name:" . $this->last;
        echo "</br>";
        echo "Status:" . $this->stat;
        echo "</br>";
        echo "USerID:" . $this->uid;
        echo "</br>";
        echo "Pay Rate:$" . $this->rate;
        echo "</br>";
        echo "Housrs Worked:" . $this->hours;
        echo "</br>";
        echo "<b>Paycheck Amount:</b> $" . ($this->rate * $this->hours);
        echo "</br>";
        echo "</br>";
    }
} //end of employee class

class People extends Employee
{

}

$employee1 = new People('JAddian', 'Forte', People::MANAGER, '521', '19', '40');
$employee1->getALL();

$employee2 = new People('Victor', 'Davis', People::ASSISTANT_MANAGER, '231', '15', '33');
$employee2->getALL();

$employee3 = new People('John', 'Clark', Employee::WORKER, '687', '12', '26');
$employee3->getALL();

?>

<?php

class Employee

{

const MANAGER = 'MANAGER';

const ASSISTANT_MANAGER='Assistant Manager';

const WORKER='Worker';

//attributes

protected $first;

protected $last;

protected $stat;

protected $uid;

protected $rate;

protected $hours;

//class constructor

final public function __construct($f, $l, $st, $ui, $r, $ho)

{

$this->first = $f;

$this->last = $l;

$this->stat = $st;

$this->uid = $ui;

$this->rate = $r;

$this->hours = $ho;

}

//function

public function getALL()

{

echo "First Name:" . $this->first;

echo "";

echo "Last Name:" . $this->last;

echo "";

echo "Status:" . $this->stat;

echo "";

echo "USerID:" . $this->uid;

echo "";

echo "Pay Rate:$" . $this->rate;

echo "";

echo "Housrs Worked:" . $this->hours;

echo "";

echo "Paycheck Amount: $" . ($this->rate * $this->hours);

echo "";

}

} //end of employee class

class People extends Employee

{

}

$employee1 = new People('JAddian', 'Forte', People::MANAGER, '521', '19', '40');

$employee1->getALL();

$employee2 = new People('Victor', 'Davis', People::ASSISTANT_MANAGER, '231', '15', '33');

$employee2->getALL();

$employee3 = new People('John', 'Clark', Employee::WORKER, '687', '12', '26');

$employee3->getALL();

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Posted in OOP, PHP

PHP OOP: Class, Method, Object, Instance, Declare, Echo, Inheritance,Constructor,Access Control,Static!

Posted on April 18, 2017 | Leave a comment

PHP OOP example described here from edwin’s video:

<?php

class Car{
    var $wheels=4;
    var $hood=1;
    var $engine=1;
    var $doors=4;
    
    function MoveWheels(){
        //echo "Wheels move";
        //$this means reference inside the class for outside we need to create instance of a class with object and call by reference with variable or method to show;
        $this->wheels=4;
        
    }
    
    
    function CreateDoors(){
        $this->doors=6;
    }
}

$bmw=new Car(); //instance of the class
$truck=new Car(); //new instance for truck

$bmw->MoveWheels();
//$bmw->wheels=8;
echo $bmw->wheels."</br>";
echo $truck->wheels=10;
echo "<br>";
$truck->CreateDoors();
echo $truck->doors;

//if(class_exists("car", "MoveWheels")){
//    echo "Method Exists";
//}else{
//    echo "No";
//}
?>

<?php

class Car{

var $wheels=4;

var $hood=1;

var $engine=1;

var $doors=4;

function MoveWheels(){

//echo "Wheels move";

//$this means reference inside the class for outside we need to create instance of a class with object and call by reference with variable or method to show;

$this->wheels=4;

}

function CreateDoors(){

$this->doors=6;

}

$bmw=new Car(); //instance of the class

$truck=new Car(); //new instance for truck

$bmw->MoveWheels();

//$bmw->wheels=8;

echo $bmw->wheels."";

echo $truck->wheels=10;

echo " ";

$truck->CreateDoors();

echo $truck->doors;

//if(class_exists("car", "MoveWheels")){

// echo "Method Exists";

//}else{

// echo "No";

//}

Inheritance example:

<?php
class Car{

var $wheel=14;
var $hood=1;
var $engine=1;
var $doors=4;

function MoveWheeels(){
$this->wheels=14;
}

function CreateDoors(){
$this->doors=6;
}
}

class Plane extends Car{
 var $wheels=20;
}
$jet=new Plane();
echo $jet->wheels;
?>

<?php

class Car{

var $wheel=14;

var $hood=1;

var $engine=1;

var $doors=4;

function MoveWheeels(){

$this->wheels=14;

}

function CreateDoors(){

$this->doors=6;

}

class Plane extends Car{

var $wheels=20;

}

$jet=new Plane();

echo $jet->wheels;

Constructor:

<?php

class Car{
    var $wheels=4;
    var $hood=1;
    var $engine=1;
    var $doors=4;
    
    function __construct(){
        //echo "Wheels move";
        //$this means reference inside the class
       echo $this->wheels=4;
        
    }
    
    
    function CreateDoors(){
        echo $this->doors=6;
        echo "</br>";
    }
}


$truck=new Car();
echo "</br>";
echo $truck->CreateDoors();

?>

<?php

class Car{

var $wheels=4;

var $hood=1;

var $engine=1;

var $doors=4;

function __construct(){

//echo "Wheels move";

//$this means reference inside the class

echo $this->wheels=4;

}

function CreateDoors(){

echo $this->doors=6;

echo "";

}

$truck=new Car();

echo "";

echo $truck->CreateDoors();

Access control: Public, Private, Protected

<?php

class Car{
    public $wheels=4;
    protected $hood=1;
    private $engine=1;
    var $doors=4;
    
    function showProperty(){
        //echo "Wheels move";
        //$this means reference inside the class
        echo $this->engine;       
    }
}

$bmw=new Car(); //instance of the class
$semi=new Semi();
Class Semi extends Car{
    
    
}
echo $bmw->showProperty();
//echo $bmw->showProperty();
?>

<?php

class Car{

public $wheels=4;

protected $hood=1;

private $engine=1;

var $doors=4;

function showProperty(){

//echo "Wheels move";

//$this means reference inside the class

echo $this->engine;

}

$bmw=new Car(); //instance of the class

$semi=new Semi();

Class Semi extends Car{

}

echo $bmw->showProperty();

//echo $bmw->showProperty();

Static Data in Class:

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Posted in OOP, PHP

Tagged php OOP

Database Interview Questions

Posted on March 9, 2017 | Leave a comment

http://jompesh.com/videos/1/1760/lesson-26-database-normalization

Theory site: http://www.studytonight.com/dbms/generalization-and-specialization.php
Another Resource: http://www.guru99.com/database-normalization.html

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Posted in Database, SQL

SQL Join – Interview Clear

Posted on March 5, 2017 | Leave a comment

http://www.sql-join.com/sql-join-types/

In below: The relationship between the two tables is specified by the customer_id key, which is the “primary key” in customers table and a “foreign key” in the orders table:

customer_id
first_name
last_name
email
address
city
state
zipcode

1
George
Washington
gwashington@usa.gov
3200 Mt Vernon Hwy
Mount Vernon
VA
22121

2
John
Adams
jadams@usa.gov
1250 Hancock St
Quincy
MA
02169

3
Thomas
Jefferson
tjefferson@usa.gov
931 Thomas Jefferson Pkwy
Charlottesville
VA
22902

4
James
Madison
jmadison@usa.gov
11350 Constitution Hwy
Orange
VA
22960

5
James
Monroe
jmonroe@usa.gov
2050 James Monroe Parkway
Charlottesville
VA
22902

customer_id	first_name	last_name	email	address	city	state	zipcode
1	George	Washington	gwashington@usa.gov	3200 Mt Vernon Hwy	Mount Vernon	VA	22121
2	John	Adams	jadams@usa.gov	1250 Hancock St	Quincy	MA	02169
3	Thomas	Jefferson	tjefferson@usa.gov	931 Thomas Jefferson Pkwy	Charlottesville	VA	22902
4	James	Madison	jmadison@usa.gov	11350 Constitution Hwy	Orange	VA	22960
5	James	Monroe	jmonroe@usa.gov	2050 James Monroe Parkway	Charlottesville	VA	22902

order_id
order_date
amount
customer_id

1
07/04/1776
$234.56
1

2
03/14/1760
$78.50
3

3
05/23/1784
$124.00
2

4
09/03/1790
$65.50
3

order_id	order_date	amount	customer_id
1	07/04/1776	$234.56	1
2	03/14/1760	$78.50	3
3	05/23/1784	$124.00	2
4	09/03/1790	$65.50	3

Note that (1) not every customer in our customers table has placed an order and (2) there are a few orders for which no customer record exists in our customers table.

Inner Join Query:

select first_name, last_name, order_date, amount
from customer
inner join orders
on customer.customer_id=orders.customer_id

select first_name, last_name, order_date, amount

from customer

inner join orders

on customer.customer_id=orders.customer_id

Result:

first_name	last_name	order_date	amount
george	washington	07/04/1776	$234.56
john	adams	05/23/1784	$124.00
Thomas	Jefferson	03/14/1760	$78.50
Thomas	Jefferson	09/03/1790	$65.50

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Posted in Database, SQL

Tagged SQL Join

SQL

Posted on February 21, 2017 | Leave a comment

Good Learning Site for beginners:
Short:
http://www.dofactory.com/sql/left-outer-join
Elaborate:
https://www.w3schools.com/sql/sql_select.asp

Less Important But Okay:
https://www.tutorialspoint.com/sql/index.htm
Questions:

http://programabad.com/questions/5268/sql-normalization

http://www.studytonight.com/dbms/database-normalization.php

http://programabad.com/questions/3940/cgpa

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Posted in Database, SQL

Data Science MOOC (Will do someday)

Posted on February 18, 2017 | Leave a comment

http://www.kdnuggets.com/2015/09/top-20-data-science-moocs.html

https://lagunita.stanford.edu/courses/Home/Databases/Engineering/about

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Posted in Data Science, Database

Data Science: Discrete vs Continuous

Posted on January 29, 2017 | Leave a comment

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Posted in Data Mining, Data Science

Tagged Discrete vs Continuous

Making Predictions with WEKA

Posted on January 22, 2017 | Leave a comment

How to Save Your Machine Learning Model and Make Predictions in Weka

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Posted in Data Mining

Decision Tree

Posted on January 22, 2017 | Leave a comment

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Posted in Data Mining

Data Mining Deep Study – Confusion Matrix

Posted on January 13, 2017 | Leave a comment

A confusion matrix shows the number of correct and incorrect predictions made by the classification models compared by actual outcomes (target value) in the data.

Found a good lecture regarding confusion matrix with easy explanation for HIV AIDS. Video is found below and my own drawing regarding this is also given below:

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Posted in Data Mining, Data Science

Tagged confusion matrix

GTA V OpenAI

Posted on January 12, 2017 | Leave a comment

https://openai.com/blog/GTA-V-plus-Universe/

My parents don’t know I was a mad lover of GTA series since my school life(class 4)…When GTA V trailer was released in 2009 after my SSC, I upgraded my pc and waited a lot for releasing of this game but time passed and they delayed to release it. In my university life I was busy with academic stuffs so I barely get chances to play this game and my graphics card got jammed for not using too much. Recently Rockstar Games released Artificial Intelligence and other engineering behind this game. It is a pleasure for me now as I am understanding little bit of the engineering behind this game as a CS graduate. I was their die hard fan once upon a time and still I am. If I get some space in my life to play this game I am sure I can find the peace

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Posted in Artificial Intelligence

Tagged gta v, open ai

Category Archives: CS Courses

SOLID Concepts

Object Oriented Programming Concepts

OOP Clear

Training Set, Validation Set, Test Set

PHP OOP Project

PHP OOP: Class, Method, Object, Instance, Declare, Echo, Inheritance,Constructor,Access Control,Static!

Database Interview Questions

SQL Join – Interview Clear

Inner Join Query:

SQL

Data Science MOOC (Will do someday)

Data Science: Discrete vs Continuous

Making Predictions with WEKA

Decision Tree

Data Mining Deep Study – Confusion Matrix

GTA V OpenAI

Caution and Tips:

About Me & MyBlog

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Category Archives: CS Courses

Inner Join Query:

Caution and Tips:

About Me & MyBlog

Category

Recent Posts

Recent Comments

My Facebook

My Github

My Linkedin

Tags

Count per Day

Archives

This site is powered by:

Bookmarks

My Coding Page