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Linear Regression in Python | Gradient Descend | Data Science Interview Machine Learning Interview

TIMESTAMP

- 00:00 Linear Regression Overview
- 03:58 Gradient Descend
- 06:32 Linear Regression Implementation
- 10:48 Time and Space Complexity

#python #data-science #interview-questions

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When installing Machine Learning Services in SQL Server by default few Python Packages are installed. In this article, we will have a look on how to get those installed python package information.

When we choose Python as Machine Learning Service during installation, the following packages are installed in SQL Server,

**revoscalepy**– This Microsoft Python package is used for remote compute contexts, streaming, parallel execution of rx functions for data import and transformation, modeling, visualization, and analysis.**microsoftml**– This is another Microsoft Python package which adds machine learning algorithms in Python.**Anaconda 4.2**– Anaconda is an opensource Python package

#machine learning #sql server #executing python in sql server #machine learning using python #machine learning with sql server #ml in sql server using python #python in sql server ml #python packages #python packages for machine learning services #sql server machine learning services

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So far in our journey through the Machine Learning universe, we covered several big topics. We investigated some **regression** algorithms, **classification** algorithms and algorithms that can be used for both types of problems (**SVM****, ****Decision Trees** and Random Forest). Apart from that, we dipped our toes in unsupervised learning, saw how we can use this type of learning for **clustering** and learned about several clustering techniques.

We also talked about how to quantify machine learning model **performance** and how to improve it with **regularization**. In all these articles, we used Python for “from the scratch” implementations and libraries like **TensorFlow**, **Pytorch** and SciKit Learn. The word optimization popped out more than once in these articles, so in this and next article, we focus on optimization techniques which are an important part of the machine learning process.

In general, every machine learning algorithm is composed of three integral parts:

- A
**loss**function. - Optimization criteria based on the loss function, like a
**cost**function. **Optimization**technique – this process leverages training data to find a solution for optimization criteria (cost function).

As you were able to see in previous articles, some algorithms were created intuitively and didn’t have optimization criteria in mind. In fact, mathematical **explanations** of why and how these algorithms work were done later. Some of these algorithms are **Decision Trees** and **kNN**. Other algorithms, which were developed later had this thing in mind beforehand. **SVM**is one example.

During the training, we change the parameters of our machine learning model to try and **minimize** the loss function. However, the question of how do you change those parameters arises. Also, by how much should we change them during training and when. To answer all these questions we use **optimizers**. They put all different parts of the machine learning algorithm together. So far we mentioned **Gradient Decent** as an optimization technique, but we haven’t explored it in more detail. In this article, we focus on that and we cover the **grandfather** of all optimization techniques and its variation. Note that these techniques are **not** machine learning algorithms. They are solvers of **minimization** problems in which the function to minimize has a gradient in most points of its domain.

Data that we use in this article is the famous *Boston Housing Dataset* . This dataset is composed 14 features and contains information collected by the U.S Census Service concerning housing in the area of Boston Mass. It is a small **dataset** with only 506 samples.

For the purpose of this article, make sure that you have installed the following _Python _libraries:

- **NumPy **– Follow
**this guide**if you need help with installation. - **SciKit Learn **– Follow
**this guide**if you need help with installation. **Pandas**– Follow**this guide**if you need help with installation.

Once installed make sure that you have imported all the necessary modules that are used in this tutorial.

```
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from sklearn.model_selection import train_test_split
from sklearn.metrics import mean_squared_error
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import SGDRegressor
```

Apart from that, it would be good to be at least familiar with the basics of **linear algebra**, **calculus** and **probability**.

Note that we also use simple **Linear Regression** in all examples. Due to the fact that we explore **optimization**techniques, we picked the easiest machine learning algorithm. You can see more details about Linear regression **here**. As a quick reminder the formula for linear regression goes like this:

where *w* and *b* are parameters of the machine learning algorithm. The entire point of the training process is to set the correct values to the *w* and *b*, so we get the desired output from the machine learning model. This means that we are trying to make the value of our **error vector** as small as possible, i.e. to find a **global minimum of the cost function**.

One way of solving this problem is to use calculus. We could compute derivatives and then use them to find places where is an extrema of the cost function. However, the cost function is not a function of one or a few variables; it is a function of all parameters of a machine learning algorithm, so these calculations will quickly grow into a monster. That is why we use these optimizers.

#ai #machine learning #python #artificaial inteligance #artificial intelligence #batch gradient descent #data science #datascience #deep learning #from scratch #gradient descent #machine learning #machine learning optimizers #ml optimization #optimizers #scikit learn #software #software craft #software craftsmanship #software development #stochastic gradient descent

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In this Data Science With Python Training video, you will learn everything about data science and python from basic to advance level. This python data science course video will help you learn various python concepts, AI, and lots of projects, hands-on demo, and lastly top trending data science and python interview questions. This is a must-watch video for everyone who wishes o learn data science and python to make a career in it.

#data science with python #python data science course #python data science #data science with python

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A couple of days ago I started thinking if I had to start learning machine learning and data science all over again where would I start? The funny thing was that the path that I imagined was completely different from that one that I actually did when I was starting.

I’m aware that we all learn in different ways. Some prefer videos, others are ok with just books and a lot of people need to pay for a course to feel more pressure. And that’s ok, the important thing is to learn and enjoy it.

So, talking from my own perspective and knowing how I learn better I designed this path if I had to start learning Data Science again.

As you will see, my favorite way to learn is going from simple to complex gradually. This means starting with practical examples and then move to more abstract concepts.

#data-science #machine-learning #artificial-intelligence #python-top-story #data-science-top-story #learn-python #learn-data-science

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For this week’s data science career interview, we got in touch with Dr Suman Sanyal, Associate Professor of Computer Science and Engineering at NIIT University. In this interview, Dr Sanyal shares his insights on how universities can contribute to this highly promising sector and what aspirants can do to build a successful data science career.

With industry-linkage, technology and research-driven seamless education, NIIT University has been recognised for addressing the growing demand for data science experts worldwide with its industry-ready courses. The university has recently introduced B.Tech in Data Science course, which aims to deploy data sets models to solve real-world problems. The programme provides industry-academic synergy for the students to establish careers in data science, artificial intelligence and machine learning.

“Students with skills that are aligned to new-age technology will be of huge value. The industry today wants young, ambitious students who have the know-how on how to get things done,” Sanyal said.

#careers # #data science aspirant #data science career #data science career intervie #data science education #data science education marke #data science jobs #niit university data science