# Top Machine Learning Topics For Beginners | Codersarts

Here the top 10 machine learning projects which help to learn the basic concept of machine learning. After completion of this we will learn some advanced topics of machine learning.

**1: Understanding Pandas**

Before start learning machine learning first know about the pandas, here we will learn pandas with the help of some questions which is given below:

**Consider the following Python dictionary data and Python list labels:**

```
data = {'birds': ['Cranes', 'Cranes', 'plovers', 'spoonbills', 'spoonbills', 'Cranes', 'plovers', 'Cranes', 'spoonbills', 'spoonbills'], 'age': [3.5, 4, 1.5, np.nan, 6, 3, 5.5, np.nan, 8, 4], 'visits': [2, 4, 3, 4, 3, 4, 2, 2, 3, 2], 'priority': ['yes', 'yes', 'no', 'yes', 'no', 'no', 'no', 'yes', 'no', 'no']}
labels = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
```

**Create a DataFrame birds from this dictionary data which has the index labels.**

**Sol.**

```
#import libraries
import pandas as pd
import numpy as np
```

Read data:

`data = {'birds': ['Cranes', 'Cranes', 'plovers', 'spoonbills', 'spoonbills', 'Cranes', 'plovers', 'Cranes', 'spoonbills', 'spoonbills'], 'age': [3.5, 4, 1.5, np.nan, 6, 3, 5.5, np.nan, 8, 4], 'visits': [2, 4, 3, 4, 3, 4, 2, 2, 3, 2], 'priority': ['yes', 'yes', 'no', 'yes', 'no', 'no', 'no', 'yes', 'no', 'no']}`

Creating a data frame:

```
birds = pd.DataFrame(data, index = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'])
birds
```

### Do itself

Display a summary of the basic information about birds DataFrame and its data.

Print all the rows with only 'birds' and 'age' columns from the dataframe

select [2, 3, 7] rows and in columns ['birds', 'age', 'visits']

select the rows where the number of visits is less than 4

select the rows with columns ['birds', 'visits'] where the age is missing i.e NaN

Select the rows where the birds is a Cranes and the age is less than 4

Select the rows the age is between 2 and 4(inclusive)

Find the total number of visits of the bird Cranes

Calculate the mean age for each different birds in dataframe.

**2: Practice to write the functions in Python**

After learning pandas next one is how to write code using functions in python because the function in python machine learning is an important part, here we have provided some questions so you can practice here if you face any issue you can ask with codersarts experts.

### Do it itself:

1. Write a function that inputs a number and prints the multiplication table of that number

2. Write a program to print twin primes less than 1000. If two consecutive odd numbers are both primes then they are known as twin primes

3. Write a program to find out the prime factors of a number.

Example: prime factors of 56 -

2, 2, 2, 7

4. Write a program to implement these formulae of permutations and combinations.

Number of permutations of n objects taken r at a time: p(n, r) = n! / (n-r)!. Number of

combinations of n objects taken r at a time is: c(n, r) = n! / (r!*(n-r)!) = p(n,r) / r!

5. Write a function that converts a decimal number to binary number

6. Write a function cubesum() that accepts an integer and returns the sum of the cubes of

individual digits of that number. Use this function to make functions PrintArmstrong() and

isArmstrong() to print Armstrong numbers and to find whether is an Armstrong number.

7. Write a function prodDigits() that inputs a number and returns the product of digits of that number.

8. If all digits of a number n are multiplied by each other repeating with the product, the one digit number obtained at last is called the multiplicative digital root of n. The number of times digits need to be multiplied to reach one digit is called the multiplicative

persistance of n.

Example: 86 -> 48 -> 32 -> 6 (MDR 6, MPersistence 3)

341 -> 12->2 (MDR 2, MPersistence 2)

Using the function prodDigits() of previous exercise write functions MDR() and

MPersistence() that input a number and return its multiplicative digital root and

multiplicative persistence respectively

9. Write a function sumPdivisors() that finds the sum of proper divisors of a number. Proper divisors of a number are those numbers by which the number is divisible, except the number itself. For example proper divisors of 36 are 1, 2, 3, 4, 6, 9, 18

10. A number is called perfect if the sum of proper divisors of that number is equal to the

number. For example 28 is perfect number, since 1+2+4+7+14=28. Write a program to

print all the perfect numbers in a given range

11. Two different numbers are called amicable numbers if the sum of the proper divisors of each is equal to the other number. For example 220 and 284 are amicable numbers.

Sum of proper divisors of 220 = 1+2+4+5+10+11+20+22+44+55+110 = 284

Sum of proper divisors of 284 = 1+2+4+71+142 = 220

12. Write a function to print pairs of amicable numbers in a range

**3. Practice to write code in Python: without numpy or sklearn**

Now we will practice writing code without any libraries like NumPy or sklearn.

### Do it itself:

Print the product of two matrices without any libraries

Select a number randomly with probability proportional to its magnitude from the given array of n elements

Replace the digits in the string with #

Find the closest points:

Your task is to find 5 closest points(based on cosine distance) in S from P

If you need any help related to any of the above topics which is most important in machine learning then you can contact us here:

contact@codersarts.com