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Library - Natural Language Toolkit

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Lesson Description


Lession - #514 Natural Language Toolkit-Getting Started


Installing NLTK

We can install NLTK on different OS as follows −

On Windows
To install NLTK on Windows OS, follow the underneath steps −
  • In the first place, open the Windows command prompt and explore to the area of the pip folder.
  • Then, enter the accompanying command to install NLTK −
pip3 install nltk

Presently, open the PythonShell from Windows Start Menu and type the accompanying command to confirm NLTK's installation −
Import nltk

If you get no error, you have successfully installed NLTK on your Windows OS having Python3.

On Mac/Linux
In order to install NLTK on Mac/Linux OS, write the following command −
sudo pip install -U nltk

In the event that you don't have pip installed on your PC, then, at that point, adhere to the guidance given beneath to initially install pip −
To begin with, update the package index by following utilizing following command −
sudo apt update

Now, type the following command to install pip for python 3 −
sudo apt install python3-pip

Through Anaconda
To install NLTK through Anaconda, follow the beneath steps −
To start with, to install Anaconda, go to the connection www.anaconda.com/dissemination/#download-area and afterward select the form of Python you really want to install.


Once you have Anaconda on your computer system, go to its command prompt and write the following command −
conda install -c anaconda nltk


You need to review the output and enter ‘yes’. NLTK will be downloaded and installed in your Anaconda package.

Downloading NLTK’s Dataset and Packages

Presently we have NLTK installed on our PCs however to utilize it we really want to download the datasets (corpus>
accessible in it. A portion of the significant datasets accessible are stpwords, guntenberg, framenet_v15, etc.
With the assistance of following commands, we can download all the NLTK datasets −
import nltk
nltk.download(>


You will get the following NLTK downloaded window.

Now, click on the download button to download the datasets.

How to run NLTK script?

Following is the model wherein we are executing Porter Stemmer algorithm by utilizing PorterStemmer nltk class. with this model you would have the option to comprehend how to run NLTK script.
To begin with, we really want to import the natural language toolkit(nltk>
.
import nltk

Now, import the PorterStemmer class to implement the Porter Stemmer algorithm.
from nltk.stem import PorterStemmer

Next, create an instance of Porter Stemmer class as follows −
word_stemmer = PorterStemmer(>

Now, input the word you want to stem. −
word_stemmer.stem('writing'>

Output
'write'

word_stemmer.stem('eating'>

Output
'eat'