Lemmatisation and What is it?

Hello Guys.
Today we are going to to see what is Lemmatisation.

Lemmatisation.

Lemmatisation (or lemmatization) in linguistics is that the process of grouping together the inflected sorts of a word in order that they may be analysed as one item, identified by the word's lemma, or dictionary form.In linguistics, lemmatisation is that the algorithmic process of determining the lemma of a word supported its intended meaning.
Lemmatisation is usually utilized in NLP, The machine goes the all the words, and reduces it to their base form which then will have same meaning if put together in an exceedingly sentence.

As to what is the dictionary meaning of this ?

For example, in English, the verb 'to care' may appear as 'care', 'caring', 'cared. The base form, 'care', that one might look up in a dictionary, is called the lemma for the word

Why Lemmatisation ?

The goal of both stemming(similar to lemmatization, please refer post by Arman for more details) and lemmatization is to scale back inflectional forms and sometimes derivationally related sorts of a word to a typical base form.
For Example :

As you can see here, all the words origin from the base word Trouble, so the lemmatized word from trouble, troubling, troubled and troubles is the same TROUBLE.

Similary here, the lemmatised word is Goose.

Algorithms

A trivial way to do lemmatization is by simple dictionary lookup, which be very length and complex but result accurate words which would have proper meaning in the context.

Thank you for reading this.
if you got any doubts? please feel free to ask in the comments below.

By Kapil Kadadas