Sentiment Analysis in Natural Language Processing

Sentiment Analysis in tongue process

Sentiment Analysis could be a method that’s wont to confirm if a bit of text is neutral, negative, or positive. within the method of text analytics, machine learning and tongue process techniques area unit combined to assign sentiment scores to the topics, entities, or classes among a phrase.

How will Sentiment Analysis Work?

Opposite to come up with sentence-based sentiment analysis systems, the Sentiment Analysis tool applies the sentiment to every topic in a very single sentence. the interior method follows the below steps:

Importance of NLP for businesses Sentiment analysis

First of all, a text is split into its primary elements, like sentences, entities, tokens, phrases.

Then, every topic and connected words area unit being known

Finally, in the end, a sentiment score is assigned to every and each topic, which has the -1, +4, 0…

A combination of tongue process and Machine Learning for Sentiment Analysis

The major role of machine learning techniques in sentiment analysis is to easily modify the text analytics functions that sentiment analysis depends on the POS tagging, segmentation, and entity extraction. for example, once the information scientists train any of the machine learning models by feeding it with an excellent variety of text documents containing pre-tagged examples, it’ll facilitate to mechanically notice the sentiment analysis in future perspective documents. this can be even potential because of each the supervised and unattended machine learning techniques like deep learning and neural networks.

Different set of Machine learning models and algorithms additionally facilitate knowledge analysts to unravel context-dependent issues that area unit being caused by the evolution of tongue process (NLP). for example, the adjective burned out may additionally bear some completely different meanings. Moreover, by merely considering the coaching ways as feeding machine learning models with scores of pre-tagged examples, the Machine learning systems will learn to know what burned out suggests that within the context of fireside versus within the context of work-life.

Some of the hybrid sentiment analysis systems wont to work at the side of the tongue process and machine learning to achieve higher accuracy. At now in time, it’s essential to create a distinction between machine learning and tongue process. While, a tongue processing-based sentiment analysis becomes economical|a good} and efficient tool to create a foundation for sentiment analysis and POS primarily based tagging. At constant time, machine learning techniques will facilitate to unravel a number of the difficult tongue process tasks, like understanding double meanings via automatic coaching.

A combination of tongue process and Machine learning techniques, thus, covers the whole text analytics method for the sentiment analysis, from the syntax analysis and low-level segmentation up to linguistics set of differentiation that chiefly depends on the context during which a word seems.

How Is Sentiment Analysis Used?

Sentiment analysis is usually used as a tool for the voice of staff and therefore the voice of consumers with a distinct set of functions and approaches. firms will use completely different style of sentiment analysis to urge to grasp however staff and purchasers feel concerning some basic topics and to find out the key reason for those thoughts and opinions. These helpful insights area unit then wont to enhance the worker or shopper expertise, that contributes to higher incomes and stronger productivity for the company:

2. Sentiment Analysis

Sentiment Analysis for client expertise

In today’s fashionable digital state of affairs, most of your customers area unit victimization social channels, chiefly Facebook,Instagram to speak and categorical their opinions concerning your product, brand, and services. Analyzing completely different tweets, news articles, and on-line reviews is extremely abundant helpful for business analysts or social media managers to urge a number of the helpful insights into however customers feel and even bear upon it afterwards. For this sort of task, automatic sentiment analysis plays a really significant factor as a language process tool.

Sentiment Analysis for worker expertise

A major share of the staff leave their jobs every year, whereas another portion is discharged or yield. during this sense, Human resource groups area unit commencing to take completely different actions, with the assistance of information analytics, to know such tendencies and cut back the turnover whereas yielding an excellent performance improvement. obtaining simply what staff area unit talking concerning and the way they feel concerning your company is feasible because of the sentiment analysis systems, and this helps the work force analysts to scale back worker churn.

Now, as we tend to aforementioned we’ll be making a Sentiment Analysis Model, however it’s easier aforementioned than done.

As we tend to humans communicate with one another in a very means that we tend to decision tongue that is simple for U.S.A. to interpret however it’s way more difficult and untidy if we actually look at it.

Because, there area unit billions of individuals and that they have their own kind of act, i.e. heaps of little variations area unit additional to the language and heaps of sentiments area unit connected to that that is simple for U.S.A. to interpret however it becomes a challenge for the machines.

This is why we want a method that creates the computers perceive the tongue as we tend to humans do, and this can be what we tend to decision tongue Processing(NLP). And, as we all know Sentiment Analysis could be a sub-field of natural language processing and with the assistance of machine learning techniques, it tries to spot and extract the insights.

Now, let’s get our hands dirty by implementing Sentiment Analysis, which can predict the sentiment of a given statement.

First, let’s import all the python libraries that we’ll use throughout the program.

Basic Python Libraries

  1. Pandas – library for knowledge analysis and knowledge manipulation
  2. Matplotlib – library used for knowledge visualisation
  3. Seaborn – a library supported matplotlib and it provides a high-level interface for knowledge visualisation
  4. WordCloud – library to ascertain text knowledge
  5. re – provides functions to pre-process the strings as per the given regular expression

Natural Language process

  1. nltk – tongue Toolkit could be a assortment of libraries for tongue process
  2. stopwords – a set of words that don’t give any assuming to a sentence
  3. WordNetLemmatizer – wont to convert completely different styles of words into one item however still keeping the context intact.

Scikit-Learn (Machine Learning Library for Python)


  1. CountVectorizer – remodel text to vectors
  2. GridSearchCV – for hyperparameter standardization
  3. RandomForestClassifier – machine learning formula for classification

Evaluation Metrics

  1. Accuracy Score – no. of properly classified instances/total no. of instances
  2. preciseness Score – the magnitude relation of properly foretold instances over total positive instances
  3. Recall Score – the magnitude relation of properly foretold instances over total instances therein category
  4. mythical creature Curve – a plot of true positive rate against false positive rate
  5. Classification Report – report of preciseness, recall and f1 score
  6. Confusion Matrix – a table wont to describe the classification models

We will use the dataset that is obtainable on Kaggle for sentiment analysis, that consists of a sentence and its individual sentiment as a target variable. This dataset contains three separate files named train.txt, test.txt and val.txt.

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