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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 4408 Suicide Text Detection using Machine Learning Tanmay Khopkar1, Akshay Khane2, Prathamesh Dhumal3 , Mrs. Snehal R. Shinde4 1, 2, 3Department of Computer Engineering, Pillai HOC College of Engineering and Technology, Rasayani, Maharashtra, India. 4Assistant Professor Snehal R. Shinde, Department of Computer Engineering, Pillai HOC College of Engineering and Technology, Rasayani, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Social media network like twitter is a communication channel which enables it’s users to broadcast their thoughts through brief text updates. Different people have different thoughts which theyoftenpostonTwitter. Close to 800,000 people commit suicide everyyear, whichis1person every 40 seconds. Vulnerable accounts, usually post about their depressive situations on social media via twitter prior to act. Raw but useful data is available on social media, these account’s social media activity can be observed by mining the data using different Machine Learning techniques. Convolutional Neural Network has been used to classify the text in these raw data. This result, to the best of our knowledge, has the best performance for classifyingdatafrom social media. Key Words: Text Classification, Machine Learning, CNN, Social Media, Suicide. 1. INTRODUCTION Social media is a type ofonlineintercommunicationplatform that allow its users to share differentkindsofmedia publicly. The media can be in the form of photos, videos, text messages, etc. There are different types of social media platforms that are very popular. Twitter is one of the social media platforms that is used by millions of people. Initially, Twitter only allowed sharing of texts called as ‘Tweets”, but, it now also allows photos and videos to be shared. Twitter can be used in many ways by its users for e.g. advertising products, sharingthoughts,sharing information about a campaign, an event etc. Twitter is generally used by its users for sharing theirthoughts.People usually share their personal, political, professional thoughts onto the platform. Due to the rise of internet usage, number of people using the internet has drastically increased over time. As a result, the number of people using social media, as in our case, Twitter, has also increased and so is the content on social media. People share their opinions, feelings,thoughtsetc. on Twitter. Feeling or emotions shared by the users can bedepressive or joyful. The publisher of the depressive text can either be just sharing his/hers feeling or it can be a cry for help. In an extreme case, the user can be suicidal i.e. likely to commit suicide. Our aim is to detect such extreme cases of suicidal individuals using their tweets they post onto Twitter. 2. RELATED WORK Large amount of studies have been done on recognisingthe suicidal tendency of an individual in many fields like medical fields using the resting-state of the heart rate, psychology using the thoughts and feeling of the individual. Machine learning fields alsohavebeenusedtoresearchand determine the suicidal tendency of an individual using the content that individual posts on the social media. Text Classification method of machine learning is used to determine the suicidal tendency. Besides N-gram features, knowledge based features, syntactic features, models for cyber suicide detection also used regression analysis ANN and CRF. Mulholland and Quinnextractedthevocabularyand verbal features to determine the suicidal or non-suicidal sentences. Huang et al. built a psychological lexicon dictionary and used a SVM classifier. [11]Chatopadhyay proposed a mathematical feed-forward multilayer neural network. [9]Delgado-Gomez et al and [9]Pestian et al. compared the performance of different multivariate complexity techniques. 3. METHODOLOGY 3.1 Pre-Processing Data pre-processing is a process that converts the raw, real-life data in an understandable format. The data in the raw form is often incomplete and isn’tunderstandable.So, in order to process the data and get the results that we desire, we need to perform data pre-processing on the raw data set so that actual results can be obtained. The dataset that we have contains 5 columns, namely,id’s, date, flag, user and tweet. But, among these columns we are only concerned with the tweet column, so, we drop all the columns except tweetscolumn.Thetweetsarenotpresentin only text format. The tweets contain special characters, hyperlinks, numbers and punctuations. We need to remove all of these and converts the contents of the column in a normalised form.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 4409 Fig -1: Data Pre-processing After removing all the special characters, hyperlinks, numbers and punctuations, we now remove the connectors or stopwords for the tweets. The next step is tokenization, i.e. after the connectors have been removed, we need tosplit the string that is tweet in our case into a listtokens.Fromthe tokens that we have now, there may be multiple tokens that are different forms of same word, so we use Porters stemmers from nltk library. After this, we separate the tokens into positive and negative words and visualize them using the Wordcloud. From the dataset, we visualize the words in 3 different groups, namely a) Words that are most commonly used in the tweets, b) Positive words that are most commonlyusedin the tweets, and c) Negative words that are most commonly used in the tweets. 3.2 Classification Classification is the process of clubbing different objects with same properties into classes, in our case, based on the positive and negative words, determining the tweets is suicidal or non-suicidal. Among all of the classifiers present, we use Convolutional Neural Network (CNN) for classifying the tweets into suicidal or non-suicidal. Fig -2: Convolutional Neural Network (CNN) Classifier Neural word embedding have become popular for modelling the individual wordsandtheinteractionsbetween them. It is used to serve various purposes like text classification. It uses distributedword representationwhere a single word isn’t represented by a single neurons but a word is represented by numerous neurons. This helps the distributed representation system learn about the general concepts of language and not just the independent word representations. The most commonlyusedwordembedding system was developed by Google called as Word2Vec which uses two neural network architectures namely, a) Continuous Bag of Words (CBoW) and, b) Skip-Gram (SG) The Google Word2Vec basically converts the words into vectors using some pre-defined formula.Itcanevenperform vectorization even for the unknown words. After the vectorization of the text is done, the two main processes for classifying the sentence, the tweet in our case are, a) Convolutional FilterorKarnel-Theprocessinwhich a filter is applied on the vectorised values of the words using a sliding window of a pre-defined size and the new vectors are generated. b) Pooling- The process of sampling the new vectors created by applying the convolutional filter and combining them by taking the maximum or the average value. Once the vectorization of the words and then sampling of the vectors is done, the vectors values are then given a inputs to the neurons of the Convolutional Neural Network (CNN). The are appropriately weighted and given to the neurons for processing. Rectified LinearUnit(ReLU)isgiven as activation functions to the neurons. Based on the inputs, the weights assigned to the inputs and the activation function assigned to the neurons,the network segregatesthe inputs into classes. 4. CONCLUSIONS Our systems elaborated based on real time Twitter data. Among many widely used text classification models, based on this study CNN suicidal detection model shows better performance. This model shows better optimization on iterative solutions. This system is primarily focuses on suicidal people by mining the databasesystemsothattweets related to suicide will get detected. FUTURE SCOPE When our system detects the real time suicidal text we can make the program evaluate in such a way that we can find the geographical location of that particular tweet.There are many NGO’s and anti suicidal organizations work against suicide.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 4410 we can inform these NGO’s about such accounts so as to take further appropriate action. This system is not only can be implemented on Twitter but also other social media platforms like Facebook, Instagram, and WhatsApp. REFERENCES [1] Glen Coppersmith, Mark Dredze, Craig Harman, and Kristy Hollingshead. 2015a. From ADHD to SAD: Analyzing the Language of Mental Health on Twitter through Self-Reported Diagnoses. In Computational Linguistics and Clinical Psychology, pages 1– 10M. Young, The Technical Writer’s Handbook. Mill Valley, CA: University Science, 1989. [2] American Psychiatric Association. 2013. Diagnostic and statistical manual of mental disorders (5th ed.), 5 edition. American PsychiatricPublishing, Washington.K. Elissa, “Title of paper if known,” unpublished. [3] Depression and Other Common Mental Disorders: Global Health Estimates. World Health Organization, 2017. [4] BasicstructureaboutCNNWikipedia//en.wikipedia.org/wiki/ Convolutionalneuralnetwork. [5] E. Okhapkina, V. Okhapkin, and O. Kazarin, “Adaptation of information retrieval methods for identifying of destructive informational influence in social networks,” in 2017 31st International Conference on Advanced Information Networking and Applications Workshops (WAINA), pp. 87–92, Taipei, Taiwan, 2017, IEEE. [6] M. Mulholland and J. Quinn, “Suicidal tendencies: the automatic classification of suicidal and non-suicidal lyricists using NLP,” in Proceedings of the Sixth International Joint Conference on Natural Language Processing, pp. 680–684, Nagoya, Japan, 2013. [7] X. Huang, L. Zhang, D. Chiu, T. Liu, X. Li, and T.Zhu, “Detecting suicidal ideation in Chinese microblogs with psychological lexicons, “in 2014 IEEE 11th Intl Conf on Ubiquitous Intelligence and Computing and 2014 IEEE 11th Intl Conf on Autonomic and Trusted Computing and 2014 IEEE 14th Intl Conf onScalableComputingand Communications and Its Associated Workshops, pp. 844–849, Bali, Indonesia, 2014, IEEE [8] J. Pestian, H. Nasrallah, P. Matykiewicz, A. Bennett, and A. Leenaars, “Suicide note classification using natural language processing: a content analysis,” Biomedical Informatics Insights, vol. 3, pp. 19–28, 2010. [9] D. Delgado-Gomez, H. Blasco-Fontecilla, F. Sukno, M. Socorro Ramos-Plasencia, and E. Baca-Garcia, “Suicide attempters classification: toward predictive models of suicidal behavior,” Neurocomputing,vol.92,pp.3–8,2012. [10] Research Article Based on ”Supervised Learningfor Suicidal Ideation Detection in Online User Content” by Shaoxiong Ji, Celina Ping Yu, Sai-fu Fung, Shirui Pan,and Guodong Long. [11] S. Chattopadhyay,“Astudyonsuicidal risk analysis,” in 2007 9th International Conference on e-Health Networking, Application and Services,pp.74–78, Taipei, Taiwan, 2007, IEEE.
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