Saurabh Srivastava


Complex Question Answering on knowledge graphs using machine translation and multi-task learning
Saurabh Srivastava | Mayur Patidar | Sudip Chowdhury | Puneet Agarwal | Indrajit Bhattacharya | Gautam Shroff
Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: Main Volume

Question answering (QA) over a knowledge graph (KG) is a task of answering a natural language (NL) query using the information stored in KG. In a real-world industrial setting, this involves addressing multiple challenges including entity linking, multi-hop reasoning over KG, etc. Traditional approaches handle these challenges in a modularized sequential manner where errors in one module lead to the accumulation of errors in downstream modules. Often these challenges are inter-related and the solutions to them can reinforce each other when handled simultaneously in an end-to-end learning setup. To this end, we propose a multi-task BERT based Neural Machine Translation (NMT) model to address these challenges. Through experimental analysis, we demonstrate the efficacy of our proposed approach on one publicly available and one proprietary dataset.


A Novel Hierarchical BERT Architecture for Sarcasm Detection
Himani Srivastava | Vaibhav Varshney | Surabhi Kumari | Saurabh Srivastava
Proceedings of the Second Workshop on Figurative Language Processing

Online discussion platforms are often flooded with opinions from users across the world on a variety of topics. Many such posts, comments, or utterances are often sarcastic in nature, i.e., the actual intent is hidden in the sentence and is different from its literal meaning, making the detection of such utterances challenging without additional context. In this paper, we propose a novel deep learning-based approach to detect whether an utterance is sarcastic or non-sarcastic by utilizing the given contexts ina hierarchical manner. We have used datasets from two online discussion platforms - Twitter and Reddit1for our experiments. Experimental and error analysis shows that the hierarchical models can make full use of history to obtain a better representation of contexts and thus, in turn, can outperform their sequential counterparts.


Detecting Aggression and Toxicity using a Multi Dimension Capsule Network
Saurabh Srivastava | Prerna Khurana
Proceedings of the Third Workshop on Abusive Language Online

In the era of social media, hate speech, trolling and verbal abuse have become a common issue. We present an approach to automatically classify such statements, using a new deep learning architecture. Our model comprises of a Multi Dimension Capsule Network that generates the representation of sentences which we use for classification. We further provide an analysis of our model’s interpretation of such statements. We compare the results of our model with state-of-art classification algorithms and demonstrate our model’s ability. It also has the capability to handle comments that are written in both Hindi and English, which are provided in the TRAC dataset. We also compare results on Kaggle’s Toxic comment classification dataset.


Identifying Aggression and Toxicity in Comments using Capsule Network
Saurabh Srivastava | Prerna Khurana | Vartika Tewari
Proceedings of the First Workshop on Trolling, Aggression and Cyberbullying (TRAC-2018)

Aggression and related activities like trolling, hate speech etc. involve toxic comments in various forms. These are common scenarios in today’s time and websites react by shutting down their comment sections. To tackle this, an algorithmic solution is preferred to human moderation which is slow and expensive. In this paper, we propose a single model capsule network with focal loss to achieve this task which is suitable for production environment. Our model achieves competitive results over other strong baseline methods, which show its effectiveness and that focal loss exhibits significant improvement in such cases where class imbalance is a regular issue. Additionally, we show that the problem of extensive data preprocessing, data augmentation can be tackled by capsule networks implicitly. We achieve an overall ROC AUC of 98.46 on Kaggle-toxic comment dataset and show that it beats other architectures by a good margin. As comments tend to be written in more than one language, and transliteration is a common problem, we further show that our model handles this effectively by applying our model on TRAC shared task dataset which contains comments in code-mixed Hindi-English.


Experiments with Domain Dependent Dialogue Act Classification using Open-Domain Dialogue Corpora
Swapnil Hingmire | Apoorv Shrivastava | Girish Palshikar | Saurabh Srivastava
Proceedings of the 14th International Conference on Natural Language Processing (ICON-2017)