Manikandan R


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TeamDL at SemEval-2018 Task 8: Cybersecurity Text Analysis using Convolutional Neural Network and Conditional Random Fields
Manikandan R | Krishna Madgula | Snehanshu Saha
Proceedings of The 12th International Workshop on Semantic Evaluation

In this work we present our participation to SemEval-2018 Task 8 subtasks 1 & 2 respectively. We developed Convolution Neural Network system for malware sentence classification (subtask 1) and Conditional Random Fields system for malware token label prediction (subtask 2). We experimented with couple of word embedding strategies, feature sets and achieved competitive performance across the two subtasks. For subtask 1 We experimented with two category of word embeddings namely native embeddings and task specific embedding using Word2vec and Glove algorithms. 1. Native Embeddings: All words including the unknown ones that are randomly initialized use embeddings from original Word2vec/Glove models. 2. Task specific : The embeddings are generated by training Word2vec/Glove algorithms on sentences from MalwareTextDB We found that glove outperforms rest of embeddings for subtask 1. For subtask 2, we used N-grams of size 6, previous, next tokens and labels, features giving disjunctions of words anywhere in the left or right, word shape features, word lemma of current, previous and next words, word-tag pair features, POS tags, prefix and suffixes.


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Hitachi at SemEval-2017 Task 12: System for temporal information extraction from clinical notes
Sarath P R | Manikandan R | Yoshiki Niwa
Proceedings of the 11th International Workshop on Semantic Evaluation (SemEval-2017)

This paper describes the system developed for the task of temporal information extraction from clinical narratives in the context of the 2017 Clinical TempEval challenge. Clinical TempEval 2017 addressed the problem of temporal reasoning in the clinical domain by providing annotated clinical notes, pathology and radiology reports in line with Clinical TempEval challenges 2015/16, across two different evaluation phases focusing on cross domain adaptation. Our team focused on subtasks involving extractions of temporal spans and relations for which the developed systems showed average F-score of 0.45 and 0.47 across the two phases of evaluations.


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Hitachi at SemEval-2016 Task 12: A Hybrid Approach for Temporal Information Extraction from Clinical Notes
Sarath P R | Manikandan R | Yoshiki Niwa
Proceedings of the 10th International Workshop on Semantic Evaluation (SemEval-2016)