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008			251217b ||||| |||| 00| 0 eng d
041			_aengtag
050			_aQA76.9 A73 S47 2025
082			_2.
100	1		_a Servo, Samantha Vivien I.; Inso, Kelly Denise A.
245			_aModified support vector machine algorithm for text classification applied psychiatric tele-triage
264		1	_a. _b. _cc2525
300			_bUndergraduate Thesis: (Bachelor of Science Computer Science) - Pamantasan ng Lungsod ng Maynila, 2025
336			_2text _atext _btext
337			_2unmediated _aunmediated _bunmediated
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505			_aABSTRACT: This study investigates the use of Support Vector Machine (SVM) models to enhance text classification for tele-triage in psychiatry. The issue addressed is SVM’s tendency to ignore significant textual features, which results in low precision and recall, particularly in multi-class classification tasks with imbalanced classes. In order to address this, the researchers propose generating embeddings using the Large Language Model (LLM) RoBERTa, then reducing the dimensionality using PCA before training the SVM model. The dataset includes 500 Reddit posts with five categories of suicide risk: Attempt, Behavior, Ideation, Indicator and Supportive. Experts used the Columbia Suicide Severity Rating Scale (C-SSRS) to sort these posts. Results slow significant improvement over the baseline SVM model. The model initially had trouble with recall and precision, especially for the Attempt class, which had zero precision. Significant were observed in the Supportive class (precision: 0.55 to 0.59, recall: 0.43 to 0.57) and Behavior (precision: 0.25 to 0.31, recall: 0.13 to 0.27) following the implementation of the RoBERTa-based strategy. Even though the attempt demonstrated some improvement (precision: 0.00 to 0.33), more optimization is required. These results suggest that incorporating RoBERTa embeddings and PCA for dimensionality reduction can enhance SVM’s performance by preventing the loss of important features. The model still has issues with minority classes, suggesting that more research is needed to enhance recall for underrepresented categories and handle class imbalances.
526			_aF
655			_aacademic writing
942			_2lcc _cMS
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