🔗 Links & Resources
- GitHub Repository: https://github.com/MmdDevAi/qa-parsbert
- Hugging Face Model Card: https://huggingface.co/Msoldier-ai/parsbert-qa
- Interactive Web Demo (Hugging Face Spaces): https://huggingface.co/spaces/Msoldier-ai/parsbert-qa-and-samsum
📚 Intelligent Document Question Answering & RAG System
An end-to-end Question Answering (QA) and Retrieval-Augmented Generation (RAG) system designed for accurate, context-aware information extraction from complex documents. This repository covers both extractive QA architectures (DistilBERT, RoBERTa) and modern RAG pipelines using LangChain.
🌟 Highlights & Key Features
- Extractive QA Baseline: Fast inference and high token-level precision using fine-tuned DistilBERT and RoBERTa models.
- Retrieval-Augmented Generation (RAG): Integrated retrieval pipeline powered by LangChain for contextual grounding and hallucination reduction.
- Document Ingestion & Chunking: Efficient parsing and semantic chunking for dense text and technical documentation.
- Evaluation Framework: Benchmarked against standard QA metrics (Exact Match and F1-Score).
🏗️ Architecture & Model Progression
Extractive Pipeline (DistilBERT / RoBERTa):
- Identifies the start and end logits directly from the source passage.
- Ideal for low-latency, strictly factual question answering where answers are verbatim in the context.
RAG Pipeline (LangChain Integration):
- Uses vector embeddings and similarity search to retrieve relevant document chunks dynamically.
- Synthesizes answers over large multi-page documents without exceeding model context limits.
📊 Quantitative Evaluation & Results
The system was evaluated on the PQuAD (Persian Question Answering Dataset) benchmark using standard reading comprehension metrics (Exact Match and F1-Score).
Benchmark Performance
| Model Architecture | Dataset | Exact Match (EM) | F1 Score | Notes |
|---|---|---|---|---|
| ParsBERT (Fine-Tuned) | PQuAD | 73.47% | 86.28% | Optimized for Persian extractive QA |
Detailed Breakdown (HasAns vs. NoAns)
To evaluate real-world robustness against unanswerable or ambiguous queries, performance is broken down by answer availability:
| Question Type | Exact Match (EM) | F1 Score | Description |
|---|---|---|---|
| HasAns (Answerable) | 71.8% | 84.6% | Context contains the explicit answer span |
| NoAns (Unanswerable) | 75.2% | 88.0% | Correctly abstaining / detecting missing answers |
Error Categorization Analysis
Error patterns on the validation set fall into three primary failure modes:
- Span Boundary Mismatch: The model locates the correct sentence but includes extraneous context tokens or truncates dependent clauses.
- False Negatives: The model predicts no answer when a subtle or implicit answer exists within the text.
- False Positives: The model predicts an entity or phrase from the context when the question actually lacks sufficient evidence to be answered.
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