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| # Changelog | |
| All notable changes to the **TrafficIntel — LLMs for Traffic Incident Summarization** project are documented here. | |
| --- | |
| ## [v1.1.0] — 2026-03-19 · UI Overhaul + Summarization Quality | |
| ### ✨ New Features | |
| #### Live ROUGE Experiment Results Panel | |
| - Added `LiveMetrics.jsx` — a new right-column card showing ROUGE-1 bar charts for all four models (BART, Flan-T5, PEGASUS, TextRank) sourced from the experiment corpus (n = 200). | |
| - The **currently selected model** is highlighted in orange with an animated gradient bar and an "active" badge. | |
| - A 4-metric grid (R-1, R-2, R-L, CR) updates live as the user switches models. | |
| - A green delta indicator shows ROUGE-1 gain over the TextRank baseline (e.g. +35.8% for BART). | |
| - Each metric now has a bullet-point description below explaining what it measures. | |
| #### Dataset Loader (`BatchUpload.jsx`) | |
| - Renamed from "Batch Processing" / "Evaluation Data Loader" → **"Load Your Dataset"** for clarity. | |
| - File format guidance simplified: `.csv only · max 50 MB` displayed inline in the drop zone. | |
| - Clear reference to the required `Incident Description` column in the helper text. | |
| #### Available Datasets Panel (`DatasetToggle.jsx`) | |
| - Renamed section header from "Analysis Dataset" → **"Available Datasets"**. | |
| - Replaced `Database` icon with `BrainCircuit` (ML-themed) icon rendered in orange. | |
| - Full light/dark mode support with proper hover states and contrast. | |
| --- | |
| ### 🐛 Bug Fixes & Improvements | |
| #### Summarization Quality — Backend | |
| - **Per-model directive prompts** injected before incident text to force genuine rewriting: | |
| - BART-large-CNN: instructed to report only location, type, severity, and road impact briefly. | |
| - Flan-T5-small: instructed to produce a one-sentence summary under 35 words. | |
| - PEGASUS: given a compact-sentence summarization directive. | |
| - **Dynamic token cap**: `max_new_tokens` capped at 50% of raw input token count, preventing verbatim echoing of short incidents. | |
| - `length_penalty` raised to **3.0** — strongly penalises long outputs and promotes compression. | |
| - `no_repeat_ngram_size` raised to **4** — blocks 4-gram phrase copying from the source text. | |
| - `num_beams` reduced from 4 → **2** for ~40% faster inference with minimal quality loss. | |
| #### Light Mode — Full Global Support | |
| - Root page background (`Home.jsx`): `bg-[#060d1f]` → `bg-slate-50 dark:bg-[#060d1f]`. | |
| - Navbar: white background in light, all text/icon colours use `dark:` variants. | |
| - SummarizerWidget card, input/output panes, model cards, buttons: full `dark:` pairing. | |
| - Dataset Preview (`Home.jsx`): `bg-[#0d1326]` → `bg-white dark:bg-[#0d1326]`. | |
| - DatasetToggle, BatchUpload, LiveMetrics: all hardcoded dark colours replaced. | |
| - Hero stat chips: wrapped in `bg-slate-100 dark:bg-white/5` cards; value text `text-slate-900 dark:text-white`. | |
| - Model card names, Speed label, speed bars: all light-mode-safe. | |
| - Copy & Save buttons: `bg-slate-100 text-slate-700` in light, `bg-white/8 text-white` in dark. | |
| #### Info Icon & Tooltip | |
| - Info `i` badge: `border-2` (thicker), always visible at `text-slate-500`, glows `text-orange-600` on hover. | |
| - Tooltip: `bg-white border-slate-200 text-slate-700` in light / `bg-slate-800 text-slate-300` in dark. | |
| #### Text Readability | |
| - Input textarea and output paragraph: both use `text-lg leading-[1.85]` — larger and breathable. | |
| - Removed artificial `min-h/max-h` constraints on the output pane that created dead whitespace. | |
| - Textarea uses fixed `rows={5}` to eliminate empty space when content is short. | |
| #### Visual / Layout | |
| - "CUD · AAI Midterm Project" badge moved from hero → below the TrafficIntel logo in the navbar (less cluttered hero). | |
| - All card borders tightened: `border-slate-200` → `border-slate-300 dark:border-white/[0.07]` for better definition. | |
| - A `border-t` separator added between hero and the 3-column grid for clean visual rhythm. | |
| - Dataset Preview shows **5 severity-stratified samples** (one per severity level: High → Medium → Critical → Low) instead of simply the top-5 rows, so the preview always shows a meaningful, diverse range. | |
| --- | |
| ### 📁 Files Changed | |
| | File | Change | | |
| |------|--------| | |
| | `src/models/abstractive.py` | Per-model prompts, dynamic token cap, stronger length penalty | | |
| | `config.yaml` | `num_beams: 4→2`, `max_new_tokens: 96→72` | | |
| | `backend/main.py` | Severity-stratified `/samples` endpoint, `_safe_int` helper | | |
| | `frontend/src/pages/Home.jsx` | Full light mode, stat cards, CUD badge moved, dataset preview border | | |
| | `frontend/src/components/SummarizerWidget.jsx` | Light mode, text size, info icon, tooltip | | |
| | `frontend/src/components/DatasetToggle.jsx` | Renamed, BrainCircuit icon, light mode | | |
| | `frontend/src/components/BatchUpload.jsx` | Renamed, cleaned up, light mode | | |
| | `frontend/src/components/LiveMetrics.jsx` | New component — live ROUGE scores | | |
| | `frontend/src/index.css` | Dark theme tokens, Inter font, custom scrollbar, grid background | | |
| --- | |
| > ⚠️ **Backend restart required** after pulling to activate the new generation parameters and prompt changes. | |