TaikoChartEstimator-20251228

TaikoChartEstimator

MIL-based Taiko chart difficulty estimator that predicts difficulty class and star rating from note charts. The model uses Transformer instance encoders, multi-branch attention MIL pooling, monotonic calibration, and multi-task losses (classification, censored regression, within-song ranking) with optional curriculum scheduling.

• Multi-instance learning over beat-aligned windows with stochastic top-k masking to avoid attention collapse
• Multi-task objectives with censored regression for boundary stars and ranking loss for within-song monotonicity
• Transformer instance encoder, multi-branch or gated attention aggregator, monotonic spline/MLP calibrator
• TensorBoard logging, curriculum scheduling, and HuggingFace checkpoints

Our goals are simple:

1. Star-Level Granularity: Move beyond traditional 1-10 integer star ratings to provide continuous sub-star difficulty scores (e.g., 9.3 vs 9.7), offering a more precise difficulty metric.
2. High-Difficulty Separation: Address "10-star inflation" by accurately tiering top-level charts, distinguishing between entry-level 10-star songs and those that significantly exceed the nominal boundary.
3. Sectional Interpretability: Provide section-by-section difficulty analysis to identify which specific segments contribute most to the overall rating, giving clear insights into the chart's complexity.