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FSRS-6 spaced repetition, spreading activation, synaptic tagging, hippocampal indexing, and 130 years of memory research. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
//! FSRS-6 (Free Spaced Repetition Scheduler) Module
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//!
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//! The state-of-the-art spaced repetition algorithm (2025-2026).
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//! 20-30% more efficient than SM-2 (Anki's original algorithm).
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//!
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//! Reference: https://github.com/open-spaced-repetition/fsrs4anki
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//!
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//! ## Key improvements in FSRS-6 over FSRS-5:
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//! - 21 parameters (vs 19) with personalizable forgetting curve decay (w20)
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//! - Same-day review handling with S^(-w19) term
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//! - Better short-term memory modeling
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//!
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//! ## Core Formulas:
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//! - Retrievability: R = (1 + FACTOR * t / S)^(-w20) where FACTOR = 0.9^(-1/w20) - 1
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//! - Interval: t = S/FACTOR * (R^(1/w20) - 1)
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mod algorithm;
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mod optimizer;
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mod scheduler;
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pub use algorithm::{
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apply_sentiment_boost,
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fuzz_interval,
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initial_difficulty,
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initial_difficulty_with_weights,
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initial_stability,
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initial_stability_with_weights,
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next_difficulty,
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next_difficulty_with_weights,
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next_forget_stability,
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next_forget_stability_with_weights,
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next_interval,
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next_interval_with_decay,
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next_recall_stability,
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next_recall_stability_with_weights,
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// Core functions
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retrievability,
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retrievability_with_decay,
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same_day_stability,
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same_day_stability_with_weights,
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DEFAULT_DECAY,
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DEFAULT_RETENTION,
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// Constants
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FSRS6_WEIGHTS,
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MAX_DIFFICULTY,
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MAX_STABILITY,
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MIN_DIFFICULTY,
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MIN_STABILITY,
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};
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pub use scheduler::{
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FSRSParameters, FSRSScheduler, FSRSState, LearningState, PreviewResults, Rating, ReviewResult,
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};
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pub use optimizer::FSRSOptimizer;
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