//! # NLP Evaluation Metrics and Online LDA
//!
//! This module provides standard NLP evaluation metrics for machine translation
//! and text summarization, along with online topic modeling.
//!
//! ## Metrics
//!
//! - **BLEU** (Bilingual Evaluation Understudy): Measures n-gram precision of
//! generated text against reference translations (Papineni et al. 2002).
//! - **ROUGE** (Recall-Oriented Understudy for Gisting Evaluation): Measures
//! n-gram recall for summarization evaluation.
//! - **METEOR** (Metric for Evaluation of Translation with Explicit ORdering):
//! Alignment-based metric with stemming and synonym matching.
//!
//! ## Topic Modeling
//!
//! - **Online LDA**: Streaming Latent Dirichlet Allocation using stochastic
//! variational inference (Hoffman et al. 2010).
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