code-switching

**Code-Switching** is the **linguistic phenomenon where a speaker alternates between two or more languages within a single conversation or sentence** ("I want to go to the *plage* because *il fait beau*") — a common feature of multilingual communication that poses challenges and opportunities for NLP. **NLP Context** - **Data**: Code-switched text is valuable for multilingual pre-training because it acts as a natural bridge between languages. - **Challenge**: Monolingual models fail completely on code-switched text. - **Synthetic**: Can generate synthetic code-switched data (randomly translating words) to improve multilingual alignment (Code-Switched Pre-training). **Why It Matters** - **Social Media**: Hinglish (Hindi-English), Spanglish (Spanish-English) are dominant on social platforms. - **Verification**: Tests if a model truly shares a semantic space (can it handle "The [dog] aboyé")? - **Alignment**: Synthetic code-switching is a powerful data augmentation technique for cross-lingual transfer. **Code-Switching** is **mixed-language speech** — natural or synthetic mixing of languages that serves as a bridge for aligning multilingual models.