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Rotary Position Embedding (RoPE) is a technique that encodes positional information in transformers by rotating query and key vectors. Unlike earlier approaches that mixed position and semantic information, RoPE applies different rotation angles based on token distance and hidden state dimensions. Tokens closer together receive minimal rotation and attend with higher weights, while distant tokens undergo larger rotations. The technique processes dimensions in pairs with varying rotation angles, allowing models to learn both short-range dependencies (like adjectives modifying nearby nouns) and long-range dependencies (like variable references in code). This approach preserves semantic information, enables flexible sequence lengths through closed-form equations, and ensures attention weights decrease as relative distances increase.

RoPE, Clearly Explained