PromptMemory

Context masking in NoMemory-RASP increased regret, indicating that retrieval encoded cross-regime structure. PromptMemory stores context keys, historical best parameters, and learnable soft prompts. PromptMemory retrieves the three nearest memory entries by Euclidean distance and converts negative distances into softmax weights. Retrieved prompts and historical bests are weighted averages of the selected memory entries. PromptMemory can create privacy risks because it may store context vectors and parameter traces tied to users or infrastructure.