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Represents the type of autotuning algorithm to use.
DEFAULT: The default behavior is implementation specific and may change over time.
HILL_CLIMB: In each optimization step, this algorithm chooses the optimial parameter and increases its value by 1.
GRADIENT_DESCENT: In each optimization step, this algorithm updates the parameter values in the optimal direction.
MAX_PARALLELISM: Similar to HILL_CLIMB but uses a relaxed stopping condition, allowing the optimization to oversubscribe the CPU.