Fig. 3. Average relative mean squared error (RMSE) where , and nLB = 5. Each graph presents the average RMSE with a different setting of nUB. The optimal k values are 3.3, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, and 3.8 from the left-top to the right-bottom.
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