Upload best_hyperparameters.json

Best hyperparameters added from previous run.

best_hyperparameters.json

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+{"lr": 0.00042840029987674996, "momentum": 0.899203238087435, "weight_decay": 2.830545737226652e-05, "epochs": 10, "epsilon_range": [0.001, 0.25, 0.005]}