網格搜尋

# Possible max depth values
max_depth_grid = [____]
results = {}

# For each value in the grid
for max_depth_candidate in max_depth_grid:
    # Specify parameters for the model
    params = {'max_depth': ____}

    # Calculate validation score for a particular hyperparameter
    validation_score = get_cv_score(train, params)

    # Save the results for each max depth value
    results[max_depth_candidate] = validation_score   
print(results)