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# function to get grid for visualisation.

def get_grid_2D(data, eps=0.01):
    x_min, x_max = data[:, 0].min() - 1, data[:, 0].max() + 1
    y_min, y_max = data[:, 1].min() - 1, data[:, 1].max() + 1
    return np.meshgrid(np.arange(x_min, x_max, eps),
                         np.arange(y_min, y_max, eps))