utils.py 文件源码

def plot_bias_variance(data_sizes, train_errors, test_errors, name, title):
    pylab.figure(num=None, figsize=(6, 5))
    pylab.ylim([0.0, 1.0])
    pylab.xlabel('Data set size')
    pylab.ylabel('Error')
    pylab.title("Bias-Variance for '%s'" % name)
    pylab.plot(
        data_sizes, test_errors, "--", data_sizes, train_errors, "b-", lw=1)
    pylab.legend(["test error", "train error"], loc="upper right")
    pylab.grid(True, linestyle='-', color='0.75')
    pylab.savefig(
        os.path.join(CHART_DIR, "bv_" + name.replace(" ", "_") + ".png"), bbox_inches="tight")