绘制RUL预测中的测试引擎预测表现

下图为C-MAPSS的4个数据子集测试集的所有发动机引擎的真实RUL与估计的RUL表现，并按照真实RUL值的大小从小到大排列。

# 导出预测rul和真实rul, pred为预测函数， model为训练后的NN模型
pred_rul, real_rul = pred(model, test_iter)
# 将pred_rul和real_rul拼接，以方便进行排序
rul = np.concatenate((pred_rul, real_rul), axis=1)
rul = rul[np.argsort(rul[:, 1])]
# 绘图
font_dict = dict(fontsize=12, color='k', family='Cambria', weight='light', style='normal')
plt.figure(figsize=(9, 7))
plt.plot(range(rul[:, 1].shape[0]), rul[:, 1], 'k-', label='Label Values')
plt.plot(range(rul[:, 0].shape[0]), rul[:, 0], 'r.-', label='Estimated Values')
plt.xlabel('Test Engine ID', loc='center', fontdict=font_dict)
plt.ylabel('RUL(Cycle)', loc='center', fontdict=font_dict)
plt.title(subDataset, fontdict=font_dict)
plt.legend()
plt.show()
savefig_path = 'root_path' + subDataset + '.svg' # set path of figures
plt.savefig(savefig_path)

pred函数可参考下列代码：

# pred()为RUL预测函数
def pred(model, test_iter):
    model.eval()
    outputs = []
    with torch.no_grad():
        for x, y in test_iter:
            predict_y = model(x)
            if outputs == []:
		#将原来在gpu上的数据搬到cpu上，并转化为numpy类型
                outputs = predict_y.cpu().numpy()
                real_y = y.cpu().numpy()
            else:
                predict_y = predict_y.cpu().numpy()
                y = y.cpu().numpy()
                outputs = np.concatenate((outputs, predict_y), axis=0)
                real_y = np.concatenate((real_y, y), axis=0)
    return outputs, real_y