paddle深度学习基础之训练调试与优化

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paddle深度学习基础之训练调试与优化

前言

上一节咱们讨论了四种不同的优化算法，这一节，咱们讨论训练过程中的优化问题。本次代码修改模型全是在卷积神经网络

文章目录

网络结构

优化思路

计算分类准确率，观测模型训练效果
检查模型训练过程，通过输出训练过程中的某些参数或者中间结果，识别潜在问题
加入校验或测试，更好评价模型效果
加入正则化项，避免模型过拟合
可视化分析

一、计算模型的分类准确率

通过计算训练的准确度，能够比较直接的反应模型的精准程度。

在paddle框架中，我们可以使用自带的准确率计算方法：

fluit.layers.accuracy(prediction,lable)

第一个参数是预测值，第二个参数是实际标签值。下面是代码中需要修改的地方：

    def forward(self, inputs,label):
        conv1 = self.conv1(inputs)
        pool1 = self.pool1(conv1)
        conv2 = self.conb2(pool1)
        pool2 = self.pool2(conv2)
        pool2 = fluid.layers.reshape(pool2, [pool2.shape[0], -1])
        outputs = self.linear(pool2)
        if label is not None:#添加
            acc = fluid.layers.accuracy(input=outputs,label=label)#添加
            return outputs,acc
        else:
            return outputs

输出结果：

epoch: 0, batch: 0, loss is: [2.796657], acc is [0.04]
epoch: 0, batch: 200, loss is: [0.50403804], acc is [0.88]
epoch: 0, batch: 400, loss is: [0.2659506], acc is [0.92]
epoch: 1, batch: 0, loss is: [0.22079289], acc is [0.92]
epoch: 1, batch: 200, loss is: [0.23240374], acc is [0.92]
epoch: 1, batch: 400, loss is: [0.16370663], acc is [0.95]
epoch: 2, batch: 0, loss is: [0.37291032], acc is [0.92]
epoch: 2, batch: 200, loss is: [0.23772442], acc is [0.92]
epoch: 2, batch: 400, loss is: [0.18071894], acc is [0.95]
epoch: 3, batch: 0, loss is: [0.15938215], acc is [0.95]
epoch: 3, batch: 200, loss is: [0.21112804], acc is [0.92]
epoch: 3, batch: 400, loss is: [0.05794979], acc is [0.99]
epoch: 4, batch: 0, loss is: [0.24466723], acc is [0.93]
epoch: 4, batch: 200, loss is: [0.14045799], acc is [0.96]
epoch: 4, batch: 400, loss is: [0.12366832], acc is [0.94]

二、检查模型训练过程

在我们训练模型时，时常会出现结果和我们预期有很大差距。此时，我们就想了解训练过程中数据的变化过程。恰巧，paddle深度学习框架支持这些功能，我们一起去看看如何做的：

class MNIST(fluid.dygraph.Layer):
    def __init__(self):
        super(MNIST, self).__init__()
        # self.linear1 = Linear(input_dim=28*28,output_dim=10,act=None)
        # self.linear2 = Linear(input_dim=10,output_dim=10,act='sigmoid')
        # self.linear3 = Linear(input_dim=10,output_dim=1,act='sigmoid')
        self.conv1 = Conv2D(num_channels=1, num_filters=20, filter_size=5, stride=1, padding=2, act='relu')
        self.pool1 = Pool2D(pool_size=2, pool_stride=2, pool_type='max')
        self.conb2 = Conv2D(num_channels=20, num_filters=20, filter_size=5, stride=1, padding=2, act='relu')
        self.pool2 = Pool2D(pool_size=2, pool_stride=2, pool_type='max')
        self.linear = Linear(input_dim=980, output_dim=10, act='softmax')
    def forward(self, inputs,label,check_shape=False,check_content=False):
        conv1 = self.conv1(inputs)
        pool1 = self.pool1(conv1)
        conv2 = self.conb2(pool1)
        pool2 = self.pool2(conv2)
        pool21 = fluid.layers.reshape(pool2, [pool2.shape[0], -1])
        outputs = self.linear(pool21)
        # hidden1 = self.linear1(inputs)
        # hidden2 = self.linear2(hidden1)
        # outputs = self.linear3(hidden2)
        if(check_shape):
            print("\n------------打印各个层设置的网络超参数的尺寸 -------------")
            print("conv1-- kernel_size:{}, padding:{}, stride:{}".format(self.conv1.weight.shape, self.conv1._padding, self.conv1._stride))
            print("conv2-- kernel_size:{}, padding:{}, stride:{}".format(self.conv2.weight.shape, self.conv2._padding, self.conv2._stride))
            print("pool1-- pool_type:{}, pool_size:{}, pool_stride:{}".format(self.pool1._pool_type, self.pool1._pool_size, self.pool1._pool_stride))
            print("pool2-- pool_type:{}, poo2_size:{}, pool_stride:{}".format(self.pool2._pool_type, self.pool2._pool_size, self.pool2._pool_stride))
            print("liner-- weight_size:{}, bias_size_{}, activation:{}".format(self.fc.weight.shape, self.fc.bias.shape, self.fc._act))

            print("\n------------打印各个层的形状 -------------")
            print("inputs_shape: {}".format(inputs.shape))
            print("outputs1_shape: {}".format(conv1.shape))
            print("outputs2_shape: {}".format(pool1.shape))
            print("outputs3_shape: {}".format(conv2.shape))
            print("outputs4_shape: {}".format(pool2.shape))
            print("outputs5_shape: {}".format(outputs.shape))

        if check_content:
            # 打印卷积层的参数-卷积核权重，权重参数较多，此处只打印部分参数
            print("\n########## print convolution layer's kernel ###############")
            print("conv1 params -- kernel weights:", self.conv1.weight[0][0])
            print("conv2 params -- kernel weights:", self.conv2.weight[0][0])

            # 创建随机数，随机打印某一个通道的输出值
            idx1 = np.random.randint(0, conv1.shape[1])
            idx2 = np.random.randint(0, conv1.shape[1])
            # 打印卷积-池化后的结果，仅打印batch中第一个图像对应的特征
            print("\nThe {}th channel of conv1 layer: ".format(idx1), conv1[0][idx1])
            print("The {}th channel of conv2 layer: ".format(idx2), conv1[0][idx2])
            print("The output of last layer:", conv1[0], '\n')
        if label is not None:
            acc = fluid.layers.accuracy(input=outputs,label=label)
            return outputs,acc
        else:
            return outputs

输出结果：

------------打印各个层设置的网络超参数的尺寸 -------------
conv1-- kernel_size:[20, 1, 5, 5], padding:[2, 2], stride:[1, 1]
conv2-- kernel_size:[20, 20, 5, 5], padding:[2, 2], stride:[1, 1]
pool1-- pool_type:max, pool_size:[2, 2], pool_stride:[2, 2]
pool2-- pool_type:max, poo2_size:[2, 2], pool_stride:[2, 2]
liner-- weight_size:[980, 10], bias_size_[10], activation:softmax

------------打印各个层的形状 -------------
inputs_shape: [20, 1, 28, 28]
outputs1_shape: [20, 20, 28, 28]
outputs2_shape: [20, 20, 14, 14]
outputs3_shape: [20, 20, 14, 14]
outputs4_shape: [20, 20, 7, 7]
outputs5_shape: [20, 10]

三、加入校验或者测试，更好的评价模型

通常在我们获取数据集时，通常将数据集分成三个部分，分别是训练集，校验集，测试集。

训练集 ：用于训练模型的参数，即训练过程中主要完成的工作。
校验集 ：用于对模型超参数的选择，比如网络结构的调整、正则化项权重的选择等。
测试集 ：用于模拟模型在应用后的真实效果。因为测试集没有参与任何模型优化或参数训练的工作，所以它对模型来说是完全未知的样本。在不以校验数据优化网络结构或模型超参数时，校验数据和测试数据的效果是类似的，均更真实的反映模型效果。

四、加入正则化项，避免模型过拟合

过拟合现象

对于样本量有限、但需要使用强大模型的复杂任务，模型很容易出现过拟合的表现，即在训练集上的损失小，在验证集或测试集上的损失较大，如图2 所示。

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图2：过拟合现象，训练误差不断降低，但测试误差先降后增

反之，如果模型在训练集和测试集上均损失较大，则称为欠拟合。过拟合表示模型过于敏感，学习到了训练数据中的一些误差，而这些误差并不是真实的泛化规律（可推广到测试集上的规律）。欠拟合表示模型还不够强大，还没有很好的拟合已知的训练样本，更别提测试样本了。因为欠拟合情况容易观察和解决，只要训练loss不够好，就不断使用更强大的模型即可，因此实际中我们更需要处理好过拟合的问题。

导致过拟合原因

造成过拟合的原因是模型过于敏感，而训练数据量太少或其中的噪音太多。

如图3 所示，理想的回归模型是一条坡度较缓的抛物线，欠拟合的模型只拟合出一条直线，显然没有捕捉到真实的规律，但过拟合的模型拟合出存在很多拐点的抛物线，显然是过于敏感，也没有正确表达真实规律。

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图3：回归模型的过拟合，理想和欠拟合状态的表现

如图4 所示，理想的分类模型是一条半圆形的曲线，欠拟合用直线作为分类边界，显然没有捕捉到真实的边界，但过拟合的模型拟合出很扭曲的分类边界，虽然对所有的训练数据正确分类，但对一些较为个例的样本所做出的妥协，高概率不是真实的规律。

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图4：分类模型的欠拟合，理想和过拟合状态的表现

正则化项

前面咱们提到，过拟合现象就是因为模型过于复杂，对数据太敏感。所以，我们在无法获取更多数据时，只能降低模型的复杂度。

具体来说，在模型的优化目标（损失）中人为加入对参数规模的惩罚项。当参数越多或取值越大时，该惩罚项就越大。通过调整惩罚项的权重系数，可以使模型在“尽量减少训练损失”和“保持模型的泛化能力”之间取得平衡。泛化能力表示模型在没有见过的样本上依然有效。正则化项的存在，增加了模型在训练集上的损失。

代码实现

 optimizer = fluid.optimizer.AdamOptimizer(learning_rate=0.01, regularization=fluid.regularizer.L2Decay(regularization_coeff=0.1),
                                              parameter_list=model.parameters())

主要是通过这一句：

regularization=fluid.regularizer.L2Decay(regularization_coeff=0.1)

我们可以调节正则化项的权重，也就是regularization_coeff的值。

五、可视化库

训练模型时，经常需要观察模型的评价指标，分析模型的优化过程，以确保训练是有效的。可视化分析有两种工具：Matplotlib库和tb-paddle。

Matplotlib库：Matplotlib库是Python中使用的最多的2D图形绘图库，它有一套完全仿照MATLAB的函数形式的绘图接口，使用轻量级的PLT库（Matplotlib）作图是非常简单的。
tb-paddle：如果期望使用更加专业的作图工具，可以尝试tb-paddle。tb-paddle能够有效地展示飞桨框架在运行过程中的计算图、各种指标随着时间的变化趋势以及训练中使用到的数据信息。

Matplotlib 显示

通常，我们会把模型训练的的损失值和训练次数存进列表中，再通过matplotlib 相关函数进行可视化显示。

 if batch_id % 100 == 0:
                print("epoch: {}, batch: {}, loss is: {}, acc is {}".format(epoch_id, batch_id, avg_loss.numpy(), acc.numpy()))
                iters.append(iter)
                losses.append(avg_loss.numpy())
                iter = iter + 100

#画出训练过程中Loss的变化曲线
plt.figure()
plt.title("train loss", fontsize=24)
plt.xlabel("iter", fontsize=14)
plt.ylabel("loss", fontsize=14)
plt.plot(iters, losses,color='red',label='train loss') 
plt.grid()
plt.show()

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)]

tb-paddle

步骤1：引入tb_paddle库，定义作图数据存储位置（供第3步使用），本案例的路径是“log/data”。

from tb_paddle import SummaryWriter
data_writer = SummaryWriter(logdir="log/data")

步骤2：在训练过程中插入作图语句。当每100个batch训练完成后，将当前损失作为一个新增的数据点(scalar_x和loss的映射对)存储到第一步设置的文件中。使用变量scalar_x记录下已经训练的批次数，作为作图的X轴坐标。

data_writer.add_scalar("train/loss", avg_loss.numpy(), scalar_x)
data_writer.add_scalar("train/accuracy", avg_acc.numpy(), scalar_x)
scalar_x = scalar_x + 100

步骤3：命令行启动 tensorboard。

使用“tensorboard –logdir [数据文件所在文件夹路径] 的命令启动Tensor board。在Tensor board启动后，命令行会打印出可用浏览器查阅图形结果的网址。

$ tensorboard --logdir log/data

步骤4：打开浏览器，查看作图结果，如图6 所示。

查阅的网址在第三步的启动命令后会打印出来（如TensorBoard 2.0.0 at http://localhost:6006/），将该网址输入浏览器地址栏刷新页面的效果如下图所示。除了右侧对数据点的作图外，左侧还有一个控制板，可以调整诸多作图的细节。

注意：这里需要安装tensorboard，要不然无法打开这个这个。

令行会打印出可用浏览器查阅图形结果的网址。

$ tensorboard --logdir log/data

步骤4：打开浏览器，查看作图结果，如图6 所示。

注意：这里需要安装tensorboard，要不然无法打开这个这个。

发布者：全栈程序员-用户IM，转载请注明出处：https://javaforall.cn/196350.html原文链接：https://javaforall.cn

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paddle深度学习基础之训练调试与优化