iters_num = 10000 # 适当设定循环的次数 train_size = x_train.shape[0] batch_size = 100 learning_rate = 0.1 啥意思
时间: 2024-04-08 14:30:36 浏览: 102
这段代码定义了一些变量,用于控制神经网络的训练过程。
```python
iters_num = 10000 # 适当设定循环的次数
train_size = x_train.shape[0]
batch_size = 100
learning_rate = 0.1
```
- `iters_num`表示训练循环的总次数。在这个例子中,循环将重复进行10000次。
- `train_size`表示训练数据集的样本数量。这个值通常通过查看训练数据集的形状(`x_train.shape[0]`)来获取。
- `batch_size`表示每个训练批次中包含的样本数量。在这个例子中,每个批次将包含100个样本。
- `learning_rate`表示训练过程中使用的学习率。学习率决定了每次更新模型参数时的步长大小。在这个例子中,学习率被设置为0.1。
这些变量的具体取值可以根据问题的需求和实际情况进行调整。其中,`iters_num`和`learning_rate`通常需要进行调参来优化训练过程和模型性能。
相关问题
import idx2numpy import numpy as np from functions import * from two_layer_network import * #导入训练集和训练集对应的标签并将其初始化 X_train,T_train=idx2numpy.convert_from_file('emnist/emnist-letters-train-images-idx3-ubyte'),idx2numpy.convert_from_file('emnist/emnist-letters-train-labels-idx1-ubyte') X_train,T_train=X_train.copy(),T_train.copy() X_train=X_train.reshape((X_train.shape[0],-1)) T_train=T_train-1 T_train=np.eye(26)[T_train] #导入测试集和测试集对应的标签标签并将其初始化 X_test,T_test=idx2numpy.convert_from_file('emnist/emnist-letters-test-images-idx3-ubyte'),idx2numpy.convert_from_file('emnist/emnist-letters-test-labels-idx1-ubyte') X_test,T_test=X_test.copy(),T_test.copy() X_test=X_test.reshape((X_test.shape[0],-1)) T_test=T_test-1 T_test=np.eye(26)[T_test] network=TwoLayerNet(input_size=784,hidden_size=45,output_size=26) train_size=X_train.shape[0] batch_size=100 iters_num=100000 learning_rate=0.01 train_loss_list=[] train_acc_list=[] test_acc_list=[] iter_per_epoch=max(train_size/batch_size,1) for i in range(iters_num): batch_mask=np.random.choice(train_size,batch_size) X_batch=X_train[batch_mask] T_batch=T_train[batch_mask] #从数据集里抽取batch_size笔数据 #grad=network.numerical_gradient(X_batch,T_batch)(跑不出来,卡在None None) grad=network.gradient(X_batch,T_batch) #计算梯度 for key in ('W1','b1','W2','b2') : network.params[key]-=learning_rate*grad[key] #误差反向传播法调整参数 loss=network.loss(X_batch,T_batch) train_loss_list.append(loss) #记录学习过程 if i % iter_per_epoch==0: train_acc=network.accuracy(X_train,T_train) test_acc=network.accuracy(X_test,T_test) train_acc_list.append(train_acc) test_acc_list.append(test_acc) print(train_acc,test_acc) #调整学习率 if i > 0 and i % 1000 == 0 and i<3000: learning_rate *= 0.1 print("learning rate reduced to " + str(learning_rate)) print(network.params) print(train_acc_list[-1],test_acc_list[-1])如果我想存储参数,该怎么做
如果想要存储参数,可以使用Python内置的pickle模块。具体步骤如下:
1. 在代码中加入以下代码,将训练后的参数保存到文件中:
```
import pickle
with open("params.pkl", "wb") as f:
pickle.dump(network.params, f)
```
其中,"params.pkl"是你想要存储参数的文件名,network.params是你的神经网络的参数。
2. 在需要使用训练后的参数进行预测时,可以通过以下代码从文件中读取参数:
```
import pickle
with open("params.pkl", "rb") as f:
params = pickle.load(f)
network.params = params
```
其中,params是从文件中读取到的参数,将其赋给network.params即可。
return data, label def __len__(self): return len(self.data)train_dataset = MyDataset(train, y[:split_boundary].values, time_steps, output_steps, target_index)test_ds = MyDataset(test, y[split_boundary:].values, time_steps, output_steps, target_index)class MyLSTMModel(nn.Module): def __init__(self): super(MyLSTMModel, self).__init__() self.rnn = nn.LSTM(input_dim, 16, 1, batch_first=True) self.flatten = nn.Flatten() self.fc1 = nn.Linear(16 * time_steps, 120) self.relu = nn.PReLU() self.fc2 = nn.Linear(120, output_steps) def forward(self, input): out, (h, c) = self.rnn(input) out = self.flatten(out) out = self.fc1(out) out = self.relu(out) out = self.fc2(out) return outepoch_num = 50batch_size = 128learning_rate = 0.001def train(): print('训练开始') model = MyLSTMModel() model.train() opt = optim.Adam(model.parameters(), lr=learning_rate) mse_loss = nn.MSELoss() data_reader = DataLoader(train_dataset, batch_size=batch_size, drop_last=True) history_loss = [] iter_epoch = [] for epoch in range(epoch_num): for data, label in data_reader: # 验证数据和标签的形状是否满足期望,如果不满足,则跳过这个批次 if data.shape[0] != batch_size or label.shape[0] != batch_size: continue train_ds = data.float() train_lb = label.float() out = model(train_ds) avg_loss = mse_loss(out, train_lb) avg_loss.backward() opt.step() opt.zero_grad() print('epoch {}, loss {}'.format(epoch, avg_loss.item())) iter_epoch.append(epoch) history_loss.append(avg_loss.item()) plt.plot(iter_epoch, history_loss, label='loss') plt.legend() plt.xlabel('iters') plt.ylabel('Loss') plt.show() torch.save(model.state_dict(), 'model_1')train()param_dict = torch.load('model_1')model = MyLSTMModel()model.load_state_dict(param_dict)model.eval()data_reader1 = DataLoader(test_ds, batch_size=batch_size, drop_last=True)res = []res1 = []# 在模型预测时,label 的处理for data, label in data_reader1: data = data.float() label = label.float() out = model(data) res.extend(out.detach().numpy().reshape(data.shape[0]).tolist()) res1.extend(label.numpy().tolist()) # 由于预测一步,所以无需 reshape,直接转为 list 即可title = "t321"plt.title(title, fontsize=24)plt.xlabel("time", fontsize=14)plt.ylabel("irr", fontsize=14)plt.plot(res, color='g', label='predict')plt.plot(res1, color='red', label='real')plt.legend()plt.grid()plt.show()的运算过程
这段代码是用 PyTorch 实现的一个 LSTM 模型,用于时间序列预测。首先定义了一个自定义的数据集类 MyDataset,用于加载训练数据和测试数据。然后定义了一个包含 LSTM 层的 MyLSTMModel 模型,并在 train 函数中使用 DataLoader 加载训练数据集,采用 Adam 优化器和 MSE 损失函数进行训练。训练过程中记录了每个 epoch 的损失值,并在训练结束后保存了模型参数。最后,使用加载的模型参数对测试数据进行预测,并将预测结果和真实值可视化展示出来。
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