inputs = timeseries_dataset_from_array( np.expand_dims(data_array[:-forecast_horizon], axis=-1), None, sequence_length=input_sequence_length, shuffle=False, batch_size=batch_size, )
时间: 2023-04-06 16:03:31 浏览: 102
这是一个关于机器学习的问题,我可以回答。这段代码是用来创建时间序列数据集的,它从一个数组中获取数据,然后将其转换为一个时间序列数据集,以便用于机器学习模型的训练。其中,input_sequence_length 表示输入序列的长度,batch_size 表示批次大小。
相关问题
# 对训练集进行预测 train_preds = [] for i in range(len(train_dataset)): inputs, _ = train_dataset[i] inputs = inputs.unsqueeze(0) outputs = model(inputs) _, preds = torch.max(outputs, 1) train_preds.append(preds.item()) # 对验证集进行预测 val_preds = [] for i in range(len(val_dataset)): inputs, _ = val_dataset[i] inputs = inputs.unsqueeze(0) outputs = model(inputs) _, preds = torch.max(outputs, 1) val_preds.append(preds.item()) import numpy as np # 计算训练集准确率 train_labels = np.array([label for _, label in train_dataset]) train_acc = np.mean(np.array(train_preds) == train_labels) print('训练集准确率:{:.2f}%'.format(train_acc * 100)) # 计算验证集准确率 val_labels = np.array([label for _, label in val_dataset]) val_acc = np.mean(np.array(val_preds) == val_labels) print('验证集准确率:{:.2f}%'.format(val_acc * 100)),可以在这里添加一段拟合的过程吗
这段代码是对训练集和验证集使用训练好的模型进行预测,并计算准确率的过程。如果你想添加拟合过程,可以在这段代码之前先进行模型训练,例如:
```python
import torch
import torch.nn as nn
import torch.optim as optim
import torchvision.transforms as transforms
import torchvision.datasets as datasets
# 加载数据集
train_dataset = datasets.CIFAR10(root='./data', train=True, transform=transforms.ToTensor(), download=True)
val_dataset = datasets.CIFAR10(root='./data', train=False, transform=transforms.ToTensor(), download=True)
# 定义模型
class Net(nn.Module):
def __init__(self):
super(Net, self).__init__()
self.conv1 = nn.Conv2d(3, 32, kernel_size=3, padding=1)
self.conv2 = nn.Conv2d(32, 64, kernel_size=3, padding=1)
self.pool = nn.MaxPool2d(kernel_size=2, stride=2)
self.fc1 = nn.Linear(64 * 8 * 8, 128)
self.fc2 = nn.Linear(128, 10)
def forward(self, x):
x = self.pool(torch.relu(self.conv1(x)))
x = self.pool(torch.relu(self.conv2(x)))
x = x.view(-1, 64 * 8 * 8)
x = torch.relu(self.fc1(x))
x = self.fc2(x)
return x
# 初始化模型和优化器
model = Net()
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(model.parameters(), lr=0.001, momentum=0.9)
# 训练模型
for epoch in range(10):
running_loss = 0.0
for i, data in enumerate(train_dataset, 0):
inputs, labels = data
optimizer.zero_grad()
outputs = model(inputs)
loss = criterion(outputs, labels)
loss.backward()
optimizer.step()
running_loss += loss.item()
if i % 100 == 99:
print('[Epoch %d, Batch %d] loss: %.3f' % (epoch + 1, i + 1, running_loss / 100))
running_loss = 0.0
```
这段代码定义了一个简单的卷积神经网络模型,并使用CIFAR10数据集进行训练。你可以根据需要修改模型结构、训练次数、学习率等参数。在模型训练完成后,你可以使用之前的预测过程对训练集和验证集进行评估,计算准确率并输出。
def Predict(self, img): """ get class mask of image """ h_ori, w_ori = img.shape[:2] input_size = self.net.input_info["image"].input_data.shape h_resize, w_resize = input_size[-2:] img_pil = Image.fromarray(img) img_resize = img_pil.resize( (w_resize, h_resize), resample=BICUBIC) img_np = np.asarray(img_resize) / 255 # normalize # model input [1, 1, h, w] img_np = np.expand_dims(np.expand_dims(img_np, axis=0), axis=0) input = {'image': img_np} res = self.net.infer(inputs=input) output = res["mask"].squeeze(0) probs = softmax(output) mask = Image.fromarray(np.argmax(probs, axis=0).astype(np.uint8)) mask = mask.resize((w_ori, h_ori), resample=NEAREST) mask_np = np.asarray(mask) return mask_np
这段代码实现了一个神经网络模型对输入的图片进行分割(Semantic Segmentation),返回每个像素点所属的类别。具体来说,该方法的输入是一张图片(img),包含了该图片的高度(h_ori)和宽度(w_ori)。该方法首先将图片进行缩放以符合模型的输入要求(h_resize和w_resize),然后将像素值归一化到 [0, 1] 的范围内。接下来,将归一化后的图片转换为模型的输入格式([1, 1, h, w]),并进行推理,得到模型的输出(output)。然后,将输出进行 softmax 操作,并将每个像素点归类为概率最大的类别。最后,将归类后的结果进行缩放以符合原始图片的大小(h_ori和w_ori),并将其转换为 numpy 数组的形式,作为该方法的返回值(mask_np)。
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