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pytorch_model.py

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+# ANN model
+
+import torch
+import numpy as np
+import pandas as pd
+import torch.nn as nn
+import torch.optim as optim
+from torch.utils.data import DataLoader
+from torch.utils.data.dataset import Dataset
+import matplotlib.pyplot as plt
+import os
+import torch.nn.functional as F
+from torchvision import datasets, transforms
+from tqdm import tqdm
+
+device = torch.device('cuda:0')
+learning_rate = 0.01
+train_ratio = 0.7
+BATCH_SIZE = 10
+epochs = 10
+
+
+# data set
+class CarDataset(Dataset):
+    def __init__(self, csv_path, mode):
+        self.data = pd.read_csv(csv_path) # ../是打开上级目录的文件，获取当前目录 path1 = os.path.abspath('.')
+        self.mode = mode
+        sep = int(train_ratio * len(self.data))
+        if self.mode == 'train':
+            self.inp = torch.tensor(self.data.iloc[:sep, :21].values.astype(np.float32))
+            self.oup = torch.tensor(self.data.iloc[:sep, 21:].values.astype(np.float32))
+        else:
+            self.inp = torch.tensor(self.data.iloc[sep:, :21].values.astype(np.float32))
+            self.oup = torch.tensor(self.data.iloc[sep:, 21:].values.astype(np.float32))
+
+    def __len__(self):
+        return len(self.inp)
+
+    def __getitem__(self, idx):
+        return self.inp[idx], self.oup[idx]
+
+        # inpt = torch.Tensor(self.inp[idx])
+        # oupt = torch.Tensor(self.oup[idx])
+        # return {'inp': inpt,
+        #         'oup': oupt,
+        #         }
+
+
+dataset_train = CarDataset("car_onehot.csv", mode = 'train')
+dataset_test = CarDataset("car_onehot.csv", mode = 'test')
+data_train = DataLoader(dataset_train, batch_size=BATCH_SIZE, shuffle=True)
+print(data_train)
+data_test = DataLoader(dataset_test, batch_size=BATCH_SIZE, shuffle=True)
+
+print(data_test)
+
+# define net
+class Net(nn.Module):
+
+    def __init__(self):
+        super(Net, self).__init__()
+
+        self.model = nn.Sequential(
+            nn.Linear(21, 50),
+            nn.ReLU(inplace=True),
+            nn.Linear(50, 50),
+            nn.ReLU(inplace=True),
+            nn.Linear(50, 4),
+            nn.ReLU(inplace=True),
+        )
+
+    def forward(self, x):
+        x = self.model(x)
+
+        return x
+
+
+net = Net()   #.to(device)
+optimizer = optim.SGD(net.parameters(), lr=learning_rate)
+m = nn.Softmax(dim=1)
+criterion = nn.MSELoss()
+
+
+for epoch in range(epochs):
+    for batch_idx,(data, target) in enumerate(data_train):
+        output = net(data)
+        output1 = m(output)
+        loss = criterion(output1, target)
+        optimizer.zero_grad()
+        loss.backward()
+        optimizer.step()
+
+
+        if batch_idx % 10 == 0:
+            print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(
+                epoch, batch_idx * BATCH_SIZE, len(data_train),
+                       100. * batch_idx / len(data_train), loss.item()))
+
+
+    test_loss = 0
+    correct = 0
+    for batch_idx, (data, target) in enumerate(data_test):
+        output = net(data)
+        output1 = m(output)
+        # print(output.size())
+        test_loss += criterion(output1, target)
+
+        # test_loss += criterion(logits, oup).item()
+        # pred = output.data.max(1)[1]
+        # print(target.data.size())
+        # print(pred.size())
+        # correct += pred.eq(target.data).sum()
+        # only loss is calculated in this case
+
+    test_loss /= len(data_test.dataset)    # calculate average loss
+    print('\nTest set: Average loss: {:.4f}\n'.format(test_loss))
+