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用css把网站切片进行还原,网络软营销,学做网站记不住代码,网上服务系统🍨 本文为🔗365天深度学习训练营中的学习记录博客🍖 原作者：K同学啊数据集包含2149名患者的广泛健康信息，每名患者的ID范围从4751到6900不等。该数据集包括人口统计详细信息、生活方式因素、病史、临床测量、认知和功…

🍨 本文为🔗365天深度学习训练营中的学习记录博客
🍖 原作者：K同学啊

数据集包含2149名患者的广泛健康信息，每名患者的ID范围从4751到6900不等。该数据集包括人口统计详细信息、生活方式因素、病史、临床测量、认知和功能评估、症状以及阿尔兹海默症的诊断。

一、前期准备工作

1.设置硬件设备

import numpy as np
import pandas as pd
import torch
from torch import nn
import torch.nn.functional as F
import seaborn as sns#设置GPU训练，也可以使用CPU
device=torch.device("cuda" if torch.cuda.is_available() else "cpu")
print(device)

结果输出：

2.导入数据

df = pd.read_csv("alzheimers_disease_data.csv")
# 删除第一列和最后一列
df = df.iloc[:, 1:-1]
print(df)

结果输出：

二、构建数据集

1.标准化

#构建数据集
from sklearn.preprocessing import StandardScaler
from sklearn.model_selection import train_test_splitX = df.iloc[:,:-1]
y = df.iloc[:,-1]# 将每一列特征标准化为标准正太分布，注意，标准化是针对每一列而言的
sc = StandardScaler()
X  = sc.fit_transform(X)

2.划分数据集

#划分数据集
X = torch.tensor(np.array(X), dtype=torch.float32)
y = torch.tensor(np.array(y), dtype=torch.int64)X_train, X_test, y_train, y_test = train_test_split(X, y,test_size = 0.1,random_state = 1)print(X_train.shape, y_train.shape)

3.构建数据加载器

#构建数据加载器
from torch.utils.data import TensorDataset, DataLoadertrain_dl = DataLoader(TensorDataset(X_train, y_train),batch_size=64,shuffle=False)test_dl  = DataLoader(TensorDataset(X_test, y_test),batch_size=64,shuffle=False)

输出结果：

三、模型训练

1.构建模型

#构建模型
class model_rnn(nn.Module):def __init__(self):super(model_rnn, self).__init__()self.rnn0 = nn.RNN(input_size=32, hidden_size=200,num_layers=1, batch_first=True)self.fc0 = nn.Linear(200, 50)self.fc1 = nn.Linear(50, 2)def forward(self, x):out, hidden1 = self.rnn0(x)out = self.fc0(out)out = self.fc1(out)return outmodel = model_rnn().to(device)
print(model)

结果输出：

如何来看模型的输出数据集格式是什么？

#查看数据集输出格式是什么
print(model(torch.rand(30,32).to(device)).shape)

结果输出：

2.定义训练函数

# 训练循环
def train(dataloader, model, loss_fn, optimizer):size = len(dataloader.dataset)  # 训练集的大小num_batches = len(dataloader)   # 批次数目, (size/batch_size，向上取整)train_loss, train_acc = 0, 0  # 初始化训练损失和正确率for X, y in dataloader:  # 获取图片及其标签X, y = X.to(device), y.to(device)# 计算预测误差pred = model(X)          # 网络输出loss = loss_fn(pred, y)  # 计算网络输出和真实值之间的差距，targets为真实值，计算二者差值即为损失# 反向传播optimizer.zero_grad()  # grad属性归零loss.backward()        # 反向传播optimizer.step()       # 每一步自动更新# 记录acc与losstrain_acc  += (pred.argmax(1) == y).type(torch.float).sum().item()train_loss += loss.item()train_acc  /= sizetrain_loss /= num_batchesreturn train_acc, train_loss

3.定义测试函数

def test (dataloader, model, loss_fn):size        = len(dataloader.dataset)  # 测试集的大小num_batches = len(dataloader)          # 批次数目, (size/batch_size，向上取整)test_loss, test_acc = 0, 0# 当不进行训练时，停止梯度更新，节省计算内存消耗with torch.no_grad():for imgs, target in dataloader:imgs, target = imgs.to(device), target.to(device)# 计算losstarget_pred = model(imgs)loss        = loss_fn(target_pred, target)test_loss += loss.item()test_acc  += (target_pred.argmax(1) == target).type(torch.float).sum().item()test_acc  /= sizetest_loss /= num_batchesreturn test_acc, test_loss

4.正式训练模型

loss_fn    = nn.CrossEntropyLoss() # 创建损失函数
learn_rate = 5e-5   # 学习率
opt        = torch.optim.Adam(model.parameters(),lr=learn_rate)
epochs     = 50train_loss = []
train_acc  = []
test_loss  = []
test_acc   = []for epoch in range(epochs):model.train()epoch_train_acc, epoch_train_loss = train(train_dl, model, loss_fn, opt)model.eval()epoch_test_acc, epoch_test_loss = test(test_dl, model, loss_fn)train_acc.append(epoch_train_acc)train_loss.append(epoch_train_loss)test_acc.append(epoch_test_acc)test_loss.append(epoch_test_loss)# 获取当前的学习率lr = opt.state_dict()['param_groups'][0]['lr']template = ('Epoch:{:2d}, Train_acc:{:.1f}%, Train_loss:{:.3f}, Test_acc:{:.1f}%, Test_loss:{:.3f}, Lr:{:.2E}')print(template.format(epoch+1, epoch_train_acc*100, epoch_train_loss, epoch_test_acc*100, epoch_test_loss, lr))print("="*20, 'Done', "="*20)

输出结果：

四、模型评估

1.Loss与Accuracy图

import matplotlib.pyplot as plt
#隐藏警告
import warnings
warnings.filterwarnings("ignore")               #忽略警告信息
plt.rcParams['font.sans-serif']    = ['SimHei'] # 用来正常显示中文标签
plt.rcParams['axes.unicode_minus'] = False      # 用来正常显示负号
plt.rcParams['figure.dpi']         = 200        #分辨率from datetime import datetime
current_time = datetime.now() # 获取当前时间epochs_range = range(epochs)plt.figure(figsize=(12, 3))
plt.subplot(1, 2, 1)plt.plot(epochs_range, train_acc, label='Training Accuracy')
plt.plot(epochs_range, test_acc, label='Test Accuracy')
plt.legend(loc='lower right')
plt.title('Training and Validation Accuracy')
plt.xlabel(current_time) # 打卡请带上时间戳，否则代码截图无效plt.subplot(1, 2, 2)
plt.plot(epochs_range, train_loss, label='Training Loss')
plt.plot(epochs_range, test_loss, label='Test Loss')
plt.legend(loc='upper right')
plt.title('Training and Validation Loss')
plt.show()

输出结果：

2.混淆矩阵

print("=========输入数据Shape为=========")
print("X_test.shape: ", X_test.shape)
print("y_test.shape: ", y_test.shape)pred = model(X_test.to(device)).argmax(1).cpu().numpy()print("\n======输出数据Shape为 ======")
print("pred.shape: ",pred.shape)

import numpy as np
import matplotlib.pyplot as plt
from sklearn.metrics import confusion_matrix, ConfusionMatrixDisplay#计算混淆矩阵
cm = confusion_matrix(y_test, pred)plt.figure(figsize=(6,5))
plt.suptitle('')
sns.heatmap(cm, annot=True, fmt="d",cmap="Blues")#修改字体大小
plt.xticks(fontsize=10)
plt.yticks(fontsize=10)
plt.title("Confusion Matrix", fontsize=12)
plt.xlabel("Predicted Label",fontsize=10)
plt.ylabel("True Label", fontsize=10)#显示图
plt.tight_layout()
plt.show()

3.调用模型进行预测

text_X = X_test[0].reshape(1,-1)   #test[0]为输入数据pred = model(test_X.to(device)).argmax(1).item()
print("模型预测结果为：“,pred")
print("=="*20)
print("0:未患病")
print("1:已患病")