Explanation: This is a machine learning practical project (with data + code + documentation + video explanation ). If you need data + code + documentation + video explanation, you can go directly to the end of the article to get it.
1. Project background
The LSTM network is currently a more general cyclic neural network structure. Its full name is Long Short-Term Memory, which is translated into Chinese as "long'short-term memory'" network. When reading, there should be a pause after "long", and don't read it as "long and short", because in that case, you don't know whether the memory is long or short. In essence, it is still a short-memory network, but in some way the "short-memory" is extended as much as possible.
This project implements the recurrent neural network regression model based on PyTorch.
2. Data Acquisition
The modeling data for this time comes from the Internet (compiled by the author of this project), and the statistics of the data items are as follows:
The data details are as follows (partial display):
3. Data preprocessing
3.1 View data with Pandas tool
Use the head() method of the Pandas tool to view the first five rows of data:
key code:
3.2 Data missing view
Use the info() method of the Pandas tool to view data information:
As can be seen from the figure above, there are a total of 11 variables, no missing values in the data, and a total of 2000 data.
key code:
3.3 Data descriptive statistics
Use the describe() method of the Pandas tool to view the mean, standard deviation, minimum, quantile, and maximum of the data.
The key code is as follows:
4. Exploratory Data Analysis
4.1 Histogram of y variables
Use the hist() method of the Matplotlib tool to draw a histogram:
As can be seen from the figure above, the y variable is mainly concentrated between -400 and 400.
4.2 Correlation analysis
As can be seen from the figure above, the larger the value, the stronger the correlation. A positive value is a positive correlation, and a negative value is a negative correlation.
5. Feature engineering
5.1 Establish feature data and label data
The key code is as follows:
5.2 Dataset splitting
Use the train_test_split() method to divide according to 80% training set and 20% test set. The key code is as follows:
6. Build a recurrent neural network regression model
The LSTM regression algorithm is mainly used for target regression.
6.1 Building a model
7. Model Evaluation
7.1 Evaluation indicators and results
The evaluation indicators mainly include explainable variance value, mean absolute error, mean square error, R square value and so on.
It can be seen from the above table that the R square is 0.9871, which is a good model.
The key code is as follows:
7.2 Comparison chart of actual value and predicted value
From the above figure, it can be seen that the fluctuations of the actual value and the predicted value are basically the same, and the model fitting effect is good.
8. Conclusion and Outlook
In summary, this paper implements the recurrent neural network regression model based on PyTorch, and finally proves that the model we proposed works well. This model can be used for forecasting of everyday products.
# 定义训练函数
def train(model, train_loader, criterion, optimizer, device):
model.train() # 设置训练模式
for i, (inputs, labels) in enumerate(train_loader): # 进行循环
inputs, labels = inputs.to(device), labels.to(device) # 输入数据、标签数据
optimizer.zero_grad() # 清空过往梯度
本次机器学习项目实战所需的资料，项目资源如下：
项目说明：
链接：https://pan.baidu.com/s/1dW3S1a6KGdUHK90W-lmA4w
提取码：bcbp
# y变量分布直方图
fig = plt.figure(figsize=(8, 5)) # 设置画布大小
plt.rcParams['font.sans-serif'] = 'SimHei' # 设置中文显示
plt.rcParams['axes.unicode_minus'] = False # 解决保存图像是负号'-'显示为方块的问题
data_tmp = df['y'] # 过滤出y变量的样本
# 绘制直方图 bins：控制直方图中的区间个数 auto为自动填充个数 color：指定柱子的填充色
plt.hist(data_tmp, bins='auto', color='g')For more project practice, see the list of machine learning project practice collections:
List of actual combat collections of machine learning projects