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浙江电压等级电量/滚动预测.py

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+import numpy as np
+import pandas as pd
+import torch
+from torch import nn
+import os
+
+DAYS_FOR_TRAIN = 9
+
+class LSTM_Regression(nn.Module):
+
+    def __init__(self, input_size, hidden_size, output_size=1, num_layers=2):
+        super().__init__()
+
+        self.lstm = nn.LSTM(input_size, hidden_size, num_layers)
+        self.fc = nn.Linear(hidden_size, output_size)
+
+    def forward(self, _x):
+        x, _ = self.lstm(_x)  # _x is input, size (seq_len, batch, input_size)
+        s, b, h = x.shape  # x is output, size (seq_len, batch, hidden_size)
+        x = x.view(s * b, h)
+        x = self.fc(x)
+        x = x.view(s, b, -1)  # 把形状改回来
+        return x
+
+
+def create_dataset(data, days_for_train=5) -> (np.array, np.array):
+    dataset_x, dataset_y = [], []
+    for i in range(len(data) - days_for_train):
+        _x = data[i:(i + days_for_train)]
+        dataset_x.append(_x)
+        dataset_y.append(data[i + days_for_train])
+    return (np.array(dataset_x), np.array(dataset_y))
+
+
+if __name__ == '__main__':
+    data = pd.read_excel(r'C:\Users\鸽子\Desktop\浙江21年-23年行业以及分电压等级日电量.xlsx', sheet_name=1)
+
+    data.columns = data.columns.map(lambda x: x.strip())
+    data.sort_values(by='pt_date', ascending=True)
+    data['pt_date'] = pd.to_datetime(data['pt_date'], format='%Y%m%d', errors='coerce').astype('string')
+    data.set_index('pt_date', inplace=True)
+    data = data[(data.index.str[:6] != '202309') & (data.index.str[:6] != '202310')]
+    data.drop(columns=[i for i in data.columns if (data[i] == 0).sum() / len(data) >= 0.5], inplace=True)  # 去除0值列
+    print('len(data):', len(data))
+    for level in data.columns:
+        df = data[level]
+        df = df[df.values != 0]  # 去除0值行
+        df = df.astype('float32').values  # 转换数据类型
+
+        # 标准化到0~1
+        max_value = np.max(df)
+        min_value = np.min(df)
+        df = (df - min_value) / (max_value - min_value)
+
+        dataset_x, dataset_y = create_dataset(df, DAYS_FOR_TRAIN)
+        print('len(dataset_x:)', len(dataset_x))
+
+        # 划分训练集和测试集
+        train_size = len(dataset_x) - 31
+        train_x = dataset_x[:train_size]
+        train_y = dataset_y[:train_size]
+
+        # 将数据改变形状，RNN 读入的数据维度是 (seq_size, batch_size, feature_size)
+        train_x = train_x.reshape(-1, 1, DAYS_FOR_TRAIN)
+        train_y = train_y.reshape(-1, 1, 1)
+
+        # 转为pytorch的tensor对象
+        train_x = torch.from_numpy(train_x)
+        train_y = torch.from_numpy(train_y)
+
+        model = LSTM_Regression(DAYS_FOR_TRAIN, 32, output_size=1, num_layers=2)  # 导入模型并设置模型的参数输入输出层、隐藏层等
+
+
+        train_loss = []
+        loss_function = nn.MSELoss()
+        optimizer = torch.optim.Adam(model.parameters(), lr=0.001, betas=(0.9, 0.999), eps=1e-08, weight_decay=0)
+        for i in range(1200):
+            out = model(train_x)
+            loss = loss_function(out, train_y)
+            loss.backward()
+            optimizer.step()
+            optimizer.zero_grad()
+            train_loss.append(loss.item())
+
+        # 保存模型
+        # torch.save(model.state_dict(),save_filename)
+        # torch.save(model.state_dict(),os.path.join(model_save_dir,model_file))
+
+        # for test
+        model = model.eval()  # 转换成测试模式
+        # model.load_state_dict(torch.load(os.path.join(model_save_dir,model_file)))  # 读取参数
+
+        # 创建测试集
+        result_list = []
+        # 以x为基础实际数据，滚动预测未来3天
+        x = torch.from_numpy(df[-13:-4])
+        for i in range(3):
+            next_1_8 = x[1:]
+            next_9 = model(x.reshape(-1,1,DAYS_FOR_TRAIN))
+            # print(next_9,next_1_8)
+            x = torch.concatenate((next_1_8, next_9.view(-1)))
+            result_list.append(next_9.view(-1).item())
+        # print(result_list,len(result_list))
+
+        # 反归一化
+        pred = np.array(result_list) * (max_value - min_value) + min_value
+        df = df * (max_value - min_value) + min_value
+
+
+        # 打印指标
+        print(abs(pred - df[-3:]).mean() / df[-3:].mean())
+        result_eight = pd.DataFrame({'pred_test': pred, 'real': df[-3:]})
+        target = (result_eight['pred_test'].sum() - result_eight['real'].sum()) / df[-31:].sum()
+        print(target)
+        print(result_eight)
+        # with open(fr'C:\Users\鸽子\Desktop\各地市8月行业电量预测\{excel[:2]}.txt', 'a', encoding='utf-8') as f:
+        #     f.write(f'{excel[:2]}市{industry}行业月底偏差率:{round(target, 5)}\n')