early stop用在train,test还是val
时间: 2024-05-24 21:11:18 浏览: 17
Early stopping is typically used during training to monitor the validation set and stop training when the validation loss stops improving. Therefore, early stopping is used on the validation set.
相关问题
# (5)划分训练集和验证集 # 窗口为20条数据,预测下一时刻 history_size = 20 target_size = 0 # 训练集 x_train, y_train = database(inputs_feature.values, 0, train_num, history_size, target_size) # 验证集 x_val, y_val = database(inputs_feature.values, train_num, val_num, history_size, target_size) # 测试集 x_test, y_test = database(inputs_feature.values, val_num, None, history_size, target_size) # 查看数据信息 print('x_train.shape:', x_train.shape) # x_train.shape: (109125, 20, 1) # (6)构造tf数据集 # 训练集 train_ds = tf.data.Dataset.from_tensor_slices((x_train, y_train)) train_ds = train_ds.shuffle(10000).batch(128) # 验证集 val_ds = tf.data.Dataset.from_tensor_slices((x_val, y_val)) val_ds = val_ds.batch(128) # 查看数据信息 sample = next(iter(train_ds)) print('x_batch.shape:', sample[0].shape, 'y_batch.shape:', sample[1].shape) print('input_shape:', sample[0].shape[-2:]) # x_batch.shape: (128, 20, 1) y_batch.shape: (128,) # input_shape: (20, 1) inputs = keras.Input(shape=sample[0].shape[-2:]) x = keras.layers.LSTM(16, return_sequences=True)(inputs) x = keras.layers.Dropout(0.2)(x) x = keras.layers.LSTM(8)(x) x = keras.layers.Activation('relu')(x) outputs = keras.layers.Dense(1)(x) model = keras.Model(inputs, outputs) model.summary() opt = keras.optimizers.RMSprop(learning_rate=0.001, rho=0.9) model.compile(optimizer=opt, loss='mae', metrics=['mae']) # (9)模型训练 epochs = 100 early_stop = EarlyStopping(monitor='val_loss', patience=5, verbose=1) # 训练模型,并使用 EarlyStopping 回调函数 history = model.fit(train_ds, epochs=epochs, validation_data=val_ds, callbacks=[early_stop]) # (12)预测 y_predict = model.predict(x_test)# 对测试集的特征值进行预测 print(y_predict)详细说说该模型
该模型是一个基于 LSTM 的时序预测模型,用于预测下一时刻的数据。首先,在数据预处理中,使用了窗口为20条数据的方式来构建训练集、验证集和测试集。在模型的构建中,输入的数据形状为(20, 1),经过一个LSTM层,再经过一个Dropout层,再经过一个LSTM层和一个激活函数层,最终输出一个Dense层,输出维度为1,即预测下一时刻的数据。在模型的编译中,使用了RMSprop优化器和MAE损失函数,并且监控了MAE指标。在模型的训练中,使用了EarlyStopping回调函数来防止过拟合,并且训练了100个epoch。最后,在模型的预测中,对测试集的特征值进行预测,并输出预测结果。
取前90%个数据作为训练集 train_num = int(len(data) * 0.90) # 90%-99.8%用于验证 val_num = int(len(data) * 0.998) # 最后1%用于测试 inputs_feature = temp # (5)划分训练集和验证集 # 窗口为20条数据,预测下一时刻 history_size = 20 target_size = 0 # 训练集 x_train, y_train = database(inputs_feature.values, 0, train_num, history_size, target_size) # 验证集 x_val, y_val = database(inputs_feature.values, train_num, val_num, history_size, target_size) # 测试集 x_test, y_test = database(inputs_feature.values, val_num, None, history_size, target_size) # 查看数据信息 print('x_train.shape:', x_train.shape) # x_train.shape: (109125, 20, 1) # (6)构造tf数据集 # 训练集 train_ds = tf.data.Dataset.from_tensor_slices((x_train, y_train)) train_ds = train_ds.shuffle(10000).batch(128) # 验证集 val_ds = tf.data.Dataset.from_tensor_slices((x_val, y_val)) val_ds = val_ds.batch(128) # 查看数据信息 sample = next(iter(train_ds)) print('x_batch.shape:', sample[0].shape, 'y_batch.shape:', sample[1].shape) print('input_shape:', sample[0].shape[-2:]) # x_batch.shape: (128, 20, 1) y_batch.shape: (128,) # input_shape: (20, 1) inputs = keras.Input(shape=sample[0].shape[-2:]) x = keras.layers.LSTM(16, return_sequences=True)(inputs) x = keras.layers.Dropout(0.2)(x) x = keras.layers.LSTM(8)(x) x = keras.layers.Activation('relu')(x) outputs = keras.layers.Dense(1)(x) model = keras.Model(inputs, outputs) model.summary() opt = keras.optimizers.RMSprop(learning_rate=0.001, rho=0.9) model.compile(optimizer=opt, loss='mae', metrics=['mae']) # (9)模型训练 epochs = 100 early_stop = EarlyStopping(monitor='val_loss', patience=5, verbose=1) # 训练模型,并使用 EarlyStopping 回调函数 history = model.fit(train_ds, epochs=epochs, validation_data=val_ds, callbacks=[early_stop]) # (12)预测 y_predict = model.predict(x_test)# 对测试集的特征值进行预测 print(y_predict)详细说说该模型
这段代码实现了一个基于LSTM神经网络的时间序列预测模型。具体来说,该模型将输入的时间序列数据分成窗口大小为20的小块,每个小块作为一个样本输入到模型中进行训练。模型的输出是预测下一个时间步的数值。该模型的架构包含了两层LSTM,第一层的输出被传递给第二层作为输入,第二层的输出被送到一个全连接层进行处理,最终输出预测结果。在模型训练过程中,使用了RMSprop优化器和Mean Absolute Error(MAE)作为损失函数,模型训练过程中还使用了EarlyStopping回调函数来防止过拟合。最后,该模型被用于对测试集的特征值进行预测。