algorithm_platform/models_processing/model_tf/tf_transformer.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @FileName  :tf_transformer.py
# @Time      :2025/5/08 14:03
# @Author    :David
# @Company: shenyang JY

from tensorflow.keras.layers import Input, Dense, LSTM, concatenate, Conv1D, Conv2D, MaxPooling1D, Reshape, Flatten, LayerNormalization, Dropout
from tensorflow.keras.models import Model, load_model
from tensorflow.keras.callbacks import ModelCheckpoint, EarlyStopping, TensorBoard, ReduceLROnPlateau
from tensorflow.keras import optimizers, regularizers
from models_processing.model_tf.losses import region_loss
import numpy as np
from common.database_dml import *
from models_processing.model_tf.settings import set_deterministic
from threading import Lock
import argparse
model_lock = Lock()
set_deterministic(42)

class TransformerHandler(object):
    def __init__(self, logger, args):
        self.logger = logger
        self.opt = argparse.Namespace(**args)
        self.model = None
        self.model_params = None

    def get_model(self, args):
        """
        单例模式+线程锁，防止在异步加载时引发线程安全
        """
        try:
            with model_lock:
                loss = region_loss(self.opt)
                self.model, self.model_params = get_keras_model_from_mongo(args, {type(loss).__name__: loss})
        except Exception as e:
            self.logger.info("加载模型权重失败:{}".format(e.args))

    @staticmethod
    def get_transformer_model(opt, time_series=1):
        time_steps = 48
        input_features = 21
        output_steps = 16
        hidden_size = opt.Model.get('hidden_size', 64)
        num_heads = opt.Model.get('num_heads', 4)
        ff_dim = opt.Model.get('ff_dim', 128)
        l2_reg = regularizers.l2(opt.Model.get('lambda_value_2', 0.0))

        nwp_input = Input(shape=(opt.Model['time_step'] * time_series, opt.Model['input_size']), name='nwp')

        # 输入嵌入
        x = Conv1D(hidden_size, 1, kernel_regularizer=l2_reg)(nwp_input)

        # Transformer编码器层
        for _ in range(opt.Model.get('num_layers', 2)):
            # 多头自注意力
            x = tf.keras.layers.MultiHeadAttention(
                num_heads=num_heads, key_dim=hidden_size,
                kernel_regularizer=l2_reg
            )(x, x)
            x = LayerNormalization()(x)
            x = tf.keras.layers.Dropout(0.1)(x)

            # 前馈网络
            x = tf.keras.layers.Dense(ff_dim, activation='relu', kernel_regularizer=l2_reg)(x)
            x = tf.keras.layers.Dense(hidden_size, kernel_regularizer=l2_reg)(x)
            x = LayerNormalization()(x)
            x = tf.keras.layers.Dropout(0.1)(x)

        # 提取中间时间步
        start_idx = (time_steps - output_steps) // 2
        x = x[:, start_idx:start_idx + output_steps, :]

        # 输出层
        output = Dense(output_steps, name='cdq_output')(x[:, -1, :])  # 或者使用所有时间步

        model = Model(nwp_input, output)

        # 编译模型
        adam = optimizers.Adam(
            learning_rate=opt.Model.get('learning_rate', 0.001),
            beta_1=0.9, beta_2=0.999, epsilon=1e-7, amsgrad=True
        )
        loss = region_loss(opt)
        model.compile(loss=loss, optimizer=adam)

        return model

    def train_init(self):
        try:
            # 进行加强训练，支持修模
            loss = region_loss(self.opt)
            base_train_model, self.model_params = get_keras_model_from_mongo(vars(self.opt), {type(loss).__name__: loss})
            base_train_model.summary()
            self.logger.info("已加载加强训练基础模型")
            return base_train_model
        except Exception as e:
            self.logger.info("加载加强训练模型权重失败:{}".format(e.args))
            return False

    def training(self, model, train_and_valid_data):
        model.summary()
        train_x, train_y, valid_x, valid_y = train_and_valid_data
        early_stop = EarlyStopping(monitor='val_loss', patience=self.opt.Model['patience'], mode='auto')
        history = model.fit(train_x, train_y, batch_size=self.opt.Model['batch_size'], epochs=self.opt.Model['epoch'],
                            verbose=2, validation_data=(valid_x, valid_y), callbacks=[early_stop], shuffle=False)
        loss = np.round(history.history['loss'], decimals=5)
        val_loss = np.round(history.history['val_loss'], decimals=5)
        self.logger.info("-----模型训练经过{}轮迭代-----".format(len(loss)))
        self.logger.info("训练集损失函数为：{}".format(loss))
        self.logger.info("验证集损失函数为：{}".format(val_loss))
        return model

    def predict(self, test_x, batch_size=1):
        result = self.model.predict(test_x, batch_size=batch_size)
        self.logger.info("执行预测方法")
        return result



if __name__ == "__main__":
    run_code = 0