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80 lines
2.8 KiB
80 lines
2.8 KiB
5 months ago
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import os
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import numpy as np
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from PIL import Image
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from tensorflow.keras.preprocessing.image import ImageDataGenerator
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from tensorflow.keras.models import Sequential
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from tensorflow.keras.layers import Conv2D, MaxPooling2D, Flatten, Dense
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import tensorflow as tf
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from tensorflow.keras.callbacks import Callback, EarlyStopping
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# 数据路径
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train_data_dir = 'dataset/scenery/seg_train'
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test_data_dir = 'dataset/scenery/seg_test'
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batch_size = 32
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# 图片生成器
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train_datagen = ImageDataGenerator(rescale=1./255)
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test_datagen = ImageDataGenerator(rescale=1./255)
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train_generator = train_datagen.flow_from_directory(
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train_data_dir,
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target_size=(180, 180),
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batch_size=batch_size,
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class_mode='categorical'
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)
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test_generator = test_datagen.flow_from_directory(
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test_data_dir,
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target_size=(180, 180),
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batch_size=batch_size,
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class_mode='categorical'
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)
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# 配置GPU加速
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strategy = tf.distribute.MirroredStrategy()
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print('Number of devices: {}'.format(strategy.num_replicas_in_sync))
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# 配置早停
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early_stopping = EarlyStopping(monitor='val_loss', patience=3, verbose=1, restore_best_weights=True)
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with strategy.scope():
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model = Sequential([
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Conv2D(32, (3, 3), activation='relu', input_shape=(180, 180, 3)),
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MaxPooling2D((2, 2)),
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Conv2D(64, (3, 3), activation='relu'),
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MaxPooling2D((2, 2)),
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Conv2D(128, (3, 3), activation='relu'),
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MaxPooling2D((2, 2)),
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Flatten(),
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Dense(128, activation='relu'),
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Dense(len(train_generator.class_indices), activation='softmax')
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])
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# 编译模型
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optimizer = tf.keras.optimizers.Adam(learning_rate=0.001)
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model.compile(optimizer=optimizer, loss='categorical_crossentropy', metrics=['accuracy'])
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# # 配置模型检查点，保存最优模型
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# checkpoint_path = "./model/animal_model.h5"
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# model_checkpoint = ModelCheckpoint(checkpoint_path, monitor='val_loss',
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# save_best_only=True, save_weights_only=False, verbose=1)
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# 训练模型
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model.fit(train_generator, epochs=10, validation_data=test_generator, callbacks=[early_stopping])
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# 保存模型为 .h5 文件
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model.save("./model/scenery_model.h5", save_format='h5')
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# model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy'])
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#
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# # 自定义回调函数，保存模型为 .h5 格式
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# class CustomModelCheckpoint(Callback):
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# def on_epoch_end(self, epoch, logs=None):
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# self.model.save("./model/scenery_model.h5")
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#
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# # 创建自定义回调函数实例
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# custom_checkpoint = CustomModelCheckpoint()
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#
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# # 训练模型时使用自定义回调函数
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# model.fit(train_generator, epochs=10, validation_data=test_generator, callbacks=[custom_checkpoint])
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