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flowers_train.py

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+import os
+import numpy as np
+from PIL import Image
+import tensorflow as tf
+from tensorflow.keras import layers
+from tensorflow.keras.preprocessing.image import ImageDataGenerator
+from tensorflow.keras.layers import Conv2D, MaxPooling2D, Flatten, Dense, RandomFlip, RandomRotation, RandomZoom, Attention
+from tensorflow.keras.callbacks import ModelCheckpoint, EarlyStopping, Callback
+from sklearn.utils import class_weight
+
+
+# 数据路径
+data_dir = 'dataset/flowers'  # 数据集根目录
+batch_size = 32
+
+# 图片生成器，用于从文件夹加载图片数据
+datagen = ImageDataGenerator(
+    rescale=1./255,
+    validation_split=0.2,
+    rotation_range=10,
+    width_shift_range=0.2,
+    height_shift_range=0.2,
+    shear_range=0.15,
+    zoom_range=0.2,
+    horizontal_flip=True,
+)
+
+generator = datagen.flow_from_directory(
+    data_dir,
+    target_size=(180, 180),
+    batch_size=batch_size,
+    class_mode='categorical',
+    subset='training'
+)
+
+validation_generator = datagen.flow_from_directory(
+    data_dir,
+    target_size=(180, 180),
+    batch_size=batch_size,
+    class_mode='categorical',
+    subset='validation'
+)
+
+# 计算样本权重
+class_weights = class_weight.compute_sample_weight('balanced', generator.classes)
+
+# 配置早停
+early_stopping = EarlyStopping(monitor='val_loss', patience=3, verbose=1, restore_best_weights=True)
+
+# # 数据增强
+# data_augmentation = tf.keras.Sequential(
+#     [
+#         RandomFlip("horizontal", input_shape=(180, 180, 3)),
+#         RandomRotation(0.1),
+#         RandomZoom(0.1),
+#     ]
+# )
+
+# 配置GPU加速
+strategy = tf.distribute.MirroredStrategy()
+print('Number of devices: {}'.format(strategy.num_replicas_in_sync))
+
+with strategy.scope():
+    model = tf.keras.Sequential([
+        # data_augmentation,
+        Conv2D(32, (3, 3), padding='same', activation='relu', input_shape=(180, 180, 3)),
+        MaxPooling2D(),
+        Conv2D(64, (3, 3), padding='same', activation='relu'),
+        MaxPooling2D(),
+        Conv2D(128, (3, 3), padding='same', activation='relu'),
+        MaxPooling2D(),
+        Flatten(),
+        Dense(128, activation='relu'),
+        Dense(len(generator.class_indices), activation='softmax')
+    ])
+
+    # 编译模型
+    optimizer = tf.keras.optimizers.Adam(learning_rate=0.001)
+    model.compile(optimizer=optimizer, loss='categorical_crossentropy', metrics=['accuracy'])
+
+# # 配置模型检查点，保存最优模型
+# checkpoint_path = "./model/animal_model.h5"
+# model_checkpoint = ModelCheckpoint(checkpoint_path, monitor='val_loss',
+#                                      save_best_only=True, save_weights_only=False, verbose=1)
+
+# 训练模型
+model.fit(generator, epochs=20, validation_data=validation_generator, callbacks=[early_stopping])
+
+# 保存模型为 .h5 文件
+model.save("./model/flower_model.h5", save_format='h5')