TensorFlow训练网络的方式有哪些

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TensorFlow训练网络有两种方式，一种是基于tensor(array)，另外一种是迭代器

两种方式区别是：

• 第一种是要加载全部数据形成一个tensor，然后调用model.fit()然后指定参数batch_size进行将所有数据进行分批训练

• 第二种是自己先将数据分批形成一个迭代器，然后遍历这个迭代器，分别训练每个批次的数据

方式一：通过迭代器

IMAGE_SIZE = 1000# step1:加载数据集(train_images, train_labels), (val_images, val_labels) = tf.keras.datasets.mnist.load_data()# step2:将图像归一化train_images, val_images = train_images / 255.0, val_images / 255.0# step3:设置训练集大小train_images = train_images[:IMAGE_SIZE]val_images = val_images[:IMAGE_SIZE]train_labels = train_labels[:IMAGE_SIZE]val_labels = val_labels[:IMAGE_SIZE]# step4:将图像的维度变为(IMAGE_SIZE,28,28,1)train_images = tf.expand_dims(train_images, axis=3)val_images = tf.expand_dims(val_images, axis=3)# step5:将图像的尺寸变为(32,32)train_images = tf.image.resize(train_images, [32, 32])val_images = tf.image.resize(val_images, [32, 32])# step6:将数据变为迭代器train_loader = tf.data.Dataset.from_tensor_slices((train_images, train_labels)).batch(32)val_loader = tf.data.Dataset.from_tensor_slices((val_images, val_labels)).batch(IMAGE_SIZE)# step5:导入模型model = LeNet5()# 让模型知道输入数据的形式model.build(input_shape=(1, 32, 32, 1))# 结局Output Shape为 multiplemodel.call(Input(shape=(32, 32, 1)))# step6:编译模型model.compile(optimizer='adam',              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),              metrics=['accuracy'])# 权重保存路径checkpoint_path = "./weight/cp.ckpt"# 回调函数，用户保存权重save_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_path,                                                   save_best_only=True,                                                   save_weights_only=True,                                                   monitor='val_loss',                                                   verbose=0)EPOCHS = 11for epoch in range(1, EPOCHS):    # 每个批次训练集误差    train_epoch_loss_avg = tf.keras.metrics.Mean()    # 每个批次训练集精度    train_epoch_accuracy = tf.keras.metrics.SparseCategoricalAccuracy()    # 每个批次验证集误差    val_epoch_loss_avg = tf.keras.metrics.Mean()    # 每个批次验证集精度    val_epoch_accuracy = tf.keras.metrics.SparseCategoricalAccuracy()    for x, y in train_loader:        history = model.fit(x,                            y,                            validation_data=val_loader,                            callbacks=[save_callback],                            verbose=0)        # 更新误差，保留上次        train_epoch_loss_avg.update_state(history.history['loss'][0])        # 更新精度，保留上次        train_epoch_accuracy.update_state(y, model(x, training=True))        val_epoch_loss_avg.update_state(history.history['val_loss'][0])        val_epoch_accuracy.update_state(next(iter(val_loader))[1], model(next(iter(val_loader))[0], training=True))    # 使用.result()计算每个批次的误差和精度结果    print("Epoch {:d}: trainLoss: {:.3f}, trainAccuracy: {:.3%} valLoss: {:.3f}, valAccuracy: {:.3%}".format(epoch,                                                                                                             train_epoch_loss_avg.result(),                                                                                                             train_epoch_accuracy.result(),                                                                                                             val_epoch_loss_avg.result(),                                                                                                             val_epoch_accuracy.result()))

方式二：适用model.fit()进行分批训练

import model_sequential(train_images, train_labels), (test_images, test_labels) = tf.keras.datasets.mnist.load_data()# step2:将图像归一化train_images, test_images = train_images / 255.0, test_images / 255.0# step3:将图像的维度变为(60000,28,28,1)train_images = tf.expand_dims(train_images, axis=3)test_images = tf.expand_dims(test_images, axis=3)# step4:将图像尺寸改为(60000,32,32,1)train_images = tf.image.resize(train_images, [32, 32])test_images = tf.image.resize(test_images, [32, 32])# step5:导入模型# history = LeNet5()history = model_sequential.LeNet()# 让模型知道输入数据的形式history.build(input_shape=(1, 32, 32, 1))# history(tf.zeros([1, 32, 32, 1]))# 结局Output Shape为 multiplehistory.call(Input(shape=(32, 32, 1)))history.summary()# step6:编译模型history.compile(optimizer='adam',                loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),                metrics=['accuracy'])# 权重保存路径checkpoint_path = "./weight/cp.ckpt"# 回调函数，用户保存权重save_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_path,                                                   save_best_only=True,                                                   save_weights_only=True,                                                   monitor='val_loss',                                                   verbose=1)# step7:训练模型history = history.fit(train_images,                      train_labels,                      epochs=10,                      batch_size=32,                      validation_data=(test_images, test_labels),                      callbacks=[save_callback])

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