Python 检查目标时出错：预期激活\u final具有形状（60），但获得具有形状（4）的数组

] ) 我得到了这个错误idk如何修复它我是一个新手到ML

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检查目标时出错：预期激活\u final的形状为（60，）但得到的数组的形状为（4，）

用测试生成器替换测试图像\u iter 验证数据 验证数据=测试生成器， 验证步骤=测试生成器。n//32

# train the model
start = dt.now()
show = my_model.fit_generator(
# training data
train_generator,

# epochs
steps_per_epoch = train_generator.n // 32, #floor per batch size
epochs = 15, 

# validation data
validation_data = test_images_iter,
validation_steps = test_images_iter.n // 32,

#  print progress
verbose = 1,
callbacks = [
#early stopping in case the loss stops decreasing
k.callbacks.EarlyStopping(monitor='val_loss', patience=3),
# only save the model if the monitored quantity (val_loss or val_acc) has improved
k.callbacks.ModelCheckpoint("fruits_checkpoints.h5", monitor='val_loss', save_best_only = True),
# only needed for visualising with TensorBoard
k.callbacks.TensorBoard(log_dir = "logs/{:%d_%b_%Y_%H:%M:%S}".format(dt.now()) )