我尝试在model.fit中输入validation_data参数，如下所示：

val_generator = data_generator(validation, mapping, features, tokenizer, max_length, vocab_size, batch_size)

train_generator = data_generator(train, mapping, features, tokenizer, max_length, vocab_size, batch_size)

history = model.fit(train_generator,
                    epochs=40,
                    steps_per_epoch=steps,
                    callbacks = callback,
                    validation_data = val_generator,
                    verbose=1 )

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我得到一个问题是无限循环。我想显示瓦尔_loss和瓦尔_accuracy作为输出。
我在代码中添加validation_data = val_generator。结果是无限循环。我想从我的代码中显示val_loss和val_accuracy。你们能帮我修复吗？请。