我正在训练一个面部表情（愤怒 vs 快乐）模型。最后一个密集输出层以前是 1，但是当我预测图像时，它的输出始终为 1，准确度为 64%。所以我将其更改为 2 以获取 2 个输出。但现在我收到这个错误::
Epoch 1/15
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-54-9c7272c38dcb> in <module>()
11 epochs=epochs,
12 validation_data = val_data_gen,
---> 13 validation_steps = validation_steps,
14
15 )
10 frames
/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/func_graph.py in wrapper(*args, **kwargs)
966 except Exception as e: # pylint:disable=broad-except
967 if hasattr(e, "ag_error_metadata"):
--> 968 raise e.ag_error_metadata.to_exception(e)
969 else:
970 raise
ValueError: in user code:
/usr/local/lib/python3.6/dist-packages/tensorflow/python/keras/engine/training.py:571 train_function *
outputs = self.distribute_strategy.run(
/usr/local/lib/python3.6/dist-packages/tensorflow/python/distribute/distribute_lib.py:951 run **
return self._extended.call_for_each_replica(fn, args=args, kwargs=kwargs)
/usr/local/lib/python3.6/dist-packages/tensorflow/python/distribute/distribute_lib.py:2290 call_for_each_replica …