gtying

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                                            gtying

this is a problem to run this code ,but i don't how to solve , please query a help,"construct_original_network grads = tape.gradient(preds[:,c], x) File "C:\Users\高婷\AppData\Roaming\Python\Python37\site-packages\tensorflow\python\eager\backprop.py", line 1086, in gradient unconnected_gradients=unconnected_gradients) File "C:\Users\高婷\AppData\Roaming\Python\Python37\site-packages\tensorflow\python\eager\imperative_grad.py", line 77, in imperative_grad compat.as_str(unconnected_gradients.value)) AttributeError: 'KerasTensor' object has no attribute '_id'"