tf.gradients is not supported when eager execution is enabled. Use tf.GradientTape instead.

在Tensorflow2.0环境中运行以下代码：

grads = K.gradients(model.output[:,0], last_conv_layer.output)[0]

报错：

tf.gradients is not supported when eager execution is enabled. Use tf.GradientTape instead.

 解决方案：

使用tf1的compat模式禁用eager-execution约束表单tf2，添加如下代码：

import tensorflow as tf
tf.compat.v1.disable_eager_execution()