No module named 'keras.engine.topology'

This error message indicates that the 'keras.engine.topology' module is not found in your Python environment. This module is a part of the Keras library, which is used for building neural networks.

To resolve this error, you can try the following steps:

1. Ensure that Keras is installed in your Python environment. You can install it using the following command:

`pip install keras`

2. If you have already installed Keras, check if it is up-to-date. You can update it using the following command:

`pip install keras --upgrade`

3. If you are using an older version of Keras, try importing the module using the following code:

`from keras.layers import Input, Dense`

`from keras.models import Model`

4. If none of the above steps work, try reinstalling the Keras library.

`pip uninstall keras`

`pip install keras`

If you are still unable to resolve the error, please check if there are any other dependencies that might be causing the issue.