Code example doesn`t work in Basic Concepts of Keras

[Taranis71]

Code example doesn`t work in Basic Concepts of Keras

There is a code example in that exercise, that doesn't work.
If you execute the part "Changing Optimization Parameters" the event handler throws the following error:
Argument learning_rate should be float, or an instance of LearningRateSchedule, or a callable (that takes in the current iteration value and returns the corresponding learning rate value). Received instead: learning_rate=1

The problem is caused by this line of code:

To solve the problem change the argument 1 in the learningrates (integer) to 1.0 (float), like this:

After that correction the code examples should work.

I am using the following software components:

• Browser: Chrome
• Python IDE: Google Colab