Vistar

Results 2 issues of Vistar

Hi. When i try to use example from [MachineLearning-DeepLearning-Code-for-my-YouTube-Channel](https://github.com/rohan-paul/MachineLearning-DeepLearning-Code-for-my-YouTube-Channel) in google colab after training model i've got next error: ![изображение](https://user-images.githubusercontent.com/5312683/194927368-faaefeec-97f9-4aa0-a421-7fcbb7970678.png) Also, when i try use 'tf' got another error ![изображение](https://user-images.githubusercontent.com/5312683/194927534-9bbec03e-eb27-4146-9ba2-1feda94e9199.png)

Has troubles with initialization after collapse and then expand tab (panel). No platform errors. Just blank panel ( ![image](https://user-images.githubusercontent.com/5312683/40650946-32e6b7c2-633d-11e8-9167-2251f97f828d.png)