For the past week, I have been failing to connect to a GPU, even though I have no active sessions whatsoever.
The message that keeps getting popped is the following:
Cannot connect to GPU backend
You cannot currently connect to a GPU due to usage limits in Colab. Learn more
As a Colab Pro subscriber you have higher usage limits than non-subscribers, but availability is not unlimited. To get the most out of Colab Pro, avoid using GPUs when they are not necessary for your work.
Note that I have a Colab Pro account.