Seems like colab already have transformers and sentencepice installed

[Chapter 0](https://huggingface.co/learn/llm-course/en/chapter0/1) recommends to install transformers (`!pip install transformers`) and sentencepiece (`!pip install transformers[sentencepeice]`) in google colab notebook in the beginning.

Looks like both of them comes with colab pre-installed. So, a check can be added before installing them.
Ex:
```
!pip freeze | grep "transformers\|sentencepiece"
>> sentencepiece==0.2.0
transformers==4.51.3
```