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In ZSH, not using ' ' around pip install fails

Running 
```
pip install transformers[torch]
```
in the default ZSH terminal will fail with the error `zsh: no matches found: transformers[torch]`

The solution is to wrap the installation path in ' ' like 
```
pip install 'transformers[torch]'
```

Relevant StackOverflow: https://stackoverflow.com/questions/30539798/zsh-no-matches-found-requestssecurity