Update instructions for retrieval

[neubig]

Description

This PR updates the dataset retrieval section of the notebook demo to remove all places where the CLI was used for input. Now all of the design decisions can be modified by changing variables in the jupyter notebook.

References

• This is part of Add colab demo #290

Blocked by

• NA

[zhaochenyang20]

I have a suggestion for this line:

Set your OpenAI API key as an environment variable. A good way to do this is to create a `.env` file with a single line

OPENAI_API_KEY=<your key here>

and then run the following command.

Add this:

and then run the following command to load environment variables from your `.env` file into the running script.

Sorry I do not add this suggestion in previous PR review.

[zhaochenyang20]

"In this demo, we will use the following prompt to specify a **question answering system**. If you want to try prompt2model on a new task, you can write a similar prompt by swapping in a new description and new examples. Note that this format is a bit flexible, so you don't have to follow this *exact* format, but it is a good starting point."

Here is my suggestion:

"In this demo, we will use the following prompt to specify a **question answering system**. If you want to try prompt2model on a new task, you can write a similar prompt by swapping in a new description and new examples. Note that this format is a bit flexible, so you don't have to follow this *exact* format, but it is a good starting point. We also have some suggestions for [writing good prompts](./prompt_examples.md)"

[zhaochenyang20]

Amazing code!!!