[ENH] Create a CHROMA_HOME variable to alter Download Path for Emebeddings.

[achillesrasquinha]

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • Improvement: Create a CHROMA_HOME variable to alter Download Path for Emebeddings. This helps overwrite in cases where you wish to redirect the download (e.g., Lambda). Similar to sentence-transformer's *_HOME.
• New functionality
  • ...

Test plan

How are these changes tested?

• [ ] Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the docs repository?

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Reviewer Checklist

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Testing, Bugs, Errors, Logs, Documentation

• [ ] Can you think of any use case in which the code does not behave as intended? Have they been tested?
• [ ] Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• [ ] If appropriate, are there adequate property based tests?
• [ ] If appropriate, are there adequate unit tests?
• [ ] Should any logging, debugging, tracing information be added or removed?
• [ ] Are error messages user-friendly?
• [ ] Have all documentation changes needed been made?
• [ ] Have all non-obvious changes been commented?

System Compatibility

• [ ] Are there any potential impacts on other parts of the system or backward compatibility?
• [ ] Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• [ ] Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

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Name	Status	Preview	Comments	Updated (UTC)
chroma	❌ Failed (Inspect)			May 28, 2024 2:22am

[jeffchuber]

@achillesrasquinha can you help me understand the use case more here? is is that you need to set where the default embedding function downloads in serverless envs?