only import cohere when using cohere functionality

[avyfain]

https://github.com/jxnl/instructor/pull/866/files breaks non-cohere users. This PR should solve that issue.

Will separately open a ticket to have tests run on clean installs.

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🚀	This description was created by Ellipsis for commit 8e8bf8b

Summary:

Import cohere only when using its functionality to avoid breaking non-cohere users in instructor/function_calls.py.

Key points:

• File: instructor/function_calls.py
• Class: OpenAISchema
• Method: parse_cohere_json_schema
• Change: Moved the import of NonStreamedChatResponse from cohere inside the parse_cohere_json_schema method to avoid breaking non-cohere users.

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[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to 8e8bf8b in 25.965249 seconds

More details

• Looked at 28 lines of code in 1 files
• Skipped 0 files when reviewing.
• Skipped posting 1 drafted comments based on config settings.

1. instructor/function_calls.py:282

• Draft comment:
  The change to conditionally import NonStreamedChatResponse within parse_cohere_json_schema is a good practice to avoid issues for users who do not use Cohere. This approach minimizes the impact on users who do not have the cohere package installed.
• Reason this comment was not posted:
  Confidence changes required: 0%
  The PR aims to fix an issue for non-Cohere users by conditionally importing the NonStreamedChatResponse from the cohere package only within the method that requires it. This is a common practice to avoid unnecessary imports that might cause issues for users who do not have certain dependencies installed. The change is localized to the parse_cohere_json_schema method where the NonStreamedChatResponse is specifically needed. The use of assert isinstance(completion, NonStreamedChatResponse) right after the import ensures that the completion object is of the expected type, which is a good practice for type checking especially when dynamic imports are used.

Workflow ID: wflow_Eq502eGFjzeCMXeP

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