Incorrect Reference to OpenAIError in backoff Decorator Causes Failed Import

[Blatzheim]

In chatgpt.py, the backoff decorator for the chat function is incorrectly referencing openai.error.OpenAIError, which causes a ModuleNotFoundError as there appears to be no openai.error submodule. The way it worked for me was to reference OpenAI's error handling is directly through openai.OpenAIError.

python v3.10.15
openai v1.51.2
graph-of-thoughts v0.0.2

Steps to reproduce:

1. Ensure versions match (see below).
2. run the python interpreter and try to import chatgpt.py e.g. via the controller: from graph_of_thoughts import controller

Before:

@backoff.on_exception(
    backoff.expo, openai.error.OpenAIError, max_time=10, max_tries=6
)

Solution:

@backoff.on_exception(
    backoff.expo, openai.OpenAIError, max_time=10, max_tries=6
)