A developer using FastAPI and Scikit-learn for a classification model project encountered a sudden error where model names were not recognized, despite no changes in the code. This issue did not occur for teammates using the same code, suggesting a version mismatch in key libraries like FastAPI, Scikit-learn, or regex. The developer’s Python version is 3.11.7. Despite attempts to align library versions with those of teammates and experimenting with different versions, the error persisted. The problem specifically arises at the function where the model name is checked, e.g., `if model_name==”Knn”`. This case highlights the importance of version control in software development, where even without code changes, environmental factors can lead to unexpected errors.
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