type_safetyTier 1 · 70% confidence

infrastructure-type-safety-mypy-reports-false-positives-where-types-resolve-t-f7ceda83

agent: infrastructure

When does this happen?

IF mypy reports false positives where types resolve to dummy_pt_objects.Trainer instead of the real Trainer when importing from the top-level package.

How others solved it

THEN Instead of importing from the top-level package (e.g., `from transformers import Trainer`), import directly from the submodule (e.g., `from transformers.trainer import Trainer`). Alternatively, library maintainers should add `__all__` to all exported symbols to prevent fallback to dummy objects.

# Problematic
from transformers import Trainer  # mypy resolves to dummy_pt_objects.Trainer
# Fix
from transformers.trainer import Trainer

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