ai-agents-type-stubs-mypy-reports-false-positive-errors-e-g-trainer-has-fcd78370

THEN Import the class directly from its submodule instead of from the top-level package. For example, use `from transformers.trainer import Trainer` and `from transformers.modeling_utils import PreTrainedModel` instead of `from transformers import Trainer, PreTrainedModel`.

# Before (triggers mypy errors):
from transformers import Trainer, PreTrainedModel
trainer = Trainer()
trainer.train()  # mypy error: "Trainer" has no attribute "train"

# After (fix):
from transformers.trainer import Trainer
from transformers.modeling_utils import PreTrainedModel
trainer = Trainer()
trainer.train()  # no mypy error