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fix(engine): lazy import of tqdm so the test path stays import-free #4

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Merged
Mathos34 merged 1 commit into from
Jun 5, 2026
Merged

fix(engine): lazy import of tqdm so the test path stays import-free #4

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6 changes: 5 additions & 1 deletion src/engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,14 @@
import torch.nn as nn
import torch.nn.functional as F
from torch.utils.data import DataLoader
from tqdm import tqdm


def train_one_epoch(model, loader: DataLoader, opt, loss_fn=None) -> float:
"""Standard training epoch. tqdm is imported lazily so that callers that
only need `distillation_loss` or `benchmark_latency` (e.g. the unit-test
path) do not pay the tqdm install cost."""
from tqdm import tqdm # noqa: PLC0415

model.train()
if loss_fn is None:
loss_fn = nn.CrossEntropyLoss()
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