Fix: resolution kwarg silently ignored in RFDETR.train()

[Copilot]

TrainConfig extends plain BaseModel (extra fields ignored), so passing resolution=N to .train() was silently dropped — the model always trained at the default config resolution regardless of what the user set.

Changes

• RFDETR.train() now absorbs resolution before forwarding remaining kwargs to get_train_config():
  • Validates divisibility by patch_size × num_windows (raises ValueError if not)
  • Applies directly to self.model_config.resolution
  • Recomputes positional_encoding_size = resolution // patch_size
• Docstring updated to document resolution as a first-class .train() kwarg

Usage

from rfdetr import RFDETRMedium

# RFDETRMedium: patch_size=16, num_windows=2 → resolution must be divisible by 32
model = RFDETRMedium()
model.train(dataset_dir="...", resolution=672)  # now correctly uses 672 instead of 576

Invalid resolutions raise immediately with a clear message:

ValueError: resolution=570 is not divisible by patch_size (16) × num_windows (2) = 32.
Choose a resolution that is a multiple of 32.

Warning

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