Fix uninformative val_loss - #60
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…nd at validation At validation, _sample_background returns None. The renderer turns None into a white background while _prepare_target composites the target on black, so the unmasked perceptual term sees a whole-frame background mismatch and val_loss is inflated to a near-constant value. Return a fixed black background at eval so the render and the composited target share it. Training (random_background) is unchanged.
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Fixes #59
At validation, _sample_background returns None. The renderer turns None into a white background while _prepare_target composites the target on black, so the unmasked perceptual term sees a whole-frame background mismatch and val_loss is inflated to a near-constant value.
Fixed by returning a fixed black background at eval so the render and the composited target share it. Training (random_background) is unchanged.