Predict always return empty!

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Hi! I trained a model from the dataset with val_split=0.1 and epochs=1 cause it took too long.
But when I use method, it always return {'rois': array([], shape=(0, 4), dtype=int32), 'class_ids': array([], dtype=int32), 'scores': array([], dtype=float32), 'masks': array([], shape=(512, 512, 0), dtype=float64)}.
Please tell me why?