ValLoop¶ class mmengine.runner.ValLoop(runner, dataloader, evaluator, fp16=False)[source]¶ Loop for validation. Parameters runner (Runner) – A reference of runner. dataloader (Dataloader or dict) – A dataloader object or a dict to build a dataloader. evaluator (Evaluator or dict or list) – Used for computing metrics. fp16 (bool) – Whether to enable fp16 validation. Defaults to False. Return type None run()[source]¶ Launch validation. Return type dict run_iter(idx, data_batch)[source]¶ Iterate one mini-batch. Parameters data_batch (Sequence[dict]) – Batch of data from dataloader.