is holdback testing and validation the same what is holdback validation are test and validation the same is testing and validation the same in bootstrap is the test and validation part similar in bootstrap is held back validation valid is a holdback validation valid holdback validation test validation is tested and tested validated same holds back validation test what is the holdback validation for bootstrap test? why is test and validation similar? holdback validation is holdback validation valid is test and validation the same is holdback testing ok is holdback validation valid what is holdback validation is holdback testing valid is a validation model valid?