estimator.py 文件源码

def _extract_metric_update_ops(eval_dict):
        """Separate update operations from metric value operations."""
        update_ops = []
        value_ops = {}
        # Sort metrics lexicographically so graph is identical every time.
        for name, metric_ops in sorted(six.iteritems(eval_dict)):
            value_ops[name] = metric_ops[0]
            update_ops.append(metric_ops[1])

        if update_ops:
            update_op = control_flow_ops.group(*update_ops)
        else:
            update_op = None

        return update_op, value_ops