tf.contrib.framework.reduce_sum_n(tensors, name=None)
Reduce tensors to a scalar sum.
This reduces each tensor in tensors to a scalar via tf.reduce_sum, then adds them via tf.add_n.
Args:
tensors: List of tensors, all of the same numeric type.
name: Tensor name, and scope for all other ops.
Returns:
Total loss tensor, or None if no losses have been configured.
Raises:
ValueError: if losses is missing or empty.
