Remove half-finished document of BalancedSerialIterator
@@ -92,10 +92,6 @@ class BalancedSerialIterator(iterator.Iterator):
"""Dataset iterator that serially reads the examples with balancing label.
- This is a implementation of :class:`~chainer.dataset.Iterator`
- that visits each example in
-
-
This iterator saves ``-1`` instead of ``None`` in snapshots since some
serializers do not support ``None``.
