Load a list of arrays into a list of arrays specified by slices.

def _load_general(data, targets):
    """Load a list of arrays into a list of arrays specified by slices."""
    for d_src, d_targets in zip(data, targets):
        if isinstance(d_targets, nd.NDArray):
            d_src.copyto(d_targets)
        else:
            assert d_targets[-1][0].stop == d_src.shape[0], \
                "Batch size miss match. Expected %d, got %d"%( \
                    d_targets[-1][0].stop, d_src.shape[0])
            for slice_idx, d_dst in d_targets:
                d_src[slice_idx].copyto(d_dst)