@Override
    public Tensor remove(Set<TensorAddress> addresses) {
        Tensor.Builder builder = Tensor.Builder.of(type());
        for (Iterator<Tensor.Cell> i = cellIterator(); i.hasNext(); ) {
            Tensor.Cell cell = i.next();
            TensorAddress address = cell.getKey();
            if ( ! addresses.contains(address)) {
                builder.cell(address, cell.getValue());
            }
        }
        return builder.build();
    }
Once we can store more cells than an int we should drop this.
vespajlib/src/main/java/com/yahoo/tensor/MappedTensor.java