code: private void removeViewHolders(@Nullable Collection<ViewHolder> toRemove) {
          if (toRemove != null) {
              for (ViewHolder holder : toRemove) {
                  mViewHolders.remove(holder.getRowIndex(), holder.getColumnIndex());
              }
          }
      }
docs: Remove item view holders from base collection
  
  @param toRemove Collection with view holders which need to remove