code: func (cache *schedulerCache) createImageStateSummary(state *imageState) *schedulernodeinfo.ImageStateSummary {
  	return &schedulernodeinfo.ImageStateSummary{
  		Size:     state.size,
  		NumNodes: len(state.nodes),
  	}
  }
docs: // createImageStateSummary returns a summarizing snapshot of the given image's state.