pub fn demand(image: &Image, output: Region) -> Result<Vec<(NodeId, Region)>>Expand description
The regions each node of image’s graph would be asked for, for diagnostics.
This walks the same inverse mapping the evaluator uses, without computing any pixels — useful for asserting in tests that an op’s demand propagation is what it claims, and a stepping stone to M2’s scheduling.
§Errors
Propagates Op::input_regions.