Is it possible to convert a NNUE file (weights and biases) to emulate an older version?

[ginkgo20]

For example :

Is it possible to convert nn-e8321e467bf6.nnue file to emulate nn-8a08400ed089.nnue file?

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[vondele]

not that I know.

[vondele]

I think you might be able to 'inject' some smaller networks in a larger one for some versions (e.g. larger sized network, with a suitable set of zeros could mimic a smaller one). We don't have the tools to do that, and I won't know which versions would allow for this.

You might also be able to train a network on the output of another network, but that's practically not going to lead to a true conversion (sometimes called a distillation).

[ginkgo20]

• I close this issue due to Implemented LEB128 in feature transformer Stockfish#4617

When NNUE file size reduce then we don't need to convert NNUE file to older version , Thanks @MaximMolchanov