[relay] Simulating `lenet`, add Relay to `fud`, other bug fixes.#504

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cgyurgyik merged 14 commits intomasterfrom relay

May 13, 2021

+1,134-168

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Merge branch 'master' into relay
cgyurgyik
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Commits on May 12, 2021

Address griffin's review
cgyurgyik
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Commits on May 13, 2021