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[WIP] Implements RNNT+MMI#1030

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pkufool wants to merge 9 commits intok2-fsa:masterk2-fsa/k2:masterfrom pkufool:rnnt_mmipkufool/k2:rnnt_mmiCopy head branch name to clipboard

+823-25

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Commits on Aug 4, 2022

• draft of importance sampling algorithm

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Commits on Aug 9, 2022

• Generate denominator lattice from sampled paths

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  05aa9f3

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• Fix typos

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Commits on Aug 17, 2022

• Only allow states sampled on final frame to be final state; add unnormalized rnnt loss

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Commits on Aug 18, 2022

• Minor fixes

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  9d8e3e3

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Commits on Aug 31, 2022

• fix importance sampling scores; return arc_map

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Commits on Jan 12, 2023

• return grad in rnnt_loss_pruned

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• Merge branch 'master' into rnnt_mmi

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Commits on Jan 13, 2023

• Remove redundant code

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