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implement ctc loss function#1049

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wcshds wants to merge 20 commits intotracel-ai:maintracel-ai/burn:mainfrom wcshds:ctc-losswcshds/burn:ctc-lossCopy head branch name to clipboard

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Commits on Dec 4, 2023

• implement ctc loss function

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• remove vec! macro

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Commits on Dec 5, 2023

• fix wrong indice when assign initial val to alpha

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• update test case

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Commits on Dec 6, 2023

• remove batch loop

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• cache current_target_primes

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• make sure tensors are on the same device

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• use clamp_min instead of mask_where

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Commits on Dec 8, 2023

• remove squence loop

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• use into_scalar in assertions

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Commits on Dec 11, 2023

• reduce the size of log alphas

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• wordaround for slice bug on libtorch backend tracel-ai#1055

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Commits on Dec 12, 2023

• reduce the size of one_hot

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• make sure tensors are on the same device

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Commits on Dec 24, 2023

• Merge branch 'tracel-ai:main' into ctc-loss

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• adapt to burn's new device api

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Commits on Dec 27, 2023

• make sure the argument of the logarithm greater than 0

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• refactor the small value used to prevent log(0) into a constant

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• fix typo

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• remove unnecessary code

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