Patent ID: 11922932
Assignee: GOOGLE LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. A system comprising:
data processing hardware; and
memory hardware in communication with the data processing hardware and storing instructions that, when executed on the data processing hardware, causes the data processing hardware to perform operations comprising:
receiving a sequence of feature vectors indicative of acoustic characteristics of a training utterance;
receiving a ground-truth label sequence corresponding to the training utterance; and
training a speech recognition model to minimize word error rate by performing operations comprising:
processing, using the speech recognition model, the sequence of feature vectors to obtain a set of speech recognition hypothesis samples for the training utterance in a beam search;
for each speech recognition hypothesis sample in the set of speech recognition hypothesis samples, identifying a respective number of word errors relative to the ground-truth label sequence corresponding to the training utterance; and
approximating a loss function based on a combination of the respective numbers of word errors identified for each speech recognition hypothesis sample in the set of speech recognition hypothesis samples.