[utils] update precision of speed metric

wenet-e2e / wenet

Production First and Production Ready End-to-End Speech Recognition Toolkit

https://wenet-e2e.github.io/wenet/

Apache License 2.0

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Closed xingchensong closed 1 month ago

xingchensong commented 1 month ago

when accum_grad is large, say 16, steps/sec might be less than 0.1