about contrib.sym.ctc_loss?

[BackT0TheFuture]

Hi,there
how to change warpctc with mx.contrib.sym.ctc_loss?
thx!

[Soonhwan-Kwon]

Okay I expect it easy and will try to update it today or tomorrow

[Soonhwan-Kwon]

I tried to make change to mx.contrib.sym.ctc_loss but I found that there is an issue for performance now.
Please see apache/mxnet#7154.
As far as I know baidu's warpctc has gpu mode, so cpu mode for ctc_loss is inappropriate.
Meanwhile, I expect external warpctc is safe to use.

[BackT0TheFuture]

got it !
thanks !

[fanlu]

apache/mxnet#7442
Dose this not work？

[Soonhwan-Kwon]

It seems that there is a problem still.
Please refer below link
apache/mxnet#7445.
And it seems cpu version and cudnn7 version can not be equal implementation,
and they plans to turn cudnn CTC off because of the API design.
@fanlu

[fanlu]

It looks like a problem.But how do you deal with problems of mx.sym.Group([softmax_loss, ctc_loss]) and STTMetric? @Soonhwan-Kwon