can i ask that what means fixed-affine-layer and ReplaceIndex(ivector, t, 0)?

[Anjos]

fixed-affine-layer name=lda input=Append(-2,-1,0,1,2,ReplaceIndex(ivector, t, 0)) affine-transform-file=exp/nnet3/tdnn_sp/configs/lda.mat

ReplaceIndex(ivector, t, 0)  ,the variable t is what?

the affine-transform is how to do?

[Daniel Povey]

t is something inbuilt to the framework, it's the time index.  It means "get the ivector from time t=0, regardless of the t value that we're asked to provide at the output of this expression."

The affine transform thingy is something similar to LDA, but not quite the same.  You don't need to worry about it; recent experiments by Desh (cc'd) show that we can get as good or better performance by computing conventional delta and delta-delta features, which is more standard.

Dan

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[Anjos]

Thank you for Dan. 

在 2019年7月23日星期二 UTC+8上午2:43:03，Dan Povey写道：

t is something inbuilt to the framework, it's the time index.  It means "get the ivector from time t=0, regardless of the t value that we're asked to provide at the output of this expression."

The affine transform thingy is something similar to LDA, but not quite the same.  You don't need to worry about it; recent experiments by Desh (cc'd) show that we can get as good or better performance by computing conventional delta and delta-delta features, which is more standard.

Dan

On Mon, Jul 22, 2019 at 7:39 AM Anjos <aqh...@gmail.com> wrote:

fixed-affine-layer name=lda input=Append(-2,-1,0,1,2,ReplaceIndex(ivector, t, 0)) affine-transform-file=exp/nnet3/tdnn_sp/configs/lda.mat

ReplaceIndex(ivector, t, 0)  ,the variable t is what?

the affine-transform is how to do?

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