[hts-users:02315] Fwd: So influential stream weight?

[Junichi Yamagishi <jyamagis@xxxxxxxxxxxx>]

Hi all,

Hui from IDIAP found a bug of HTS again.

I have already reported this to Heiga and he would
kindly send the patch for this issue to you soon.

Regards,
Junichi

Begin forwarded message:

> $B:9=P?M(B: "Hui LIANG (@Idiap)" <hui.liang@xxxxxxxx>
> $BF|;~(B: 16 July 2009 10:44:01 BST
> $B08@h(B: Junichi Yamagishi <jyamagis@xxxxxxxxxxxx>
> $B7oL>(B: So influential stream weight?
>
> Hello, Yamagishi-san,
>
> My question came from some weird occupancy values given by HERest when
> it estimated speaker-specific CMLLR transforms. In my experiment,  
> there
> were *two* mixture components in each bndap stream. I used only one
> adaptation utterance for the moment, in which there were 1765  
> frames. If
> the stream weight of bndap was set to 0.0, HERest gave such strange
> occupancy values during transform estimation:
>
> Node 6 (stream=5, vsize=15, occ=0.000000)
> Node 14 (stream=5, vsize=15, occ=0.000000)
> Node 9069 (stream=5, vsize=15, occ=0.000000)
> Node 9095 (stream=5, vsize=15, occ=0.000000)
> Node 9107 (stream=5, vsize=15, occ=0.000000)
> Node 9132 (stream=5, vsize=15, occ=0.000000)
> ....
>
> Node 6 here was the root node of my bndap regression tree. Since the
> occupancy is 0.0, I got no transforms for bndap.
>
> I also tried 0.8, 1.0 and 1.5 as the bndap stream weight. I found the
> occupancy value of Node 6 varied greatly. See:
>
> bndap stream weight: 0.8
>        Node 6 (stream=5, vsize=15, occ=3.425499)
> bndap stream weight: 1.0
>        Node 6 (stream=5, vsize=15, occ=1764.913008)
> bndap stream weight: 1.5
>        Node 6 (stream=5, vsize=15, occ=12001236446949118)
>
> However, if there was only *one* mixture component in each bndap  
> stream,
> the occupancy value was almost a constant. See:
>
> bndap stream weight: 0.0
>        Node 6 (stream=5, vsize=15, occ=1764.810253)
> bndap stream weight: 0.8
>        Node 6 (stream=5, vsize=15, occ=1764.853866)
> bndap stream weight: 1.0
>        Node 6 (stream=5, vsize=15, occ=1764.738418)
> bndap stream weight: 1.5
>        Node 6 (stream=5, vsize=15, occ=1764.805865)
>
> I am not sure if these weird values are due to something hard-coded in
> HTS. According to my understanding, a stream weight shouldn't be so
> influential.
>
> Thank you very much in advance!
>
> Hui LIANG

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