[hts-users:03729] Re: A problem with decision tree-based context clustering

[Yongxin Wang <fefe.wyx@xxxxxxxxx>]

The first node is the FALSE node, not the TRUE node. So for reaching
"tri_s21", F3_sonorant and F3_non-sonotant must both be FALSE. The
condition can be met if there is a label that cannot match any of the
patterns listed in F3_sonorant and F3_non-sonotant. For example,
"w-.....". If that should not happen, there may be something wrong
with your labels.

I suggest checking your label files.

On Sun, Apr 21, 2013 at 10:12 PM, Fahime Bahmany
<fahime.bahmany@xxxxxxxxx> wrote:
> Hi,
>
> I intended to create tied-state triphones using HMM Toolkit (HTK) in order
> to train a context-dependent HMM.
> Attached tree results from my experiment which is generated by running
> following command:
>
> HHEd -H myhmms/hmm3_tri3/newMacros -M myhmms/hmm3_tri4(8) tree(8).hed
> triphones1 > log
>
> This command is written based on the explanation given by Section 3.3.2 of
> HTK-book.
>
> The initial part of this tree for 2-nd state is as follow:
>    0            'F4_sonorant'      -1         -3
>   -1            'F3_sonorant'      -2         -6
>   -2        'F3_non-sonotant'      -4         -8
>   -3           'F4_vowel_low'      -5         -7
>   -4               'F5_Vowel'  "tri_s21"     -45
>
> It is obvious that the terminal node "tri_s21" is unreachable; since, for
> reaching this leaf F4_sonarant, F3_sonorant, and F3_non-sonotant must be
> true. However, F3 cannot be both sonarant and non_sonorant.
> I am really surprised at this problem.
>
> Thanks a bunch in advance,
> Fahimeh
>
>
>
>
> On Sun, Apr 21, 2013 at 5:38 PM, Yongxin Wang <fefe.wyx@xxxxxxxxx> wrote:
>>
>> Would you provide us your clustered tree and show us the path that you
>> think is unreachable?
>>
>> On Sun, Apr 21, 2013 at 3:44 AM, Fahime Bahmany
>> <fahime.bahmany@xxxxxxxxx> wrote:
>> > Hi,
>> >
>> > I have a problem with decision trees which are resulted in context
>> > clustering.
>> > Some leaves of the tree may be unreachable when we cluster the contexts.
>> > In
>> > other words, when we trace some paths of the tree we may encounter
>> > questions
>> > that are in contrast to one of the questions in that path. This problem
>> > causes the terminal node in that path to be unreachable.
>> >
>> > I would be really grateful if someone could help me through this
>> > problem.
>> > Thanks in advance
>> >
>> >
>>
>