Comments (17)
I restarted to write a code for multiple observations.
I think I can send PR soon.
- rand
- likelihoods
- forward
- backward
- posterior
- update_a!
- update_A!
- update_B!
- fit_mle
- viteribi
from hmmbase.jl.
Thanks to your original code!
I'll try fixing things step by step.
from hmmbase.jl.
Hello! I need this feature for some data I have, where also I have multiple time-series of different lengths.
What's the current status? I saw the linked PR got closed, but I'm not sure why?
Thanks!
from hmmbase.jl.
Hi,
Parameter estimation with multiple sequences (of potentially different lengths), is not currently supported in HMMBase
. It's something that I would like to implement (in mle.jl), but I don't know when.
I'm not sure if variable length sequences are supported by MS_HMMBase
.
I'll keep this issue open as a reminder to try to implement this :-)
from hmmbase.jl.
Thank you for your reply :)
At least I can implement the algorithm with a specific distribution, but I don’t know how to make it work with an arbitrary distributions...
from hmmbase.jl.
In HMMBase I make use of the Distributions.jl
package for the pdf
(likelihood) and fit_mle
(parameter estimation) methods. This way I can handle any observations distributions that implement these methods.
I only need to compute the "responsibilities" (assignments probabilities) for each observations and each states, and re-estimate the transition matrix.
See https://github.com/maxmouchet/HMMBase.jl/blob/master/src/mle.jl#L58-L68 where I delegate to fit_mle
.
from hmmbase.jl.
Hi again,
I'm now trying to integrate my code to this package.
BTW, I'm not sure what you mean by responsibilities of each observations.
from hmmbase.jl.
By "responsibilities" I mean P(Z_t = i | Y, θ)
, where Z_t
is the hidden state at time t, Y
the observations, and θ
the model parameters.
from hmmbase.jl.
Thank you.
I have another question.
I was thinking that we scale β
with c
calculated from α
.
Lines 56 to 67 in f992852
Do I need to calculate another
c
in β
?from hmmbase.jl.
You're right, it's possible to use the same scaling vector c
for α
and β
.
It's not done, for now, to keep the code simple :-)
from hmmbase.jl.
Sorry for asking many questions!
Why do we have to subtract m
from loglikelihood?
Lines 39 to 43 in 2ebf644
Lines 103 to 123 in 2ebf644
from hmmbase.jl.
No worries!
This is the log-sum-exp trick : https://en.wikipedia.org/wiki/LogSumExp
It prevents exp(LL[t,j]) from overflowing.
from hmmbase.jl.
Nice!
I recently cleaned-up the code by removing the logl
keyword and the methods that do not use the log-likelihoods.
Basically everything is done using the log-likelihoods now.
Feel free to open a PR, and I'll help you if there are merge conflicts.
from hmmbase.jl.
Hi.
I changed my codes to adapt to your new api.
I implemented some new functions assuming 2 situations;
- multiple observations with same length
- multiple observations with different(random) length
I haven't finished writing codes for multivariate model in situation 2.
This notebook is an example.
Is it ok to open a pr?
To be honest, this is my first time using github so I'm not sure when to open it...
from hmmbase.jl.
I think the correct URL is https://nbviewer.jupyter.org/github/SosUts/HMMBase.jl/blob/multiple_sequences/notebooks/multiple%20sequences.ipynb :)
This looks very nice!
Thank you for your work :)
You can open a PR now, and I'll review the code.
It is still possible to push new commits to your branch after the PR is opened, so there is no problem to make further modifications.
from hmmbase.jl.
I opened it. Thank you as always!
Edit:
I forgot to consider about the tests.
Should I change the tests, or should I close the PR and change the codes?
from hmmbase.jl.
No worries, you can keep the PR open!
Every commit that you add to your branch will be added to the PR automatically.
I'm a bit busy this week, so I'll try to have a look at the PR this week-end, or the next one.
In any case your code looks clean :)
from hmmbase.jl.
Related Issues (20)
- Error in mle.jl? HOT 1
- Benchmarks vs MS_HMMBase & question about messages_backwards_log
- 2 state and 3 observation HMM HOT 3
- Stable documentation is not up-to-date HOT 1
- HMM with observations as probabilities HOT 13
- viterbi(hmm, y) got "ERROR: BoundsError: attempt to access T×5 Array{Int64,2} at index [T-1, 0]" HOT 2
- Unable to fit using Multivariate LogNormal distribution HOT 2
- I can not recover the original parameters HOT 1
- Running into an argument error in Distributions when using fit_mle HOT 1
- Product of Discrete, Bernoulli HOT 1
- kmeans initialization doesn't support a user defined estimator
- Possible error in `fit_mle!`?
- Compat for Distributions.jl v0.25? HOT 1
- TagBot trigger issue HOT 4
- Improve documentation for novices HOT 1
- Example for multivariate features GMMHMM, include in docs HOT 1
- Application for new maintainer HOT 6
- Implement serialization/deserialization HOT 1
- Em Algorithm Speedup HOT 3
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