markov-models/report/report.lyx

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Hidden Markov Model Analysis
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Andy Pack
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EEEM030
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January 2021
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Department of Electrical and Electronic Engineering
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Faculty of Engineering and Physical Sciences
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University of Surrey
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Andy Pack / 6420013
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January 2021
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Introduction
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The Markov model is a stochastic model for analysing random processes.
The model describes a system of multiple states and the transitions between
them; a key feature is the
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Markov property
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which states that the future state of the system depends only on the current
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Described markov chains
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Difference with hidden markov models
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Application to machine learning and speech in particular
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Brief
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This work analyses a continuous-density hidden Markov model of 2 emitting
states describing a 1D observation space.
Various statistics and calculations will be conducted on the model including
forward, backward, occupation and transition likelihoods.
Using these, an iteration of training will be completed using the Baum-Welch
equations resulting in a new set of transition probabilities and re-estimated
output probabilities.
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The model is specified as follows; the transition probabilities are described
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These, in combination, describe a state topology than can be seen graphically
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As previously mentioned, the states are described 1D continuous probability
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Finally, a set of observations from the above model are provided below,
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These are used as the basis for training the model using the Baum-Welch
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Implementation
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State topology for the specified Markov Model
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Results
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Output Probability Density Functions
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Probability density functions for both states across the observation space
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Observation Probability Densities
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</lyxtabular>
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\end_layout
\begin_layout Plain Layout
\begin_inset Caption Standard
\begin_layout Plain Layout
Occupation likelihoods for each state at each time step (4 s.f.)
\begin_inset CommandInset label
LatexCommand label
name "tab:Occupation-likelihoods"
\end_inset
\end_layout
\end_inset
\end_layout
\end_inset
\end_layout
\begin_layout Subsection
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Baum-Welch Re-estimations
\end_layout
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\begin_layout Subsubsection
Output Parameters
\end_layout
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\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open
\begin_layout Plain Layout
\noindent
\align center
\begin_inset Graphics
filename res/re-est-pdfs.png
width 50col%
\end_inset
\end_layout
\begin_layout Plain Layout
\begin_inset Caption Standard
\begin_layout Plain Layout
Probability density functions following re-estimation of parameters
\begin_inset CommandInset label
LatexCommand label
name "fig:Re-estimated-PDFs"
\end_inset
\end_layout
\end_inset
\end_layout
\end_inset
\end_layout
\begin_layout Subsubsection
State Transitions
\end_layout
\begin_layout Section
Discussion
\end_layout
\begin_layout Section
Conclusion
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\end_layout
\begin_layout Standard
\begin_inset Newpage newpage
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\end_layout
\begin_layout Standard
\begin_inset CommandInset label
LatexCommand label
name "sec:bibliography"
\end_inset
\begin_inset CommandInset bibtex
LatexCommand bibtex
btprint "btPrintCited"
bibfiles "references"
options "bibtotoc"
\end_inset
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\begin_layout Section
\start_of_appendix
Intermediate Results
\end_layout
\begin_layout Section
Source Code
\end_layout
\begin_layout Standard
\begin_inset CommandInset include
LatexCommand lstinputlisting
filename "../constants.py"
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lstparams "caption={Constants file defining initial state transition probabilities and PDF parameters},label={constants-listing}"
\end_inset
\end_layout
\begin_layout Standard
\begin_inset CommandInset include
LatexCommand lstinputlisting
filename "../maths.py"
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lstparams "caption={Maths utility file with definition for a gaussian},label={maths-listing}"
\end_inset
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\end_layout
\begin_layout Standard
\begin_inset CommandInset include
LatexCommand lstinputlisting
filename "../markov.py"
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lstparams "caption={Markov model object defining forward and backward procedure, occupation likelihoods, Baum-Welch equations},label={markov-listing}"
\end_inset
\end_layout
\begin_layout Standard
\begin_inset CommandInset include
LatexCommand lstinputlisting
filename "../markovlog.py"
lstparams "caption={Child Markov model re-implementing calculations using log probability and likelihood},label={log-markov-listing}"
\end_inset
\end_layout
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\begin_inset Newpage newpage
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\begin_layout Standard
The development of the model behind this report was completed using Jupyter
Notebook.
The used notebook can be seen formatted in plain text below, the relevant
mark scheme elements are referenced in brackets.
\end_layout
\begin_layout Standard
\begin_inset CommandInset include
LatexCommand lstinputlisting
filename "../notebook.py"
lstparams "caption={Plain output of Jupyter Notebook used for development and debugging},label={notebook-listing}"
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\end_inset
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\end_layout
\end_body
\end_document