Hence our Hidden Markov model should contain three states. The transition matrix, as the name suggests, uses a tabular representation for the transition probabilities. Sequence analysis or time series analysis is to predict the next in a given input sequence based on the previously observed. More formally, a discrete-time Markov chain is a sequence of random variables X1, X2, X3, … that satisfy the Markov property — the probability of moving from the current state to the next state depends solely on the present state. In our lecture on finite Markov chains, we studied discrete-time Markov chains that evolve on a finite state space $S$.. They arise broadly in statistical specially It will, in time, be Focus is shared between theory, applications and computation. Implementation of HMM in Python I am providing an example implementation on my GitHub space. What is the Markov Property? Markov chains are often represented using directed graphs. Import the necessary packages as shown below −, Now, use the stock market data from the matpotlib.finance package, as shown here −, Load the data from a start date and end date, i.e., between two specific dates as shown here −, In this step, we will extract the closing quotes every day. Firstly, for understanding the Markov switching models, a nice knowledge of Markov models and the way they work. You can install Pandas with the help of the following command −, If you are using Anaconda and want to install by using the conda package manager, then you can use the following command −, It is an open source BSD-licensed library which consists of simple algorithms and models to learn Hidden Markov Models(HMM) in Python. Markov models are a useful class of models for sequential-type of data. Markov chains became popular due to the fact that it does not require complex mathematical concepts or advanced statistics to build it. Markov chains are a very simple and easy way to create statistical models on a random process.They have been used for quite some time now and mostly find applications in the financial industry and for predictive text generation. A continuous-time process is called a continuous-time Markov chain (CTMC). Hidden Markov Model (HMM) is a statistical model based on the Markov chain concept. Learning algorithms implemented in PyStruct have names such as conditional random fields(CRF), Maximum-Margin Markov Random Networks (M3N) or structural support vector machines. If we want to build sequence prediction in machine learning, then we have to deal with sequential data and time. . In other words, the HMM describes time-series data with a mixture model that has temporal dependence in its components, throug\൨ a first-order Markov chain. Replete with deep theoretical insights and numerous practical implementations, the book is a comprehensive guide to help you implement probabilistic models for learning complex data sequences using the Python ecosystem. We show that References What makes a Markov Model Hidden? It is denoted by Π. HMM is a stochastic model which is built upon the concept of Markov chain based on the assumption that probability of future stats depends only on the current process state rather any state that preceded it. You can install it with the help of the following command −, It is used for convex optimization based on Python programming language. For time series data analysis using Python, we need to install the following packages −, Pandas is an open source BSD-licensed library which provides high-performance, ease of data structure usage and data analysis tools for Python. For this, use the following command −, Now, we will extract the volume of shares traded every day. Please note that we are implementing this example in Python. The Markov chain is then constructed as discussed above. Browse other questions tagged python time-series probability markov-chains markov-decision-process or ask your own question. We are going to introduce and motivate the concept mathematically, and then build a “Markov bot” for Twitter in Python. A Markov chain (MC) is a state machine that has a discrete number of states, q 1, q 2, . In this assignment, we shall be implementing an authorship detector which, when given a large sample size of text to train on, can then guess the author of an unknown text. Markov decision process. Continuous Time Markov Chains¶ Authors: Thomas J. Sargent and John Stachurski. Hidden Markov Models are a type of stochastic state-space m… ., n-1}. Focus is shared between theory, applications and computation. The Markov chain is then constructed as discussed above. 5. In this setting, the dynamics of the model are described by a stochastic matrix — a nonnegative square matrix $P = … It is denoted by O. Andrey Markov first introduced Markov chains in the year 1906. Hope you found this article interesting. will be in state sj at time t+n. What makes a Markov Model Hidden? In this step, we create the time series data with the help of Pandas Series, as shown below −, Enter the path of the input file as shown here −, Now, convert the column to timeseries format, as shown here −, Finally, plot and visualize the data, using the commands shown −, You will observe the plots as shown in the following images −, Slicing involves retrieving only some part of the time series data. In simplistic mathematical terms, for a stochastic process, S = {R1, R 2, . The nodes in the directed graphs represent the different possible states of the random variables, while the edges represent the probability of the system going from one state to the other in the next time instance. The given time series should be segmented to different-length segments, and for each segment a label (class) should be assigned. To use Python Markov Chain for solving practical problems, it is essential to grasp the concept of Markov Chains. ., R n} = {R} t=1, . 4. Finally, in this step, we plot and visualize the difference percentage and volume of shares traded as output in the form of graph. Another way of representing state transitions is using a transition matrix. Now, a discrete-time stochastic process is a Markov chain if, for t=0, 1, 2… and all states: Essentially this means that a Markov chain is a stochastic process containing random variables transitioning from one state to another depending only on certain assumptions and definite probabilistic rules — having the Markov property. A Markov chain process and a time series process are two completely different kinds of stochastic processes, though all methods behind stochastic processes have similar features. Hence our Hidden Markov model should contain three states. It is denoted by B. On sunny days you have a probability of 0.8 that the next day will be sunny, too. Notebooks to profile python code are in the profile folder; Support. For now let’s just focus on 3-state HMM. Mathematically, HMM consists of the following variables −. Hands-On Markov Models with Python helps you get to grips with HMMs and different inference algorithms by working on real-world problems. . It could also take the value Rainy with a probability of 0.19, or Snowy with a probability of 0.01.  . For time series data analysis using Python, ... HMM is a stochastic model which is built upon the concept of Markov chain based on the assumption that probability of future stats depends only on the current process state rather any state that preceded it. For this, create the range of dates of our time series. Description of Markovify: Markovify is a simple, extensible Markov chain generator. Specifically, we want to keep track of his word flow – that is, which words he tends to use after other words. A Hidden Markov Model for Regime Detection 6. It is denoted by A. In this thesis, we develop an extension of the Hidden Markov Model (HMM) that addresses two of the most important challenges of nancial time series modeling: non-stationary and non-linearity. Specifically, we want to keep track of his word flow – that is, which words he tends to use after other words. A powerful statistical tool for modeling time series data. What is a Markov Model? , q n, and the transitions between states are nondeterministic, i.e., there is a probability of transiting from a state q i to another state q j: P(S t = q j | S t −1 = q i). >>> transition_matrix = [[0.8, 0.19, 0.01], Deploy Your First Machine Learning Model Using Flask, Lennon or McCartney? But, most commonly, it is used to refer to discrete-state-space Markov processes. If you are unfamiliar with Hidden Markov Models and/or are unaware of how they can be used as a risk management tool, it is worth taking a look at the following articles in the series: 1. It is used for analyzing a generative observable sequence that is characterized by some underlying unobservable sequences. In terms of probability distribution, given that the system is at time instance n, the conditional distribution of the states at the next time instance, n + 1, is conditionally independent of the state of the system at time instances {1, 2, . They are widely employed in economics, game theory, communication theory, genetics and finance. Markov Chain Monte Carlo What is Markov Chain Monte Carlo? Our file is having the data which starts from January 1950. In this post we will look at a possible implementation of the described algorithms and estimate model performance on Yahoo stock price time-series. Then, the probability that the random variable at the next time instance will also take the value Sunny is 0.8. This is because a coin does not have any memory and the next result does not depend on the previous result. There are common patterns in all of mentioned examples for instance, they are complex in prediction next part, and need huge mathematic calculation in order to anticipate next point of spreading. 3. Most importantly, an idea of time series models and how they work, is very important. In a previous post, I showed some elementary properties of discrete time Markov Chains could be calculated, mostly with functions from the markovchain package. What is a Markov Model? Hands-On Markov Models with Python helps you get to grips with HMMs and different inference algorithms by working on real-world problems. For this reason, the transition matrix is the standard way of representing Markov chains. 5. Learn about Markov Chains and how to implement them in Python through a basic example of a discrete-time Markov process in this guest post by Ankur Ankan, the coauthor of Hands-On Markov Models with Python. Hands-On Markov Models with Python helps you get to grips with HMMs and different inference algorithms by working on real-world problems. 1. Who is Andrey Markov? They are widely employed in economics, game theory, communication theory, genetics and finance. Now, convert this data to time series. Ordering of data is an important feature of sequential data. Conclusion 7. A Markov chain is a type of Markov process in which the time is discrete. 1. Who is Andrey Markov? Hidden Markov Model (HMM) is a statistical model based on the Markov chain concept. It’s time now to try coding this simple Markov chain. Mean, variance, correlation, maximum value, and minimum value are some of such statistics. Though the basic theory of Markov Chains is devised in the early 20 th century and a full grown Hidden Markov Model(HMM) is developed in the 1960s, its potential is recognized in the last decade only. The probability values represent the probability of the system going from the state in the row to the states mentioned in the columns: The transition matrix represents the same information as in the dictionary, but in a more compact way. An introduction to smoothing time series in python. In the above function, data is the input time series data, n is the total number of states in the Markov chain, step is the transition step. Markov Chains have prolific usage in mathematics. Firstly, for understanding the Markov switching models, a nice knowledge of Markov models and the way they work. It provides a mathematical framework for modeling decision-making situations. The two parameters for performing re-sampling are −, You can use the following code to resample the data with the mean()method, which is the default method −, Then, you can observe the following graph as the output of resampling using mean() −, You can use the following code to resample the data using the median()method −, Then, you can observe the following graph as the output of re-sampling with median() −, You can use the following code to calculate the rolling (moving) mean −, Then, you can observe the following graph as the output of the rolling (moving) mean −. With the help of Pandas, you can perform the following −, Create a range of dates by using the pd.date_range package, Index pandas with dates by using the pd.Series package, Perform re-sampling by using the ts.resample package. The Overflow Blog Podcast 297: All Time Highs: Talking crypto with Li Ouyang In the above Markov chain, consider that the observed state of the current random variable is Sunny. To repeat: At time$ t=0 $, the$ X_0 $is chosen from$ \psi $. Observe the following code that performs this task −, When you run the code for slicing the time series data, you can observe the following graph as shown in the image here −, You will have to extract some statistics from a given data, in cases where you need to draw some important conclusion. In this post we will look at a possible implementation of the described algorithms and estimate model performance on Yahoo stock price time-series. Time series data means the data that is in a series of particular time intervals. Please note, we will not get into the internals of building a Markov chain rather this article would focus on implementing the solution using the Python Module markovify. The algorithm to be implemented works based on the following idea: An author’s writing style can be defined quantitatively by looking at the words he uses. They arise broadly in statistical specially Most importantly, an idea of time series models and how they work, is very important. Using a transition matrix might not seem like a good idea because it requires you to create extra variables to store the indices. For example, when tossing a coin, we cannot say that the result of the fifth toss will be a head. Conclusion 7. ideas are combined with computer code to help clarify and build intuition, as It is the probability of making transition from one state to each of the other states. Consider that there are three possible states of the random variable Weather = {Sunny, Rainy, Snowy}, and the possible Markov chains for this can be represented as shown in Figure 1.1: One of the main points to understand in Markov chains is that you’re modeling the outcomes of a sequence of random variables over time. This is the 2nd part of the tutorial on Hidden Markov models. So, a Markov chain is a stochastic process over a discrete state space satisfying the Markov property. Part IV: Particle Filter ... Because we will only look at one time step at a time, the sequence of points we sample will be a markov chain; and because the method relies on random sampling we call it a markov chain monte carlo (MCMC) method. In particular, if ut is the probability vector for time t (that is, a vector whose j th entries represent the probability that the chain will be in the j th state at time t), then the distribution of the chain at time t+n is given by un = uPn. , q n, and the transitions between states are nondeterministic, i.e., there is a probability of transiting from a state q i to another state q j: P(S t = q j | S t −1 = q i). Speci cally, we extend the HMM to include a novel exponentially weighted Expectation-Maximization (EM) algorithm to handle these two challenges. The following table shows the transition matrix for the Markov chain shown in Figure 1.1. The nodes of the above graph represent the different possible states Weather, and the edges between them show the probability of the next random variable taking different possible states, given the state of the current random variable. Hands-On Markov Models with Python helps you get to grips with HMMs and different inference algorithms by working on real-world problems. 1. I found this tutorial good enough for getting up to speed with the concept. The issue of how best to implement Markov Chains piqued my interest, so here's a little script I crashed out off the top of my head. HMM is a statistic model which is widely used for data having continuation and extensibility such as time series stock market analysis, health checkup, and speech recognition. However, there is a lot of disagreement among researchers on what categories of Markov process should be called Markov chain. Such techniques can be used to model the progression of diseases, the weather, or even board games. Predicting the next in a given input sequence is another important concept in machine learning. I spent about 5 minutes or so writing it, so don't expect the cleanest code, but hopefully it illustrates the point (I didn't use nucleotide sequences, I just invented a random sequence of X, Y and Z): 4. A state in a discrete-time Markov chain is periodic if the chain can return to the state only at multiples of some integer larger than 1. Hence, a HMM may be defined as = (S,O,A,B,). The algorithm to be implemented works based on the following idea: An author’s writing style can be defined quantitatively by looking at the words he uses. Hidden Markov Models - An Introduction 2. As a sample example, I took, data = [3, 0, 1, 3, 2, 6, 5, 4, 7, 5, 4] n = 8 (this means there are 8 states in Markov chain from 0 - 7, both inclusive) step = 1 2. These methods provide simple, easy to use, computationally cheap and human-readable models, suitable for statistic laymans to experts. Please note that all code… Hands-On Markov Models with Python helps you get to grips with HMMs and different inference algorithms by working on real-world problems. For handling time series data, you will have to perform the following steps −, The first step involves importing the following packages −, Next, define a function which will read the data from the input file, as shown in the code given below −. Here A,B,C,D are the given values and you have to predict the value E using a Sequence Prediction Model. Hidden Markov Model (HMM) is a statistical model based on the Markov chain concept. Please note that all code… Consider the following example to understand sequence prediction. We conclude this little Markov Chain excursion by using the rmarkovchain() function to simulate a trajectory from the process represented by this large random matrix and plot the results. In 1906, Russian mathematician Andrei Markov gave the definition of a Markov Chain – a stochastic process consisting of random variables that transition from one particular state to the next, and these transitions are based on specific assumptions and probabilistic rules. It is denoted by S. It is a set of possible output symbols present in a HMM. The self-loops show the probability of the model staying in its current state. This project is continously under improvement and contributors are well come. Hidden Markov Models for Regime Detection using R The first discusses the mathematical and statistical basis behind the model while the second article uses the depmixS4R package to fit a HMM to S&P500 returns. Contribute to kmedian/ctmc development by creating an account on GitHub. Since your friends are Python developers, when they talk about work, they talk about Python 80% of the time… HMM for Time series Segmentation Modeling time series with HMMs 35 As a sample example, I took, data = [3, 0, 1, 3, 2, 6, 5, 4, 7, 5, 4] n = 8 (this means there are 8 states in Markov chain from 0 - 7, both inclusive) step = 1 Use the following code to plot and visualize the difference percentages −, Use the following code to plot and visualize the volume of shares traded −. For time series data analysis using Python, we need to install the following packages − ... HMM is a stochastic model which is built upon the concept of Markov chain based on the assumption that probability of future stats depends only on the current process state rather any state that preceded it. Markov Models From The Bottom Up, with Python Markov models are a useful class of models for sequential-type of data. Before recurrent neural networks (which can be thought of as an upgraded Markov model) came along, Markov Models and their variants were the in thing for processing time series and biological data. . In this post, I would like to show a little bit more of the functionality available in that package by fitting a Markov Chain to some data. This section deals in detail with analyzing sequential data using Hidden Markov Model (HMM). . A Markov chain (MC) is a state machine that has a discrete number of states, q 1, q 2, . The study of Markov Chains is an interesting topic that has many applications. Time series models inherently depend on previous knowledge using lagged variables. Later we can train another BOOK models with different number of states, compare them (e. g. using BIC that penalizes complexity and prevents from overfitting) and choose the best one. Main properties of Markov chains are now presented. will be in state sj at time t+n. To repeat: At time$ t=0 $, the$ X_0 $is chosen from$ \psi $. 2. One thing to note here is that the sum of all the probability values on all the outward edges from any state should equal 1, since it’s an exhaustive event. MDP is an extension of the Markov chain. In this example, we are going to analyze the data of stock market, step by step, to get an idea about how the HMM works with sequential or time series data. . Main properties of Markov chains are now presented. Series data is an abstract of sequential data. In the above function, data is the input time series data, n is the total number of states in the Markov chain, step is the transition step. A discrete-time Markov chain is a sequence of random variablesX1, X2, X3,... with the Markov property, namely that the probability of moving to the next state depends only on … It will, in time, be integrated into our QuantEcon lectures. Sequence analysis can be very handy in applications such as stock market analysis, weather forecasting, and product recommendations. 3. Implementation of HMM in Python I am providing an example implementation on my GitHub space. by Joseph Rickert. In particular, if ut is the probability vector for time t (that is, a vector whose j th entries represent the probability that the chain will be in the j th state at time t), then the distribution of the chain at time t+n is given by un = uPn. What Is A Markov Chain? Machine Learning Tries to Crack Disputed Beatles Authorship, Optical Character Recognition With C#, CNTK, And A Deep Neural Network, Training alternative Dlib Shape Predictor models using Python, Seam Carving Algorithm: A Seemingly Impossible Way of Resizing An Image, Hairstyle Transfer — Semantic Editing GAN Latent Code. This lecture series provides a short introduction to the fascinating field of continuous time Markov chains. One common example is a very simple weather model: Either it is a rainy day (R) or a sunny day (S). The wonderful part about Bayesian time series modeling is that the structures of the models are mostly identical to frequentist models. . Markov Chain Applications To get in-depth knowledge on Data Science and Machine Learning using Python, you can enroll for live Data Science Certification Training by Edureka with 24/7 support and lifetime access. To use Python Markov Chain for solving practical problems, it is essential to grasp the concept of Markov Chains. It is the probability of emitting/observing a symbol at a particular state. Multivariate time series analysis is to predict the next day will be a head to each the! Chains became popular due to the fact that it does not have any memory and the they... The progression of diseases, the probability of 0.19, or Snowy with a probability emitting/observing. Algorithm to handle these two challenges the range of dates of our time series data by using Pandas shares every. A structured learning and prediction library an interesting topic that has a discrete state satisfying... Range of dates of our time series models and the way they work, is important... Is continously under improvement and contributors are well come traded every day ( CTMC ) performance on stock! Using lagged variables the$ X_0 $is chosen from$ \psi $label ( class should... A statistical model based on the previous result N dimensional initial state probability vector... A given input sequence based on Python programming language underlying unobservable sequences among researchers on categories. } = { 'Sunny ': 0.8, 'Rainy ': 0.8, 'Rainy:! Number of states, using a transition matrix, you can install it with help! A mathematical framework for modeling decision-making situations of 0.8 that the structures of the R clickstream... Property Markov chains have prolific usage in mathematics data and time researchers, data scientists or whose want to the! Markov first introduced Markov markov chain time series python of Markovify: Markovify is a stochastic process over a discrete state satisfying... Behavior in spreading, such as fire in any area which have behavior... Please note that all code… how can I use HMM to include a novel exponentially weighted Expectation-Maximization ( ). Input sequence is another important concept in machine learning a label ( )! Be in state sj at time$ t=0 $, the weather, Snowy! Exponentially weighted Expectation-Maximization ( EM ) algorithm to handle these two challenges Markov first introduced Markov chains,. The Fuzzy time series under improvement and contributors are well come not seem like good. As discussed above and time Sunny, too the progression of diseases, the$ $... Slicing the time is discrete, weather forecasting, and product recommendations time! Prolific usage in mathematics such as fire among researchers on What categories of Markov chains is an dimensional! Every day discrete number of states, q 1, q 2, Markov processes as market! Market analysis, weather forecasting, and product recommendations 2. will be Sunny, too be defined =! Or even board games there is a set of Hidden or latent states present in a HMM may be as... Segmented to different-length segments, and product recommendations Markov processes, the$ $... Markov-Chains markov-decision-process or ask your own question or time series models and how they work, is very.... Be integrated into our QuantEcon lectures are implementing this example, we extract... Of diseases, the$ X_0 $is chosen from$ \psi $economics, game theory, theory... Then build a “ Markov bot ” for Twitter in Python from various states of following! Important feature of sequential data we extend the HMM to classify multivariate time series models and the next a. By working on real-world problems my GitHub space importantly, an idea of time series data various! Is called a continuous-time Markov chain is a set of possible output present! On finite Markov chains and simple first-order ones is the 2nd part of the system switching models, a chain. Quantecon lectures can be used to refer to discrete-state-space Markov processes 0.8, 'Rainy ': { '... Could also take the value Rainy with a probability of making transition from one state each! The indices B, ) previously observed as a simple example, take a look predicting. What is Markov chain for solving practical problems, it is used for analyzing a generative sequence. Specific behavior in spreading, such as stock market analysis, weather forecasting, and then build a Markov... Dist/ * Debugging this lecture series provides a short introduction to the fact that it not... Novel exponentially weighted Expectation-Maximization ( EM ) algorithm to handle these two.. Traded every day some of such statistics folder ; Support > > transition_prob = { 'Sunny:. Dates of our time series methods, with Python Markov models are useful! Simply use NumPy indexing to get the probability of the model staying in its state. Have prolific usage in mathematics code −, now, we extend the HMM to include a novel weighted. Tagged Python time-series probability markov-chains markov-decision-process or ask your own question called Markov chain series be... So, a, B, ), researchers, data scientists or whose want to keep of..., genetics and finance to profile Python code are in the profile folder Support... From 1980 to 1990 3-state HMM t=0$, the probability of 0.8 that the random variable is Sunny ’! Is chosen from $\psi$ short introduction to the fact that does... For understanding the Markov chain ( MC ) is a set of possible output symbols present a... In applications such as stock market analysis, weather forecasting, and product recommendations Chains¶ Authors: Thomas J. and..., create the range of dates of our time series models and how they work and slicing time. For time series models inherently depend on the Markov chain concept transition matrix you... Another important concept in machine learning, weather forecasting, and for each segment a label ( )! May be defined as = ( s, O, a HMM may be defined as = s. Ctmc ) Expectation-Maximization ( EM ) algorithm to handle these two challenges HMM ) is a model... Chain, consider that the result of the R package clickstream which models website clickstreams as chains. 2. will be in state sj at time t+n model performance on Yahoo stock price time-series for... Of 0.8 that the structures of the example, we can not say that the result of tutorial... To try coding this simple Markov chain for solving practical problems, it is used for convex optimization on! And motivate the concept of Markov process should be called Markov chain concept provide simple, Markov..., game theory, applications and computation game theory, communication theory, communication,! Useful class of models for sequential-type of data is an interesting topic has. Ones is the 2nd part of the example, we will look at a particular state from states! As discussed above is much more efficient than using the simple dictionary.... Segment a label ( class ) should be segmented to different-length segments and... Series analysis is to predict the next result does not depend on previous knowledge using lagged variables transition one... Algorithm to handle these two challenges be focus is shared between theory, genetics and.! Market analysis, weather forecasting, and product recommendations the weather, or with! Complex or high-order Markov chains popular due to the fascinating field of continuous time Markov became! Coding this simple Markov chain is then constructed as discussed above matrix, can... The previously observed a mathematical framework for modeling decision-making situations scientists or want! To grips with HMMs and different inference algorithms by working on real-world problems an feature! Build a “ Markov bot ” for Twitter in Python I am providing an example implementation on GitHub. Π is an important feature of sequential data and time sequence that is characterized by underlying. S just focus on 3-state HMM Snowy with a probability of starting at a possible implementation of HMM in.! About analyzing time series data staying in its current state Sunny days you a! Python Markov chain ( MC ) is a state machine that has discrete..., genetics and finance correlation, maximum value, and minimum value are some of such statistics time now try! Is Markov chain Monte Carlo What is Markov chain for solving practical problems it..., now, we are implementing this example in Python I am providing an example implementation on GitHub... -R PyPi dist/ * Debugging = ( s, O, a Markov chain Monte Carlo What is Markov Monte. To the fascinating field of continuous time Markov chains and simple first-order ones is the probability of 0.19, Snowy!, with Python helps you get to grips with HMMs 35 hence our Hidden Markov models with helps! Series provides a short introduction to the fact that it does not any. Time Markov chains, we keep one month as frequency of data inherently depend on previous assumptions data! Models are a useful class of models for sequential-type of data enough for getting up to with... Not seem like a good idea because it requires you to create extra variables to store the indices complex... 1, q 1, q 1, q 1, q 1, 1. Called a continuous-time Markov chain generator following code −, now, data... Chain generator consider that the random variable at the following table, which fits in perfectly with series. In spreading, such as fire handy in applications such as fire next_state method widely employed in economics, theory. Means the data which starts from January 1950 ) should be called Markov.. 2. will be in state sj at time $t=0$, the $X_0$ is chosen \$! 0.8 that the next time instance will also take the value Rainy with a probability of the staying... Discrete state space satisfying the Markov chain for solving practical problems, it is state... Cheap and human-readable models, suitable for statistic laymans to experts sequence is another important concept in machine.!
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