decisiontree | ID3-based implementation of the ML Decision Tree algorithm | Machine Learning library

 by   igrigorik Ruby Version: v0.5.0 License: No License

kandi X-RAY | decisiontree Summary

kandi X-RAY | decisiontree Summary

decisiontree is a Ruby library typically used in Artificial Intelligence, Machine Learning applications. decisiontree has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.

ID3-based implementation of the ML Decision Tree algorithm
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            kandi-support Support

              decisiontree has a medium active ecosystem.
              It has 1376 star(s) with 137 fork(s). There are 40 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 7 open issues and 15 have been closed. On average issues are closed in 248 days. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of decisiontree is v0.5.0

            kandi-Quality Quality

              decisiontree has 0 bugs and 3 code smells.

            kandi-Security Security

              decisiontree has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              decisiontree code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              decisiontree does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

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              decisiontree releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.
              decisiontree saves you 222 person hours of effort in developing the same functionality from scratch.
              It has 544 lines of code, 30 functions and 9 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed decisiontree and discovered the below as its top functions. This is intended to give you an instant insight into decisiontree implemented functionality, and help decide if they suit your requirements.
            • Determines if the data matches the given data .
            • Builds the children of the tree
            • Calculate the data for the given data
            • Creates a new tuples instance of attributes
            • Builds the attributes of this node
            • Determines the value of the data for the given attribute .
            • Performs an expression on a node .
            • Prune the rules for each rule
            • Returns a string representation of the criteria
            • Generate graph of the graph
            Get all kandi verified functions for this library.

            decisiontree Key Features

            No Key Features are available at this moment for decisiontree.

            decisiontree Examples and Code Snippets

            No Code Snippets are available at this moment for decisiontree.

            Community Discussions

            QUESTION

            Question regarding DecisionTreeClassifier
            Asked 2021-May-14 at 05:10

            I am making an explainable model with the past data, and not going to use it for future prediction at all.

            In the data, there are a hundred X variables, and one Y binary class and trying to explain how Xs have effects on Y binary (0 or 1).

            I came up with DecisionTree classifier as it clearly shows us that how decisions are made by value criterion of each variable

            Here are my questions:

            1. Is it necessary to split X data into X_test, X_train even though I am not going to predict with this model? ( I do not want to waste data for the test since I am interpreting only)

            2. After I split the data and train model, only a few values get feature importance values (like 3 out of 100 X variables) and rest of them go to zero. Therefore, there are only a few branches. I do not know reason why it happens.

            If here is not the right place to ask such question, please let me know.

            Thanks.

            ...

            ANSWER

            Answered 2021-May-14 at 05:00
            1. No it is not necessary but it is a way to check if your decision tree is overfitting and just remembering the input values and classes or actually learning the pattern behind it. I would suggest you look into cross-validation since it doesn't 'waste' any data and trains and tests on all the data. If you need me to explain this further, leave a comment.

            2. Getting any number of important features is not an issue since it does depend very solely on your data.
              Example: Let's say I want to make a model to tell if a number will be divisible by 69 (my Y class).
              I have my X variables as divisibility by 2,3,5,7,9,13,17,19 and 23. If I train the model correctly, I will get feature importance of only 3 and 23 as very high and everything else should have very low feature importance.
              Consequently, my decision tree (trees if using ensemble models like Random Forest / XGBoost) will have less number of splits. So, having less number of important features is normal and does not cause any problems.

            Source https://stackoverflow.com/questions/67528915

            QUESTION

            Convert Tensorflow BatchDataset to Numpy Array with Images and Labels
            Asked 2021-Apr-22 at 16:27

            I have a directory of images and am taking them in like this:

            ...

            ANSWER

            Answered 2021-Apr-22 at 16:27

            One way to convert an image dataset into X and Y NumPy arrays are as follows:

            NOTE: This code is borrowed from here. This code is written by "PARASTOOP" on Github.

            Source https://stackoverflow.com/questions/66975191

            QUESTION

            Fail loading a ML PySpark model
            Asked 2021-Mar-29 at 20:17

            I have a couple of regression models that I cannot load. This is the Spark init:

            ...

            ANSWER

            Answered 2021-Mar-29 at 20:13

            The error message is not very helpful, but I think the correct way to load the model back is to call the load method of the model, not of the estimator. The model is fitted to the data already, which is different from the estimator, which only contains the settings/parameters, but is not fitted.

            So you can try this:

            Source https://stackoverflow.com/questions/66860936

            QUESTION

            DecisiontreeClassifier, why is the sum of values wrong?
            Asked 2021-Mar-26 at 17:38

            I visualized my decisiontreeclassifier and I noticed, that the sum of samples are wrong or formulated differently the 'value' value does not fit with the value of the samples(Screenshot)? Do I misinterpret my Decisiontree? I thought if got 100 samples in my node and 40 are True and 60 are False, I got in my next node 40 (or 60) samples which are divided again...

            ...

            ANSWER

            Answered 2021-Mar-26 at 17:37

            The plot is correct.

            The two values in value are not the number of samples to go to the children nodes; instead, they are the negative and positive class counts in the node. For example, 748=101+647; there are 748 samples in that node, 647 of which are positive class. The child nodes have 685 and 63 samples, and 685+63=647. The left child has 47 of the negative samples, and the right node 54, and 47+54=101, the total number of negative samples.

            Source https://stackoverflow.com/questions/66814510

            QUESTION

            Why does cross_val_score return several scores?
            Asked 2020-Oct-15 at 16:27

            I have the following code

            ...

            ANSWER

            Answered 2020-Oct-15 at 16:17

            sklearn.model_selection.cross_val_score gives you the score evaluated by cross validation, which means that it uses K-fold cross validation to fit and predict using the input data. The result is hence an array of k scores, resulting from each of the folds. You have an array of 5 values because cv defaults to that value, but you can modify it to others.

            Here's an example using the iris dataset:

            Source https://stackoverflow.com/questions/64375374

            QUESTION

            GridSearchCV for multiple models
            Asked 2020-Aug-10 at 08:42

            I'm trying to create a GridSearch CV function that will take more than one model. However, I've the following error: TypeError: not all arguments converted during string formatting

            ...

            ANSWER

            Answered 2020-Aug-10 at 08:42

            You have stored your models in a list of tuples (note that in your example the closing bracket is actually missing):

            Source https://stackoverflow.com/questions/63332854

            QUESTION

            GridSearchCV best hyperparameters don't produce best accuracy
            Asked 2020-Jun-22 at 12:57

            Using the UCI Human Activity Recognition dataset, I am trying to generate a DecisionTreeClassifier Model. With default parameters and random_state set to 156, the model returns the following accuracy:

            ...

            ANSWER

            Answered 2020-Jun-22 at 12:57

            Your implicit assumption that the best hyperparameters found during CV should definitely produce the best results on an unseen test set is wrong. There is absolutely no guarantee whatsoever that something like that will happen.

            The logic behind selecting hyperparameters this way is that it is the best we can do given the (limited) information we have at hand at the time of model fitting, i.e. it is the most rational choice. But the general context of the problem here is that of decision-making under uncertainty (the decision being indeed the choice of hyperparameters), and in such a context, there are no performance guarantees of any kind on unseen data.

            Keep in mind that, by definition (and according to the underlying statistical theory), the CV results are not only biased on the specific dataset used, but even on the specific partitioning to training & validation folds; in other words, there is always the possibility that, using a different CV partitioning of the same data, you will end up with different "best values" for the hyperparameters involved - perhaps even more so when using an unstable classifier, such as a decision tree.

            All this does not of course mean either that such a use of CV is useless or that we should spend the rest of our lives trying different CV partitions of our data, in order to be sure that we have the "best" hyperparameters; it simply means that CV is indeed a useful and rational heuristic approach here, but expecting any kind of mathematical assurance that its results will be optimal on unseen data is unfounded.

            Source https://stackoverflow.com/questions/62491771

            QUESTION

            GridSearchCV is not fitted yet error when using export_graphiz despite having fitted it
            Asked 2020-Jun-03 at 10:38

            So I trained a Decision Tree classifier model and I am using the GridSearchCV output to plot the tree plot. Here is my code for the decision tree model:

            ...

            ANSWER

            Answered 2020-Jun-03 at 10:38

            1. You have missed something elsewhere cause the object is indeed fitted. To check that use check_is_fitted().

            2.You need to pass the best estimator to the export_graphviz()and not the Gridsearch i.e. export_graphviz(dt_clf.best_estimator_)

            Example:

            Source https://stackoverflow.com/questions/62170607

            QUESTION

            Python Scikit-Learn DecisionTreeClassifier.fit() throws KeyError: 'default'
            Asked 2020-Feb-26 at 15:19

            I have a small dataset and am trying to use sklearn to create a decision tree classifier. I use sklearn.tree.DecisionTreeClassifier as the model and use its .fit() function to fit to the data. Searching around, I could not find anyone else who has run into the same issue.

            After loading in the data into one array and labels into another, printing out the two arrays (data and labels) gives:

            ...

            ANSWER

            Answered 2020-Feb-26 at 15:18

            Per the docs, splitter must be either "best" or "random".

            Source https://stackoverflow.com/questions/60417050

            QUESTION

            Error on fitting RDD data on decision tree classifier
            Asked 2020-Feb-24 at 17:28
            #load dataset
            df = spark.sql("select * from ws_var_dataset2")
            def labelData(data):
                # label: row[end], features: row[0:end-1]
                return data.map(lambda row: LabeledPoint(row[-1], row[:-1]))
            training_data, testing_data = labelData(df.rdd).randomSplit([0.8, 0.2], seed=12345)
            
            ...

            ANSWER

            Answered 2020-Feb-24 at 17:28

            The cause is mentioned in the error stack trace.

            ModuleNotFoundError: No module named 'numpy'

            You just need to install numpy

            Source https://stackoverflow.com/questions/60196772

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install decisiontree

            You can download it from GitHub.
            On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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