decisiontree | ID3-based implementation of the ML Decision Tree algorithm | Machine Learning library
kandi X-RAY | decisiontree Summary
kandi X-RAY | decisiontree Summary
ID3-based implementation of the ML Decision Tree algorithm
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- 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
decisiontree Key Features
decisiontree Examples and Code Snippets
Community Discussions
Trending Discussions on decisiontree
QUESTION
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:
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)
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 05:00No 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.
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.
QUESTION
I have a directory of images and am taking them in like this:
...ANSWER
Answered 2021-Apr-22 at 16:27One 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.
QUESTION
I have a couple of regression models that I cannot load. This is the Spark init:
...ANSWER
Answered 2021-Mar-29 at 20:13The 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:
QUESTION
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 17:37The 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.
QUESTION
I have the following code
...ANSWER
Answered 2020-Oct-15 at 16:17sklearn.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:
QUESTION
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 08:42You have stored your models in a list of tuples (note that in your example the closing bracket is actually missing):
QUESTION
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 12:57Your 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.
QUESTION
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 10:381. 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:
QUESTION
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 15:18Per the docs, splitter
must be either "best" or "random".
QUESTION
#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 17:28The cause is mentioned in the error stack trace.
ModuleNotFoundError: No module named 'numpy'
You just need to install numpy
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