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Statistics for Machine Learning

You're reading from   Statistics for Machine Learning Techniques for exploring supervised, unsupervised, and reinforcement learning models with Python and R

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781788295758
Length 442 pages
Edition 1st Edition
Languages
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Author (1):
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Pratap Dangeti Pratap Dangeti
Author Profile Icon Pratap Dangeti
Pratap Dangeti
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Toc

Table of Contents (10) Chapters Close

Preface 1. Journey from Statistics to Machine Learning 2. Parallelism of Statistics and Machine Learning FREE CHAPTER 3. Logistic Regression Versus Random Forest 4. Tree-Based Machine Learning Models 5. K-Nearest Neighbors and Naive Bayes 6. Support Vector Machines and Neural Networks 7. Recommendation Engines 8. Unsupervised Learning 9. Reinforcement Learning

Decision tree classifier


The DecisionTtreeClassifier from scikit-learn has been utilized for modeling purposes, which is available in the tree submodule:

# Decision Tree Classifier 
>>> from sklearn.tree import DecisionTreeClassifier

The parameters selected for the DT classifier are in the following code with splitting criterion as Gini, Maximum depth as 5, minimum number of observations required for qualifying split is 2, and the minimum samples that should be present in the terminal node is 1:

 >>> dt_fit = DecisionTreeClassifier(criterion="gini", max_depth=5,min_samples_split=2,  min_samples_leaf=1,random_state=42) 
>>> dt_fit.fit(x_train,y_train) 
 
>>> print ("\nDecision Tree - Train Confusion  Matrix\n\n", pd.crosstab(y_train, dt_fit.predict(x_train),rownames = ["Actuall"],colnames = ["Predicted"]))    
>>> from sklearn.metrics import accuracy_score, classification_report    
>>> print ("\nDecision Tree - Train accuracy\n\n",round...
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