Book Image

Numerical Computing with Python

By : Pratap Dangeti, Allen Yu, Claire Chung, Aldrin Yim, Theodore Petrou
Book Image

Numerical Computing with Python

By: Pratap Dangeti, Allen Yu, Claire Chung, Aldrin Yim, Theodore Petrou

Overview of this book

Data mining, or parsing the data to extract useful insights, is a niche skill that can transform your career as a data scientist Python is a flexible programming language that is equipped with a strong suite of libraries and toolkits, and gives you the perfect platform to sift through your data and mine the insights you seek. This Learning Path is designed to familiarize you with the Python libraries and the underlying statistics that you need to get comfortable with data mining. You will learn how to use Pandas, Python's popular library to analyze different kinds of data, and leverage the power of Matplotlib to generate appealing and impressive visualizations for the insights you have derived. You will also explore different machine learning techniques and statistics that enable you to build powerful predictive models. By the end of this Learning Path, you will have the perfect foundation to take your data mining skills to the next level and set yourself on the path to become a sought-after data science professional. This Learning Path includes content from the following Packt products: • Statistics for Machine Learning by Pratap Dangeti • Matplotlib 2.x By Example by Allen Yu, Claire Chung, Aldrin Yim • Pandas Cookbook by Theodore Petrou
Table of Contents (21 chapters)
Title Page
Contributors
About Packt
Preface
Index

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, the 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...