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05 Machine Learning

Machine Learning - Exercise

This workflow shows a hands-on exercise in the L1-DS Introduction to KNIME Analytics Platform for Data Scientists - Basics course

Task 1: Linear Regression1. Read the adult_joined.table file by executing the Table Reader and Missing Value nodes2. Partition the data into a training set (75 %) and test set (25 %). Draw randomly.3. Train a linear regression model on the training set to predict the weekly working hours. Use all other columns except the"ID" column for the prediction.4. Apply the model to the test set5. Evaluate the performance of the linear regression model with the Numeric Scorer node Task 2: Decision Tree Model1. Use the same dataset as in task 1 and partition it into a training set (75%) and a test set (25%). Apply stratified samplingto the income column.2. Train a decision tree model on the training set to predict whether or not a person earns more than 50K per year3. Apply the model to the test set4. Evaluate the accuracy of the model with scoring metrics5. Open the configuration dialog of the Scorer (JavaScript) node and exclude those statistics from the class predictionstatistics table that are also present in the confusion matrix. Display the number of rows in the confusion matrix. 6. Evaluate the performance of the model with an ROC curve7. OPTIONAL: Try out other parameter settings to reach a better performance. For example, change the quality measure,pruning method, or minimum number of records. Read data adult_joined.tableNode 13Node 14Node 15Node 16Node 17Node 18Node 19Node 20Node 21 Missing Value Table Reader Partitioning Linear RegressionLearner RegressionPredictor Numeric Scorer Partitioning DecisionTree Learner Decision TreePredictor Scorer (JavaScript) ROC Curve Task 1: Linear Regression1. Read the adult_joined.table file by executing the Table Reader and Missing Value nodes2. Partition the data into a training set (75 %) and test set (25 %). Draw randomly.3. Train a linear regression model on the training set to predict the weekly working hours. Use all other columns except the"ID" column for the prediction.4. Apply the model to the test set5. Evaluate the performance of the linear regression model with the Numeric Scorer node Task 2: Decision Tree Model1. Use the same dataset as in task 1 and partition it into a training set (75%) and a test set (25%). Apply stratified samplingto the income column.2. Train a decision tree model on the training set to predict whether or not a person earns more than 50K per year3. Apply the model to the test set4. Evaluate the accuracy of the model with scoring metrics5. Open the configuration dialog of the Scorer (JavaScript) node and exclude those statistics from the class predictionstatistics table that are also present in the confusion matrix. Display the number of rows in the confusion matrix. 6. Evaluate the performance of the model with an ROC curve7. OPTIONAL: Try out other parameter settings to reach a better performance. For example, change the quality measure,pruning method, or minimum number of records. Read data adult_joined.tableNode 13Node 14Node 15Node 16Node 17Node 18Node 19Node 20Node 21 Missing Value Table Reader Partitioning Linear RegressionLearner RegressionPredictor Numeric Scorer Partitioning DecisionTree Learner Decision TreePredictor Scorer (JavaScript) ROC Curve

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To use this workflow in KNIME, download it from the below URL and open it in KNIME:

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Created by: Maarit Laukkanen
Created at: 2020-04-20
On NodePit since: 2023-06-19
Last update: 2024-04-27
Created with KNIME version: v4.7.2
Tags: r-squarederror metriclinear regressiondecision treescoring metricsROCeducation

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