Wanneer hoef je je data niet te transformeren?

Hoewel het voor de meeste analyses aan te raden is om al je data op dezelfde schaal te zetten, voor welk van de volgende Machine Learning-modellen is normaliseren van data niet altijd nodig?

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Feature engineering voor Machine Learning in Python

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Deze oefening maakt deel uit van de cursus

Feature engineering voor Machine Learning in Python

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In this chapter, you will explore what feature engineering is and how to get started with applying it to real-world data. You will load, explore and visualize a survey response dataset, and in doing so you will learn about its underlying data types and why they have an influence on how you should engineer your features. Using the pandas package you will create new features from both categorical and continuous columns.

Exercise 1: Why generate features?Exercise 2: Getting to know your data Exercise 3: Selecting specific data types Exercise 4: Dealing with categorical features Exercise 5: One-hot encoding and dummy variables Exercise 6: Dealing with uncommon categories Exercise 7: Numeric variables Exercise 8: Binarizing columns Exercise 9: Binning values

This chapter introduces you to the reality of messy and incomplete data. You will learn how to find where your data has missing values and explore multiple approaches on how to deal with them. You will also use string manipulation techniques to deal with unwanted characters in your dataset.

Exercise 1: Why do missing values exist?Exercise 2: How sparse is my data?Exercise 3: Finding the missing values Exercise 4: Dealing with missing values (I)Exercise 5: Listwise deletion Exercise 6: Replacing missing values with constants Exercise 7: Dealing with missing values (II)Exercise 8: Filling continuous missing values Exercise 9: Imputing values in predictive models Exercise 10: Dealing with other data issues Exercise 11: Dealing with stray characters (I)Exercise 12: Dealing with stray characters (II)Exercise 13: Method chaining

In this chapter, you will focus on analyzing the underlying distribution of your data and whether it will impact your machine learning pipeline. You will learn how to deal with skewed data and situations where outliers may be negatively impacting your analysis.

Exercise 1: Data-verdelingen Exercise 2: Hoe zien je data eruit? (I)Exercise 3: Hoe zien je gegevens eruit? (II)Exercise 4: Wanneer hoef je je data niet te transformeren?

Huidige oefening

Exercise 5: Schalen en transformaties Exercise 6: Normalisatie Exercise 7: Standaardiseren Exercise 8: Logtransformatie Exercise 9: Wanneer kun je normalisatie gebruiken?Exercise 10: Uitschieters verwijderen Exercise 11: Outliers verwijderen op basis van percentage Exercise 12: Statistische verwijdering van uitschieters Exercise 13: Schaal en transformeer nieuwe gegevens Exercise 14: Transformaties voor train en test (I)Exercise 15: Transformaties voor trainen en testen (II)

Finally, in this chapter, you will work with unstructured text data, understanding ways in which you can engineer columnar features out of a text corpus. You will compare how different approaches may impact how much context is being extracted from a text, and how to balance the need for context, without too many features being created.

Exercise 1: Encoding text Exercise 2: Cleaning up your text Exercise 3: High level text features Exercise 4: Word counts Exercise 5: Counting words (I)Exercise 6: Counting words (II)Exercise 7: Limiting your features Exercise 8: Text to DataFrame Exercise 9: Term frequency-inverse document frequency Exercise 10: Tf-idf Exercise 11: Inspecting Tf-idf values Exercise 12: Transforming unseen data Exercise 13: N-grams Exercise 14: Using longer n-grams Exercise 15: Finding the most common words Exercise 16: Wrap-up