Data Transformation in AI

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Questions and Answers

What is the main goal of data cleaning in data transformation?

To remove incorrect or incomplete information from the dataset (correct)
To improve the accuracy of predictions
To reduce the number of features
To add extra information to the dataset

What type of data transformation technique is used to reduce a large amount of information down to a smaller set of more useful variables?

Data aggregation
Data normalization
Data creation
Feature extraction (correct)

What is the purpose of feature creation in data transformation?

To reduce the number of features
To add extra information to the dataset (correct)
To improve the accuracy of predictions
To remove irrelevant data

Which of the following is NOT a type of data transformation technique?

Data compression (D) Signup and view all the answers

What is the result of not performing data transformation on a dataset?

Inaccurate predictions (A) Signup and view all the answers

What is the purpose of data normalization in data transformation?

To scale the data to a common range (B) Signup and view all the answers

Why is data cleaning often the most time-consuming step in data transformation?

Because errors can occur due to human error, software bugs, or missing data (D) Signup and view all the answers

What is an example of feature creation in a dataset of photos?

Adding a timestamp to each photo (B) Signup and view all the answers

What is the primary purpose of data transformation in machine learning?

To ensure the data is clean and ready for use (B) Signup and view all the answers

What is the term used to describe the process of making sure the data is clean and ready to be used by a machine learning algorithm?

All of the above (D) Signup and view all the answers

What type of learning involves training an agent to make a sequence of decisions by interacting with an environment?

Reinforcement learning (B) Signup and view all the answers

What is the primary source of data for machine learning algorithms?

Various sources, including images, text, time series data, and more (A) Signup and view all the answers

What is the term used to describe a combination of supervised and unsupervised learning?

Semi-supervised learning (D) Signup and view all the answers

What is the purpose of data transformation in the machine learning lifecycle?

To prepare the data for use in the machine learning algorithm (A) Signup and view all the answers

What type of learning is used to group customers into different market segments?

Unsupervised learning (A) Signup and view all the answers

What is the purpose of data normalization?

To make sure all values in a dataset are on the same scale (D) Signup and view all the answers

What is the term used to describe the process of organizing computing clusters?

Unsupervised learning (A) Signup and view all the answers

What is the result of Min-Max normalization?

Values scaled to a range between 0 and 1 (A) Signup and view all the answers

What is the purpose of data aggregation?

To combine multiple datasets into one (D) Signup and view all the answers

What is Z-score normalization used for?

To scale the values of a feature to have a mean of 0 and a standard deviation of 1 (C) Signup and view all the answers

What is data disaggregation?

The process of splitting one large dataset into several smaller ones (C) Signup and view all the answers

Why is data normalization necessary?

To ensure that all values in a dataset are on the same scale (B) Signup and view all the answers

What is the goal of data transformation techniques?

To prepare data for analysis and modeling (D) Signup and view all the answers

When is data aggregation used?

When working with data from different sources (B) Signup and view all the answers

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Study Notes

Data Transformation

Data transformation is a crucial step in machine learning, as it enables accurate predictions.
There are various types of data transformation, depending on the type of data and the desired outcome.

Types of Data Transformation

Data Cleaning: removing incorrect or incomplete information, handling missing values, and dealing with outliers or extreme values.
Feature Extraction: reducing a large amount of information to a smaller set of more useful variables, using techniques like Principal Component Analysis (PCA) or t-SNE.
Feature Creation: adding extra information to the dataset, making use of data that would otherwise be ignored, and improving the accuracy of predictions.
Data Normalization: making sure all values in the dataset are on the same scale, often used with numerical data.
Data Aggregation: combining multiple datasets into one, often used when working with data from different sources.
Data Disaggregation: splitting one large dataset into several smaller ones, often used to split aggregated data into smaller datasets.

Data Normalization Techniques

Min-Max Normalization: scaling values to a range between 0 and 1 by subtracting the minimum value and dividing by the range of the feature.
Z-Score Normalization: scaling values to have a mean of 0 and a standard deviation of 1 by subtracting the mean and dividing by the standard deviation.

Unsupervised Learning

Examples: discovering market segments, grouping customers into different market segments, and grouping news articles into sets of articles about the same story.

Machine Learning Approaches

Supervised Learning: involves training a model on labeled data to make predictions.
Unsupervised Learning: involves training a model on unlabeled data to discover patterns or relationships.
Reinforcement Learning: involves training an agent to make a sequence of decisions by interacting with an environment.
Hybrid Approaches: combining supervised and unsupervised learning, such as semi-supervised learning and reinforcement learning.

ML Life Cycle

Data: the heart of every machine learning algorithm, comes in various shapes and sizes, and must be transformed before use in a machine learning project.