CS325 Topic 7, Lectures 1,2,3,4

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1
What is machine learning?
The study of computer algorithms that improve automatically through experience and by the use of data.
2
What is a model in computer science?
A specification of a mathematical or probabilistic relationship between different variables in a dataset.
3
What is over-fitting?
A modeling error where the model performs well on the training data but poorly on new unseen data.
4
What is under-fitting?
A modeling error where the model does not perform well on the training data, leading to poor generalization.
5
What is bias in modeling?
The difference between the average prediction of the model and the true value, often leading to oversimplification and high prediction error.
6
What is variance in modeling?
The variability of model predictions for a given dataset, which leads to poor performance on new data.
7
What is a confusion matrix?
A method used to evaluate the performance of a classification model by measuring the correctness of its predictions.
8
What does TP (True Positive) mean in a confusion matrix?
It refers to correctly predicting a positive class, such as identifying a sick person who is actually sick.
9
What does FP (False Positive) mean in a confusion matrix?
It refers to incorrectly predicting a positive class, like diagnosing a healthy person as sick.
10
What is k-NN (k-nearest neighbor) used for?
It is a classifier that predicts new data points based on the closest neighbors in an existing dataset.
11
What is the curse of dimensionality?
As the number of features increases, modeling error increases exponentially, making the algorithm less effective.
12
What is Naive Bayes?
A machine learning algorithm that classifies categorical outcomes based on conditional probability, assuming all features are independent.
13
What is simple linear regression (SLR)?
An algorithm that predicts a continuous numerical value based on the relationship between one input and one output variable.
14
What is the dependent variable in SLR?
The output variable whose value is predicted based on the independent variable.
15
What is the independent variable in SLR?
The input variable that explains or predicts changes in the dependent variable.

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