What kind of task predicts a category, such as "spam" or "not spam"?
AnswerClassification
Classification assigns inputs to discrete categories; regression predicts numbers.
AI · Facts & stats
ML facts & stats
7 fact-checked facts about machine learning, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
In reinforcement learning, an agent learns mainly from what?
AnswerRewards and penalties for its actions
A reinforcement learning agent tries actions and adjusts to earn more reward over time.
Going deeper
What is overfitting?
AnswerFitting training data so closely it does poorly on new data
An overfit model memorizes noise in its training data instead of learning general patterns.
In model training, what is an "epoch"?
AnswerOne full pass through the training data
An epoch means the model has seen every training example once.
What does the activation function name ReLU stand for?
AnswerRectified Linear Unit
ReLU outputs the input if it is positive and zero otherwise.
Expert level
How is precision calculated for a classifier?
AnswerTrue positives ÷ (true positives + false positives)
Precision is the share of predicted positives that are truly positive; true positives ÷ (true positives + false negatives) is recall.
Who introduced the perceptron, an early artificial neural network, in 1958?
AnswerFrank Rosenblatt
Frank Rosenblatt's perceptron was a simple learning unit that inspired later neural networks.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round