Ch12-Block Chain Technologies

There are 20 true positive predictions, 12 false positives, 2 false negatives, and 650 true negatives in the confusion matrix. What is the precision ratio?

0.625

There are 20 true positive predictions, 5 false positives, 2 false negatives, and 650 true negatives in the confusion matrix. What is the precision ratio?

0.80

There are 20 true positive predictions, 5 false positives, 2 false negatives, and 650 true negatives in the confusion matrix. What is the accuracy ratio?

0.99

there are two possible classifications, then the confusion matrix would show Blank 1Blank 1 TP , Incorrect Unavailable cells with the prediction options.

4

Which of the following is NOT true about modern neural networks?

A neural network with more than 100 layers cannot be effectively trained

In an example where the goal is to identify spam email, which of the following best describes the difference between a true positive (TP) and a false negative (FN) in a confusion matrix?

A true positive is a correct classification of a spam email message; a false negative is an incorrect classification of a spam email message

Select a wrong statement about blockchain concepts.

All transactions on a blockchain network must be verified by a central authority.

Which of the following is NOT true about the relationship between AI, machine learning, and deep learning.

Deep learning involves less complexity than machine learning

True or false: Classification problems seek to minimize the differences between predicted and actual values.

False

True or false: Supervised learning is a type of machine learning but it is seldom used in practice.

False

Which of the following is NOT a technique to train a neural network system?

Incentive-based learning

Select the best statement in describing the concept of miners in blockchain.

Miners are the nodes/machines creating and validating blocks.

Which of the following are NOT uses of natural language processing and understanding applications?

Recognize faces

published a white paper in 2008 to introduced a concept on distributed ledger system which is the

Satoshi Blank 2: Nakamoto

What is the original purpose of using a distributed ledger system with the blockchain technology?

To eliminate intermediaries/middlemen in perform transactions

PriceWaterhouseCoopers (PWC) uses machine learning to replicate the decision making of expert

auditors

List the key characteristics of blockchain technology:

distributed and decentralized Blank 2: consensus Blank 3: immutability

Robotic process automation is used to reduce the Blank 1Blank 1 direct , Incorrect Unavailable labor required.

human

you are using a confusion matrix to calculate the ratio of correct positive predictions to the total number of positive predictions; that is which of the following ratios?

precision

You are using a confusion matrix to calculate the ratio of correct positive predictions to the total number of true positive predictions; that is which of the following ratios?

recall