Week 2: AI and Big Data Quiz

Which activation function maps values to the range (-1, 1)?

• Tanh

• Softmax

• ReLU

• Sigmoid

Answer explanation

The activation function that maps values to the range (-1, 1) is Tanh.

What is the purpose of introducing non-linearity into a neural network?

• To learn complex patterns

• To simplify the model

• To make it faster

• To reduce accuracy

Answer explanation

To introduce non-linearity into a neural network is to learn complex patterns, allowing the model to capture intricate relationships in the data.

Which type of neural network is specialised for processing data with grid-like topology, such as images?

• Feedforward Neural Networks

• Deep Learning Networks

• Recurrent Neural Networks

• Convolutional Neural Networks

Answer explanation

Convolutional Neural Networks are specialized for processing data with grid-like topology, such as images.

Which data storage solution scales seamlessly as data grows and is accessible from anywhere via the internet?

• Distributed Databases

• Data Warehouses

• Cloud Storage

• Data Lakes

Answer explanation

Cloud Storage is the data storage solution that scales seamlessly as data grows and is accessible from anywhere via the internet.

What is the ultimate goal in machine learning when creating models and algorithms?

• To ignore the test data

• To memorise the training data

• To generalise to unseen data

• To overfit the training data

Answer explanation

The ultimate goal in machine learning when creating models and algorithms is to generalise to unseen data, not just memorise the training data or overfit it.

Which metric measures how many of the actual positive instances were correctly predicted by the model?

• Accuracy

• Precision

• Recall

• F1-Score

Answer explanation

The metric that measures how many of the actual positive instances were correctly predicted by the model is Recall.

Which type of data lacks a specific structure and doesn’t fit neatly into databases?

• Structured Data

• Unstructured Data

• Semi-structured Data

• Big Data

Answer explanation

Unstructured Data lacks a specific structure and doesn’t fit neatly into databases, making it the correct choice.

Which of the following best describes the purpose of an activation function in neural networks?

• To calculate the error rate

• To introduce non-linearity into the network

• To determine the number of neurons

• To optimize the learning rate

Answer explanation

To introduce non-linearity into the network

What is the primary purpose of using a Test dataset in machine learning evaluation?

• To train the model more effectively

• To fine-tune hyperparameters

• To estimate model accuracy on unknown data

• To increase the training data size

Answer explanation

To estimate model accuracy on unknown data

Which of the following is NOT typically considered a benefit of distributed databases?

• Scalability

• Fault tolerance

• Simplicity of setup and management

• Ability to handle large volumes of data

Answer explanation

The correct choice is 'Simplicity of setup and management' because distributed databases are known for their complexity in setup and management compared to centralized databases.