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Introduction to Deep Learning

Describe Reinforcement Learning

Agent learns by reward

Introduction to Deep Learning

How does the k-NN Algorithm work?

A classifier that looks at the distance of k neighbors:

1. Load the data

2. Initialise the value of k

3. For gettin the predicted class, iterate from 1 tot toal number of training data points

3.1. Calculate the distance between test data and each row of training data (e.g. Euclidean Distance)

3.2. Add the distance and the index of the example to an ordered collection

4. Sort the calculated distances in ascending order based on distance values

5. Get top k rows from the sorted array

6. Get the most frequent class of theses rows

7. Return the predicted class

8. If regression: return the mean of the K; else: return the mode of the K Labels

Introduction to Deep Learning

What does Cross Validation do?

It tests the effectiveness of a machine learning model: Under-, Over-fitting or Well generalised

Introduction to Deep Learning

How can we prevent our model from overfitting?

Regularization

Introduction to Deep Learning

What is a problem with Gradient Descent?

We can only determine the local minimum and Neural Networks are non-convex -> there are many local minima

But this can be good enough to solve our problem.

Introduction to Deep Learning

What does the analogy "AI is the new electricity" refer to?

Similar to electricity starting about 100 years ago, AI is transforming multiple industries

Introduction to Deep Learning

When an experienced deep learning engineer works on a new problem, they can usually use insight from previous problems to train a good model on the first try, without needing to iterate multiple times through different models.

False

Introduction to Deep Learning

A demographic dataset with statistics on different cities' population, GPD per capita, economic growth is an example of "unstructured" data because it contains data coming from different sources.

False

Introduction to Deep Learning

Why is a Recurrent Neural Network (RNN) used for machine translation?

It can be traiend as a supervised learning problem

Introduction to Deep Learning

What does a neuron compute?

A neuron computes the mean of all features before applying the output to an activation function

Introduction to Deep Learning

Which of the following are true?

X is a matrix in which each column is one training example

Introduction to Deep Learning

During forward propagation, in the forward function for a layer l you need to know what is the activation function in a layer (Sigmoid, tanh, ReLU, etc.). During backpropagation, the corresponding backward function also needs to know what is the activation function for layer l, since the gradient depends on it.

True

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