Neural Networks and Deep Learning Coursera Quiz Answers

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Neural Networks and Deep Learning Week 01 Quiz Answers

Q1. What does the analogy “AI is the new electricity” refer to?

Q2. Which of these are reasons for Deep Learning recently taking off? (Check the three options that apply.)

Q3. Recall this diagram of iterating over different ML ideas. Which of the statements below are true? (Check all that apply.)

Q4. 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. True/False?

Q5. Which one of these plots represents a ReLU activation function?

Q6. Images for cat recognition is an example of “structured” data because it is represented as a structured array in a computer. True/False?

Q7. A demographic dataset with statistics on different cities’ populations, GDP per capita, and economic growth is an example of “unstructured” data because it contains data coming from different sources. True/False?

Q8. Why is an RNN (Recurrent Neural Network) used for machine translation, say translating English to French? (Check all that apply.)

Q9. In this diagram which we hand-drew in lecture, what do the horizontal axis (x-axis) and vertical axis (y-axis) represent?

Q10. Assuming the trends described in the previous question’s figure are accurate (and I hope you got the axis labels right), which of the following are true? (Check all that apply.)

Neural Networks and Deep Learning Week 02 Quiz Answers

Q1. What does a neuron compute?

Q3. Suppose img is a (32,32,3) array, representing a 32×32 image with 3 color channels red, green and blue. How do you reshape this into a column vector?

Q4. Consider the two following random arrays aa and bb:

a = np. random.randn(2, 3)a=np.random.randn(2,3) # a.shape = (2, 3)a.shape=(2,3)

b = np. random.randn(2, 1)b=np.random.randn(2,1) # b.shape = (2, 1)b.shape=(2,1)

c = a + b c=a+b

What will be the shape of cc?

Q5. Consider the two following random arrays aa and bb:

a = np. random.randn(4, 3)a=np.random.randn(4,3) # a.shape = (4, 3)a.shape=(4,3)

b = np. random.randn(3, 2)b=np.random.randn(3,2) # b.shape = (3, 2)b.shape=(3,2)

c = a*bc=a∗b

What will be the shape of the cc?

Q6. Recall that X = [x^{(1)} x^{(2)} … x^{(m)}]X=[x(1)x(2)…x(m)]. What is the dimension of X?

Q7. Recall that np. dot(a,b)np.dot(a,b) performs a matrix multiplication on aa and bb, whereas a*ba∗b performs an element-wise multiplication.

Consider the two following random arrays aa and bb:

a = np. random.randn(12288, 150)a=np.random.randn(12288,150) # a.shape = (12288, 150)a.shape=(12288,150)

b = np. random.randn(150, 45)b=np.random.randn(150,45) # b.shape = (150, 45)$$

c = np.dot(a,b)c=np.dot(a,b)

What is the shape of cc?

Q8. Consider the following code snippet:

# a.shape = (3,4)a.shape=(3,4)

b.shape = (4,1)b.shape=(4,1)

for i in range(3):
for j in range(4):
c[i][j] = a[i][j] + b[j]c[i][j]=a[i][j]+b[j]

How do you vectorize this?

Q9. Consider the following code:

a = np. random.randn(3, 3)a=np.random.randn(3,3)

b = np. random.randn(3, 1)b=np.random.randn(3,1)

c = a*bc=a∗b

What will be cc? (If you’re not sure, feel free to run this in Python to find out).

1. This will multiply a 3×3 matrix a with a 3×1 vector, thus resulting in a 3×1 vector. That is, c.shape = (3,1).
2. This will invoke broadcasting, so b is copied three times to become (3,3), and *∗ is an element-wise product so c.shape will be (3, 3)
3. This will invoke broadcasting, so b is copied three times to become (3, 3), and *∗ invokes a matrix multiplication operation of two 3×3 matrices so c.shape will be (3, 3)
4. It will lead to an error since you cannot use “*” to operate on these two matrices. You need to instead use np. dot(a,b)

Q10. Consider the following computation graph.

What is the output J?

Neural Networks and Deep Learning Week 03 Quiz Answers

Q1. Which of the following are true? (Check all that apply.)

Q2. The tanh activation is not always better than the sigmoid activation function for hidden units because the mean of its output is closer to zero, and so it centers the data, making learning complex for the next layer. True/False?

Q3. Which of these is a correct vectorized implementation of forward propagation for layer l, where 1≤l≤L?

Q4. You are building a binary classifier for recognizing cucumbers (y=1) vs. watermelons (y=0). Which one of these activation functions would you recommend using for the output layer?

Q5. Consider the following code:

A = np. random.randn(4,3)B =

B = np.sum(A, axis = 1, keepdims = True)

What will be B.shape? (If you’re not sure, feel free to run this in Python to find out).

Q6. Suppose you have built a neural network. You decide to initialize the weights and biases to be zero. Which of the following statements is true?

Q7. Logistic regression’s weights w should be initialized randomly rather than to all zeros, because if you initialize to all zeros, then logistic regression will fail to learn a useful decision boundary because it will fail to “break symmetry”, True/False?

Q8. You have built a network using the tanh activation for all the hidden units. You initialize the weights to relatively large values, using np.random.randn(..,..)*1000. What will happen?

Q9. Consider the following 1 hidden layer neural network:

Which of the following statements is True? (Check all that apply).

Q10. In the same network as the previous question, what are the dimensions of Z[1] and A^{[1]}A[1]?

Neural Networks and Deep Learning Week 04 Quiz Answers

Q1. What is the “cache” used for in our implementation of forward propagation and backward propagation?

• It is used to cache the intermediate values of the cost function during training.

Q2. Among the following, which ones are “hyperparameters”? (Check all that apply.)

Q3. Which of the following statements is true?

Q4. Vectorization allows you to compute forward propagation in an LL-layer neural network without an explicit for-loop (or any other explicit iterative loop) over the layers l=1, 2, …,L. True/False?

Q5. Assume we store the values for n^{[l]} in an array called layer_dims, as follows: layer_dims = [n_xn x, 4,3,2,1]. So layer 1 has four hidden units, layer 2 has 3 hidden units, and so on. Which of the following for-loops will allow you to initialize the parameters for the model?

Q6. Consider the following neural network.

Q7. During forward propagation, in the forward function for a layer ll 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 ll, since the gradient depends on it. True/False?

Q8. There are certain functions with the following properties:

(i) To compute the function using a shallow network circuit, you will need a large network (where we measure size by the number of logic gates in the network), but (ii) To compute it using a deep network circuit, you need only an exponentially smaller network. True/False?

Q9. Consider the following 2 hidden-layer neural networks:

Which of the following statements is True? (Check all that apply).

Q10. Whereas the previous question used a specific network, in the general case what is the dimension of W^{[l]}, the weight matrix associated with layer ll?

Conclusion:

In conclusion, the Neural Networks and Deep Learning Coursera Quiz Answers provide a comprehensive understanding of key concepts and principles in the field of neural networks and deep learning. These answers not only serve as a valuable resource for learners seeking to solidify their knowledge but also offer insights into solving practical problems using deep learning techniques.

Get all Course Quiz Answers of Deep Learning Specialization

Course 01: Neural Networks and Deep Learning Coursera Quiz Answers

Course 02: Improving Deep Neural Networks: Hyperparameter tuning, Regularization and Optimization Quiz Answers

Course 03: Structuring Machine Learning Projects Coursera Quiz Answers

Course 04: Convolutional Neural Networks Coursera Quiz Answers

Course 05: Sequence Models Coursera Q