RNNs Basics

Respond to the following questions

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Q1 The figure below shows a RNN with one input unit x, one logistic hidden unit h, and one linear output unit y. The Network parameters are Wxh=-0,1, Whh=0.5 and Why=0.25, hbias=0.4 and ybias=0.0. The input takes the values 18, 9, -8 at time steps 0,1 and 2.

1 point

The RNN is unrolled for time steps T=0,1 and 2

The figure does only shows time propagation but not space propagation

The RNN is not unrolled

Q2 The logistic regression corresponds to the following equation

1 point

f(x)=tanh(x)

f(x)=1/(1+e^(-x))

f(x)=1/(1+e^(x))

None of the above

Q3 Compute the hidden unit value h0

1 point

0.1

0.3

0.2

None of the above

Q4 The output unit values...

0 points

The output unit value y1 is 0.05

The output unit value y2 is 0.2

The output unit value y3 is 0.1

Q5 Consider the following RNN

1 point

The RNN has two input units, two hidden units and one output unit

The RNN has two input units, two time-steps units and one loss unit

The RNN has two input units, two time-steps units and one output unit

Q6 For the image from previous question, every arrow denotes the effect of a variable at time t on a variable at time t+1. Which feed forward Neural Network is equivalent to this network unrolled in time?

1 point

Option 1

Option 2

Option 3

Option None of the above

Q7 Mark all statements that are true

1 point

Vanishing gradients can only be solved by regularization

Exploiding gradients and vanishing gradients can happen when training RNNs with backpropagation through time

The goal of BPTT is to calculate the gradients of the error with respect to the parameters of the RNN which is only the matrix of weights through time

The matrix of weights W in a RNNs is different at each time step

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