Neural Network

Hopfield Model-1

Question 1
Marks : +2 | -2
Pass Ratio : 17%
If connections are not symmetric then basins of attraction may correspond to oscillatory or stable regions, is that true?
yes
no
Explanation:
Asymmetric weight can’t lead to stable regions.
Question 2
Marks : +2 | -2
Pass Ratio : 33%
What is gradient descent?
method to find the absolute minimum of a function
method to find the absolute maximum of a function
maximum or minimum, depends on the situation
none of the mentioned
Explanation:
Gradient descent gives absolute minimum of a function.
Question 3
Marks : +2 | -2
Pass Ratio : 33%
What is synchronous update in hopfield model?
all units are updated simultaneously
a unit is selected at random and its new state is computed
a predefined unit is selected and its new state is computed
none of the mentioned
Explanation:
In synchronous update, all units are updated simultaneously.
Question 4
Marks : +2 | -2
Pass Ratio : 17%
What is asynchronous update in hopfield model?
all units are updated simultaneously
a unit is selected at random and its new state is computed
a predefined unit is selected and its new state is computed
none of the mentioned
Explanation:
In asynchronous update, a unit is selected at random and its new state is computed.
Question 5
Marks : +2 | -2
Pass Ratio : 17%
How can states of units be updated in hopfield model?
synchronously
asynchronously
synchronously and asynchronously
none of the mentioned
Explanation:
States of units be updated synchronously and asynchronously in hopfield model.
Question 6
Marks : +2 | -2
Pass Ratio : 17%
For symmetric weights there exist?
basins of attraction corresponding to energy minimum
false wells
fluctuations in energy landscape
none of he mentioned
Explanation:
For symmetric weights there exist a stable point.
Question 7
Marks : +2 | -2
Pass Ratio : 17%
If pattern is to be stored, then what does stable state should have updated value of?
current sate
next state
both current and next state
none of the mentioned
Explanation:
Stable state should have updated value of current sate.
Question 8
Marks : +2 | -2
Pass Ratio : 17%
If connections are not symmetric then basins of attraction may correspond to?
oscillatory regions
stable regions
chaotic regions
oscillatory or chaotic regions
Explanation:
If connections are not symmetric then basins of attraction may correspond to oscillatory or chaotic regions.
Question 9
Marks : +2 | -2
Pass Ratio : 17%
Asynchronous update ensures that the next state is atmost unit hamming distance from current state, is that true?
yes
no
Explanation:
Asynchronous update ensures that the next state is at most unit hamming distance from current state.
Question 10
Marks : +2 | -2
Pass Ratio : 17%
For analysis of storage capacity what are the conditions imposed on hopfield model?
symmetry of weights
asynchronous update
symmetry of weights and asynchronous update
none of the mentioned
Explanation:
For analysis of storage capacity, symmetry of weights and asynchronous update conditions are imposed on hopfield model.