Prior to
the session:
At the lab:
Exercise 1: Randomize the weights and biases. Cycle the network on each
of the input patterns in the training set and inspect the activations on the
output units. For each individual, record whether that individual is classified
as a Jet or a Shark by comparing the relative activation levels of the Jets and
Sharks units.
|
Name |
Initial Classification |
|
Robin |
|
|
Margaret |
|
|
Bill |
|
|
Janet |
|
|
Mike |
|
|
Alfred |
|
|
Joan |
|
|
Gerry |
|
|
Catherine |
|
|
Brett |
|
|
John |
|
|
Sandra |
|
|
Joshua |
|
|
Beth |
|
|
Bert |
|
|
Maria |
|
Exercise 2: Does the untrained network have a classification bias?
__________________________________________________________________________________________________________________________________________
Exercise 3:
Note: Train
for 5 (rather than 40 epochs) and report the results after 5 epochs
Use the graph tool to graph the output set error. Change the maximum
value that can be displayed in the graph from 1 to 10. Now, randomize the weights
and biases of the Jets and Sharks network and then train it for 5 epochs. What
is the error on the output set after 5 epochs?
_____________________________________________________________________
Exercise 4:
Note: Q 4 has been replaced with the
following:
After the network has been trained for 5 epochs, re-test it on the
patterns in the training set. Report which is the most
difficult pattern to learn, and explain why
In the following Table, write down the Classification
|
Name |
Correct Classification |
Actual Classification |
Output Value of winning unit |
|
Robin |
Jet |
|
|
|
Margaret |
Shark |
|
|
|
Bill |
Jet |
|
|
|
Janet |
Shark |
|
|
|
Mike |
Jet |
|
|
|
Alfred |
Shark |
|
|
|
Joan |
Jet |
|
|
|
Gerry |
Shark |
|
|
|
Catherine |
Jet |
|
|
|
Brett |
Shark |
|
|
|
John |
Jet |
|
|
|
Sandra |
Shark |
|
|
|
Joshua |
Jet |
|
|
|
Beth |
Shark |
|
|
|
Bert |
Jet |
|
|
|
Maria |
Shark |
|
|
_______________________________________________________________________________________________________________________________________________________________________________________________________________
To help you answer the next question, to start off with… tick the
appropriate characteristics of each individual.
|
Name |
Gang |
Age |
Education |
Marital Status |
Occupation |
||||||||
|
|
|
20s |
30s |
40s |
JH |
HS |
C |
S |
M |
D |
Psh |
Bk |
Brg |
|
Robin |
Jets |
|
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Bill |
Jets |
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Mike |
Jets |
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Joan |
Jets |
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Catherine |
Jets |
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John |
Jets |
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Joshua |
Jets |
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Bert |
Jets |
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Margaret |
Sharks |
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Janet |
Sharks |
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Alfred |
Sharks |
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Gerry |
Sharks |
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Brett |
Sharks |
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Sandra |
Sharks |
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Beth |
Sharks |
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