Maurice Tutor
$15/per page/Negotiable
(Printer nightmare continued) Continuing with the BN given in Fig. 9.21, the following table represents data gathered on the printer, where ? indicates that the entry is missing. Each column represents a datapoint. Use the EM algorithm to learn all CPTs of the network.
|
fuse assembly malfunction |
? |
? |
? |
1 |
0 |
0 |
? |
0 |
? |
0 |
0 |
? |
1 |
? |
1 |
|
drum unit |
? |
0 |
? |
0 |
1 |
0 |
0 |
1 |
? |
? |
1 |
1 |
? |
0 |
0 |
|
toner out |
1 |
1 |
0 |
? |
? |
1 |
0 |
1 |
0 |
? |
0 |
1 |
? |
0 |
? |
|
poor paper quality |
1 |
0 |
1 |
0 |
1 |
? |
1 |
0 |
1 |
1 |
? |
1 |
1 |
? |
0 |
|
worn roller |
0 |
0 |
? |
? |
? |
0 |
1 |
? |
0 |
0 |
? |
0 |
? |
1 |
1 |
|
burning smell |
0 |
? |
? |
1 |
0 |
0 |
0 |
0 |
0 |
? |
0 |
? |
1 |
0 |
? |
|
poor print quality |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
? |
? |
0 |
|
wrinkled pages |
0 |
0 |
1 |
0 |
0 |
0 |
? |
0 |
1 |
? |
0 |
0 |
1 |
1 |
1 |
|
multiple pages fed |
0 |
? |
1 |
0 |
? |
0 |
1 |
0 |
1 |
? |
0 |
0 |
? |
0 |
1 |
|
paper jam |
? |
0 |
1 |
1 |
? |
0 |
1 |
1 |
1 |
1 |
0 |
? |
0 |
1 |
? |
The table is contained in EMprinter.mat, using states 1 , 2 , nan in place of 0 , 1 , ? (since BRMLtoolbox requires states to be numbered 1, 2, . . . . ). Given no wrinkled pages, no burning smell and poor print quality, what is the probability there is a drum unit problem?