• 0:01 - 0:10
Now, the first answer is two-third, and the reason is we observed A once, and this was all we observed.
• 0:10 - 0:14
So maximum life would give us a probability of one, but because we used Laplacian smoothing,
• 0:14 - 0:19
and there's two different possible states, we add one, as before, which makes two-thirds.
• 0:19 - 0:29
Two-thirds is also the correct answer for the next question. There's one, two, three, four transitions out of A,
• 0:29 - 0:37
three of which leads to A again. So maximum life would give us three-quarters, but because we do Laplacian smoothing,
• 0:37 - 0:43
we add one fake transition over here, and there could've been two of those, one to A and one to B, we had two over here,
• 0:43 - 0:50
which is four over six or two over three. And there's no transition out of B in this example.
• 0:50 - 0:57
So for maximum life we wouldn't even know what to say. But in our case, with Laplacian smoothing, we add one fake observation
• 0:57 - 1:02
divided by two as a denominator, so we get half for the last question.
Title:
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Video Language:
English
Team:
Udacity
Project:
CS271 - Intro to Artificial Intelligence
Duration:
01:02
 Udacity Robot edited English subtitles for Midterm 1 Answer 15mp4 sp1 added a translation

# English subtitles

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