Chapter 20 Part 1 Study Guide Solution
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Q: Define the bag of words features.  To make things simpler, let's use a small window side: plus and minus 2 around the target word.  In our simple example, we are choosing just 4 features.

Note that words like "can" and "a" are excluded because they are stop words.

**TRAINING DATA**

S1: How can a <tag "532735">band</> of vociferous and woolly-minded objectors deny the hope of life to thousands of young sufferers by stopping this vital research for the sake of a few unformed embryonic cells?   

BOW["vociferous"] = 1
BOW["woolly-minded"] = 1
BOW["objectors"] = 1

S2: The voices of Sarah Gilbertson and Tony Mansell were joined by three more from the <tag "532736">band</> as the Moonlight Serenaders to give us the cool harmonies of Miller's original Modernairs.  

BOW["Moonlight"] = 1
BOW["Serenaders"] = 1

S3: In the process they've lost a certain edge, for at the end The Cateran had the rage and the fury of a <tag "532736">band</> at its peak falling apart.   
BOW["fury"] = 1
BOW["peak"] = 1
BOW["falling"] = 1
BOW["apart"] = 1

S4: The <tag "532736">band</> played with fury at peak.

BOW["fury"] = 2
BOW["peak"] = 2
BOW["played"] = 1

S5: The vociferous <tag "532735">band</> of objectors made its way to the palace.

BOW["vociferous"] = 2
BOW["objectors"] = 2

Choose the top 4 most frequent.   So, we have one feature for each of "fury", "peak", "vociferous", and "objectors".

S1: 0,0,1,1
S2: 0,0,0,0
S3: 1,1,0,0
S4: 1,1,0,0
S5: 0,0,1,1

*** TEST DATA ***

S6: The <tag "532736">band</>, at their peak, just finished a tour supporting Soul II Soul are currently playing PAs around the county.   

S6: 0,1,0,0

S7: The malts vary so much that a growing <tag "532735">band</> of objectors are making themselves heard.

S7: 0,0,0,1