lecture1-intro-handout-6-per

Toanswerquerytakethevectorsforbrutuscaesar

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Unformatted text preview: lpurnia
is
non‐trivial
   Other
opera)ons
(e.g.,
find
the
word
Romans near
 countrymen)
not
feasible
   Ranked
retrieval
(best
documents
to
return)
 Brutus AND Caesar BUT NOT Calpurnia   Later
lectures
 1 if play contains word, 0 otherwise 5
 1 Introduc)on to Informa)on Retrieval Sec. 1.1 Sec. 1.1 Introduc)on to Informa)on Retrieval Incidence
vectors
 Answers
to
query
   So
we
have
a
0/1
vector
for
each
term.
   To
answer
query:
take
the
vectors
for
Brutus, Caesar
 and
Calpurnia
(complemented)


bitwise
AND.
   110100
AND
110111
AND
101111
=
100100.

   Antony and Cleopatra,
Act III, Scene ii Agrippa [Aside to DOMITIUS ENOBARBUS]: Why, Enobarbus, When Antony found Julius Caesar dead, He cried almost to roaring; and he wept When at Philippi he found Brutus slain.   Hamlet, Act III, Scene ii Lord Polonius: I did enact Julius Caesar I was killed i' the Capitol; Brutus killed me. 7
 Introduc)on to Informa)on Retrieval Sec. 1.1 8
 Introduc)on to Informa)on Retrieval Basic
assump)ons
of
Informa)on
Retrieval
 The
classic
search
model
   Collec)on:
Fixed
set
of
documents
   Goal:
Retrieve
documents
with
informa)on
...
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