|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
Naïve idea of switching
based on row number and feature
|
|
number does not
work well
|
|
|
• |
to estimate the
required computation of an enumeration
|
|
|
sub-tree,
i.e., row enumeration sub-tree or
feature
|
|
|
enumeration
sub-tree.
|
|
|
|
– |
Estimate the
maximal level of enumeration for each children sub-
|
|
|
tree
|
|
|
• |
Example of
estimating the maximal level of enumeration:
|
|
|
|
– |
Suppose r=10,
S(f1)=0.8, S(f2)=0.5, S(f3)=0.5, S(f4)=0.3 and
|
|
|
minsup=2
|
|
|
|
– |
S(f1)*S(f2)*S(f3)*r
=2 ≥ minsup
|
|
|
|
– |
S(f1)*S(f2)*S(f3)*S(f4)*r
=0.6 < minsup
|
|
|
|
– |
Then the
estimated deepest node under f1 is f1f2f3
|
|