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Takes a logical graph and picks a subset of vertices or edges
from this graph using the selected sampling type.
The relative amount of the vertices or edges in the result graph can be
set by the sampling threshold in a range from 0.0 to 1.0.
Note: The threshold is the probability whether a single element will be
kept. For each element, a random value between 0.0 and 1.0 is calculated
and compared with the threshold value. The element will be kept if the
random value is smaller than the threshold. Therefore, samplings are not
deterministic and will always lead to another result.
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