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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