Details
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Bug
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Status: Closed
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Minor
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Resolution: Fixed
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None
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None
Description
As far as I understand, the for and parfor-loops should execute the same iterations given the same sequence. However, when counting backwards, the parfor-loop is not executed if to == from - 1. So for example:
for(i in 1:0) {
print(i);
}
prints 1 and 0. However,
parfor(i in 1:0) {
print(i);
}
does not print anything. The analogous holds, e.g., for "i in 123:122" etc.
The problem seems to be in org.apache.sysds.runtime.controlprogram.ParForProgramBlock.computeNumIterations(), which does not work correctly when counting backwards.