[VIAME] Fix undefined or incorrect behavior in darknet_trainer #1626
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Per rule 20 of the "Sequenced-before rules" at https://en.cppreference.com/w/cpp/language/eval_order, starting in C++17 the right-hand side of an assignment is evaluated before the left-hand side, which is not the desired behavior.
Prior to C++17, the behavior is, as I understand it, undefined.