Fixing float generator in regression tests #256
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Previously, this generate function will recast the result of
static_cast<float>(rand()) / RAND_MAX;back to anintbecause the function is defined as returning anint, thus the result will aloways be rounded down to 0 and all genrated data is all 0's. Thus, correctness is not really checked in this test, because the input is all 0's so it's easy to make the outputs all equal 0 as well.