change Poisson log-likelihood truncation/thresholding strategy#1482
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KrisThielemans wants to merge 3 commits intoUCL:masterfrom
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change Poisson log-likelihood truncation/thresholding strategy#1482KrisThielemans wants to merge 3 commits intoUCL:masterfrom
KrisThielemans wants to merge 3 commits intoUCL:masterfrom
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accumulate_sub_Hessian_times_input_without_penalty used divide_and_truncate, but this is incorrect as its threshold strategies are not appropriate for (measured * forward_input)/forward_current^2. Most obvious example is if forward_input contains negatives. We now use 0/x=0 (first thresholding measured data to be non-negative). UCL#1461
KrisThielemans
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WIP to fix #1472. Currently only handling Hessian.