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BPR gradient question #805

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zsyu9779 opened this issue Feb 27, 2024 · 0 comments
Open

BPR gradient question #805

zsyu9779 opened this issue Feb 27, 2024 · 0 comments

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@zsyu9779
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zsyu9779 commented Feb 27, 2024 •
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I noticed that the code for calculating gradient in the BPR model computation in the gorse source code is:

grad := math32.Exp(-diff) / (1.0 + math32.Exp(-diff))

While in some conventional literature, the formula for calculating gradient seems to be:

$$\frac{1}{1 + e^{-(diff)}}$$

Could you please explain if the author has any special considerations for doing this? What is the reason for this difference?
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