Average Error: 0.5 → 0.7
Time: 26.9s
Precision: 64
Internal Precision: 128
\[\log \left(1 + e^{x}\right) - x \cdot y\]
\[\log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(x \cdot y + \sqrt[3]{\log \left(1 + \left(e^{x} \cdot e^{x} - e^{x}\right)\right) \cdot \left(\left(\log \left(\sqrt{e^{x + x} - \left(-1 + e^{x}\right)}\right) + \left(\log \left(\sqrt{1 - \left(e^{x} \cdot \left(-1 + e^{x}\right)\right) \cdot \left(e^{x} \cdot \left(-1 + e^{x}\right)\right)}\right) - \log \left(\sqrt{1 - \left(e^{x} \cdot e^{x} - e^{x}\right)}\right)\right)\right) \cdot \log \left(1 + \left(e^{x} \cdot e^{x} - e^{x}\right)\right)\right)}\right)\]

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original0.5
Target0.0
Herbie0.7
\[\begin{array}{l} \mathbf{if}\;x \le 0:\\ \;\;\;\;\log \left(1 + e^{x}\right) - x \cdot y\\ \mathbf{else}:\\ \;\;\;\;\log \left(1 + e^{-x}\right) - \left(-x\right) \cdot \left(1 - y\right)\\ \end{array}\]

Derivation

  1. Initial program 0.5

    \[\log \left(1 + e^{x}\right) - x \cdot y\]
  2. Initial simplification0.5

    \[\leadsto \log \left(1 + e^{x}\right) - y \cdot x\]
  3. Using strategy rm
  4. Applied flip3-+0.5

    \[\leadsto \log \color{blue}{\left(\frac{{1}^{3} + {\left(e^{x}\right)}^{3}}{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)} - y \cdot x\]
  5. Applied log-div0.5

    \[\leadsto \color{blue}{\left(\log \left({1}^{3} + {\left(e^{x}\right)}^{3}\right) - \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)\right)} - y \cdot x\]
  6. Applied associate--l-0.5

    \[\leadsto \color{blue}{\log \left({1}^{3} + {\left(e^{x}\right)}^{3}\right) - \left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) + y \cdot x\right)}\]
  7. Simplified0.5

    \[\leadsto \color{blue}{\log \left({\left(e^{x}\right)}^{3} + 1\right)} - \left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) + y \cdot x\right)\]
  8. Using strategy rm
  9. Applied add-cbrt-cube0.5

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\color{blue}{\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)}} + y \cdot x\right)\]
  10. Using strategy rm
  11. Applied add-sqr-sqrt0.5

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \log \color{blue}{\left(\sqrt{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)} \cdot \sqrt{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)}\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  12. Applied log-prod0.5

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \color{blue}{\left(\log \left(\sqrt{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right) + \log \left(\sqrt{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)\right)}\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  13. Simplified0.5

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \left(\color{blue}{\log \left(\sqrt{e^{x + x} - \left(e^{x} + -1\right)}\right)} + \log \left(\sqrt{1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  14. Using strategy rm
  15. Applied flip-+0.5

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \left(\log \left(\sqrt{e^{x + x} - \left(e^{x} + -1\right)}\right) + \log \left(\sqrt{\color{blue}{\frac{\left(1 \cdot 1\right) \cdot \left(1 \cdot 1\right) - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right) \cdot \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}{1 \cdot 1 - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}}}\right)\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  16. Applied sqrt-div0.7

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \left(\log \left(\sqrt{e^{x + x} - \left(e^{x} + -1\right)}\right) + \log \color{blue}{\left(\frac{\sqrt{\left(1 \cdot 1\right) \cdot \left(1 \cdot 1\right) - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right) \cdot \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}}{\sqrt{1 \cdot 1 - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}}\right)}\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  17. Applied log-div0.7

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \left(\log \left(\sqrt{e^{x + x} - \left(e^{x} + -1\right)}\right) + \color{blue}{\left(\log \left(\sqrt{\left(1 \cdot 1\right) \cdot \left(1 \cdot 1\right) - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right) \cdot \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right) - \log \left(\sqrt{1 \cdot 1 - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)\right)}\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  18. Simplified0.7

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(\sqrt[3]{\left(\log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right) \cdot \left(\log \left(\sqrt{e^{x + x} - \left(e^{x} + -1\right)}\right) + \left(\color{blue}{\log \left(\sqrt{1 - \left(e^{x} \cdot \left(-1 + e^{x}\right)\right) \cdot \left(e^{x} \cdot \left(-1 + e^{x}\right)\right)}\right)} - \log \left(\sqrt{1 \cdot 1 - \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)}\right)\right)\right)\right) \cdot \log \left(1 \cdot 1 + \left(e^{x} \cdot e^{x} - 1 \cdot e^{x}\right)\right)} + y \cdot x\right)\]
  19. Final simplification0.7

    \[\leadsto \log \left({\left(e^{x}\right)}^{3} + 1\right) - \left(x \cdot y + \sqrt[3]{\log \left(1 + \left(e^{x} \cdot e^{x} - e^{x}\right)\right) \cdot \left(\left(\log \left(\sqrt{e^{x + x} - \left(-1 + e^{x}\right)}\right) + \left(\log \left(\sqrt{1 - \left(e^{x} \cdot \left(-1 + e^{x}\right)\right) \cdot \left(e^{x} \cdot \left(-1 + e^{x}\right)\right)}\right) - \log \left(\sqrt{1 - \left(e^{x} \cdot e^{x} - e^{x}\right)}\right)\right)\right) \cdot \log \left(1 + \left(e^{x} \cdot e^{x} - e^{x}\right)\right)\right)}\right)\]

Runtime

Time bar (total: 26.9s)Debug logProfile

BaselineHerbieOracleSpan%
Regimes0.70.70.20.50%
herbie shell --seed 2018354 
(FPCore (x y)
  :name "Logistic regression 2"

  :herbie-target
  (if (<= x 0) (- (log (+ 1 (exp x))) (* x y)) (- (log (+ 1 (exp (- x)))) (* (- x) (- 1 y))))

  (- (log (+ 1 (exp x))) (* x y)))