\[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
Test:
NMSE Section 6.1 mentioned, A
Bits:
128 bits
Bits error versus x
Bits error versus eps
Time: 42.1 s
Input Error: 12.6
Output Error: 1.8
Log:
Profile: 🕒
\(\frac{\left(e^{-(\varepsilon * x + x)_*} + e^{\left(1 - \varepsilon\right) \cdot \left(-x\right)}\right) + \left(\frac{\frac{1}{\varepsilon}}{{\left(e^{x}\right)}^{\left(1 - \varepsilon\right)}} - \frac{\frac{1}{\varepsilon}}{e^{(\varepsilon * x + x)_*}}\right)}{2}\)
  1. Started with
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
    12.6
  2. Using strategy rm
    12.6
  3. Applied exp-neg to get
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot \color{red}{e^{-\left(1 - \varepsilon\right) \cdot x}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2} \leadsto \frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot \color{blue}{\frac{1}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
    12.6
  4. Applied un-div-inv to get
    \[\frac{\color{red}{\left(1 + \frac{1}{\varepsilon}\right) \cdot \frac{1}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2} \leadsto \frac{\color{blue}{\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
    12.6
  5. Using strategy rm
    12.6
  6. Applied expm1-log1p-u to get
    \[\frac{\color{red}{\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}}{2} \leadsto \frac{\color{blue}{(e^{\log_* (1 + \left(\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}\right))} - 1)^*}}{2}\]
    12.7
  7. Applied simplify to get
    \[\frac{(e^{\color{red}{\log_* (1 + \left(\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}\right))}} - 1)^*}{2} \leadsto \frac{(e^{\color{blue}{\log_* (1 + \left(\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \frac{\frac{1}{\varepsilon} - 1}{e^{(\varepsilon * x + x)_*}}\right))}} - 1)^*}{2}\]
    12.7
  8. Applied taylor to get
    \[\frac{(e^{\log_* (1 + \left(\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \frac{\frac{1}{\varepsilon} - 1}{e^{(\varepsilon * x + x)_*}}\right))} - 1)^*}{2} \leadsto \frac{(e^{\log_* (1 + \left(\left(\frac{1}{e^{x \cdot \left(1 - \varepsilon\right)}} + \left(\frac{1}{e^{(\varepsilon * x + x)_*}} + \frac{1}{\varepsilon \cdot e^{x \cdot \left(1 - \varepsilon\right)}}\right)\right) - \frac{1}{\varepsilon \cdot e^{(\varepsilon * x + x)_*}}\right))} - 1)^*}{2}\]
    9.5
  9. Taylor expanded around 0 to get
    \[\frac{(e^{\color{red}{\log_* (1 + \left(\left(\frac{1}{e^{x \cdot \left(1 - \varepsilon\right)}} + \left(\frac{1}{e^{(\varepsilon * x + x)_*}} + \frac{1}{\varepsilon \cdot e^{x \cdot \left(1 - \varepsilon\right)}}\right)\right) - \frac{1}{\varepsilon \cdot e^{(\varepsilon * x + x)_*}}\right))}} - 1)^*}{2} \leadsto \frac{(e^{\color{blue}{\log_* (1 + \left(\left(\frac{1}{e^{x \cdot \left(1 - \varepsilon\right)}} + \left(\frac{1}{e^{(\varepsilon * x + x)_*}} + \frac{1}{\varepsilon \cdot e^{x \cdot \left(1 - \varepsilon\right)}}\right)\right) - \frac{1}{\varepsilon \cdot e^{(\varepsilon * x + x)_*}}\right))}} - 1)^*}{2}\]
    9.5
  10. Applied simplify to get
    \[\frac{(e^{\log_* (1 + \left(\left(\frac{1}{e^{x \cdot \left(1 - \varepsilon\right)}} + \left(\frac{1}{e^{(\varepsilon * x + x)_*}} + \frac{1}{\varepsilon \cdot e^{x \cdot \left(1 - \varepsilon\right)}}\right)\right) - \frac{1}{\varepsilon \cdot e^{(\varepsilon * x + x)_*}}\right))} - 1)^*}{2} \leadsto \frac{\left(e^{-(\varepsilon * x + x)_*} + e^{\left(1 - \varepsilon\right) \cdot \left(-x\right)}\right) + \left(\frac{\frac{1}{\varepsilon}}{{\left(e^{x}\right)}^{\left(1 - \varepsilon\right)}} - \frac{\frac{1}{\varepsilon}}{e^{(\varepsilon * x + x)_*}}\right)}{2}\]
    1.8

  11. Applied final simplification

Original test:


(lambda ((x default) (eps default))
  #:name "NMSE Section 6.1 mentioned, A"
  (/ (- (* (+ 1 (/ 1 eps)) (exp (- (* (- 1 eps) x)))) (* (- (/ 1 eps) 1) (exp (- (* (+ 1 eps) x))))) 2))