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inv_logit.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_INV_LOGIT_HPP
2 #define STAN_MATH_REV_SCAL_FUN_INV_LOGIT_HPP
3 
4 #include <stan/math/rev/core.hpp>
6 
7 namespace stan {
8  namespace math {
9 
10  namespace {
11  class inv_logit_vari : public op_v_vari {
12  public:
13  explicit inv_logit_vari(vari* avi) :
14  op_v_vari(stan::math::inv_logit(avi->val_), avi) {
15  }
16  void chain() {
17  avi_->adj_ += adj_ * val_ * (1.0 - val_);
18  }
19  };
20  }
21 
34  inline var inv_logit(const stan::math::var& a) {
35  return var(new inv_logit_vari(a.vi_));
36  }
37 
38  }
39 }
40 #endif
fvar< T > inv_logit(const fvar< T > &x)
Definition: inv_logit.hpp:15
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44

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