aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/torch/torch7/lib/TH/THMath.h
blob: 004e4fe45db547b120f219c1ba2642cd838f90bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
#ifndef _THMATH_H
#define _THMATH_H

static inline double TH_sigmoid(double value) {
  return 1.0 / (1.0 + exp(-value));
}

static inline double TH_frac(double x) {
  return x - trunc(x);
}

static inline double TH_rsqrt(double x) {
  return 1.0 / sqrt(x);
}

static inline double TH_lerp(double a, double b, double weight) {
  return a + weight * (b-a);
}

static inline float TH_sigmoidf(float value) {
  return 1.0f / (1.0f + expf(-value));
}

static inline float TH_fracf(float x) {
  return x - truncf(x);
}

static inline float TH_rsqrtf(float x) {
  return 1.0f / sqrtf(x);
}

static inline float TH_lerpf(float a, float b, float weight) {
  return a + weight * (b-a);
}

#endif // _THMATH_H