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[utils] Adding min, max, argmin, argmax and log_sum_exp to generic vector math header

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Al
2015-04-12 12:08:38 -04:00
parent fdd0c489f3
commit 3a7f18581e
1 changed files with 60 additions and 0 deletions
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60
src/vector_math.h
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@@ -36,6 +36,57 @@
return cpy; \
} \
\
static inline type name##_max(name *vector, size_t n) { \
type max_val = 0; \
type val; \
for (int i = 0; i < n; i++) { \
val = vector->a[i]; \
if (val > max_val) max_val = val; \
} \
return max_val; \
} \
\
static inline type name##_min(name *vector, size_t n) { \
if (n < 1) return (type) 0; \
type val = vector->a[0]; \
type min_val = val; \
for (int i = 1; i < n; i++) { \
val = vector->a[i]; \
if (val < min_val) min_val = val; \
} \
return min_val; \
} \
\
static inline int64_t name##_argmax(name *vector, size_t n) { \
if (n < 1) return -1; \
type max_val = 0; \
int64_t argmax = 0; \
type val; \
for (int i = 0; i < n; i++) { \
val = vector->a[i]; \
if (val > max_val) { \
max_val = val; \
argmax = i; \
} \
} \
return argmax; \
} \
\
static inline int64_t name##_argmin(name *vector, size_t n) { \
if (n < 1) return (type) -1; \
type val = vector->a[0]; \
type min_val = val; \
int64_t argmin = 0; \
for (int i = 1; i < n; i++) { \
val = vector->a[i]; \
if (val < min_val) { \
min_val = val; \
argmin = i; \
} \
} \
return argmin; \
} \
\
static inline void name##_add(name *vector, type c, size_t n) { \
for (int i = 0; i < n; i++) { \
vector->a[i] += c; \
@@ -96,6 +147,15 @@
return result; \
} \
\
static inline type name##_log_sum_exp(name *vector, size_t n) { \
type max = name##_max(vector, n); \
type result = 0; \
for (int i = 0; i < n; i++) { \
result += exp(vector->a[i] - max); \
} \
return max + log(result); \
} \
\
static inline void name##_add_vector(name *v1, name *v2, size_t n) { \
for (int i = 0; i < n; i++) { \
v1->a[i] += v2->a[i]; \