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#pragma once
#include <string.h>
#include <cmath>
#include <cstdint>
#include "c10/util/irange.h"
#include "caffe2/utils/conversions.h"
#if (ENABLE_VECTORIZATION > 0) && !defined(_DEBUG) && !defined(DEBUG)
#if defined(__clang__) && (__clang_major__ > 7)
#define IS_SANITIZER \
((__has_feature(address_sanitizer) == 1) || \
(__has_feature(memory_sanitizer) == 1) || \
(__has_feature(thread_sanitizer) == 1) || \
(__has_feature(undefined_sanitizer) == 1))
#if IS_SANITIZER == 0
#define VECTOR_LOOP _Pragma("clang loop vectorize(enable)")
#endif
#elif defined(_OPENMP) && (_OPENMP >= 201511)
// Support with OpenMP4.5 and above
#define VECTOR_LOOP _Pragma("omp for simd")
#endif
#endif
#ifndef VECTOR_LOOP
// Not supported
#define VECTOR_LOOP
#endif
namespace caffe2 {
namespace perfkernels {
namespace {
template <typename T>
inline T sigmoid(T x) {
return 1 / (1 + std::exp(-x));
}
template <typename T>
inline T host_tanh(T x) {
return 2 * sigmoid(2 * x) - 1;
}
template <typename T>
inline void LstmUnitImpl(
const int N,
const int D,
const int t,
const T* H_prev,
const T* C_prev,
const T* X,
const int32_t* seqLengths,
const bool drop_states,
T* C,
T* H,
const float forget_bias) {
const T forgetBias = convert::To<float, T>(forget_bias);
for (const auto n : c10::irange(N)) {
const bool valid = seqLengths == nullptr || t < seqLengths[n];
if (!valid) {
if (drop_states) {
memset(H, 0, sizeof(T) * D);
memset(C, 0, sizeof(T) * D);
} else {
memcpy(H, H_prev, sizeof(T) * D);
memcpy(C, C_prev, sizeof(T) * D);
}
} else {
const T* X_D = &X[D];
const T* X_2D = &X[2 * D];
const T* X_3D = &X[3 * D];
VECTOR_LOOP for (const auto d : c10::irange(D)) {
const T i = sigmoid(X[d]);
const T f = sigmoid(X_D[d] + forgetBias);
const T o = sigmoid(X_2D[d]);
const T g = host_tanh(X_3D[d]);
const T c_prev = C_prev[d];
const T c = f * c_prev + i * g;
C[d] = c;
const T host_tanh_c = host_tanh(c);
H[d] = o * host_tanh_c;
}
}
H_prev += D;
C_prev += D;
X += 4 * D;
C += D;
H += D;
}
}
template <typename T>
inline void LstmUnitGradientImpl(
int N,
int D,
int t,
const T* C_prev,
const T* X,
const int32_t* seqLengths,
const T* C,
const T* H,
const T* C_diff,
const T* H_diff,
bool drop_states,
T* H_prev_diff,
T* C_prev_diff,
T* X_diff,
const float forget_bias) {
const T localForgetBias = convert::To<float, T>(forget_bias);
for (const auto n : c10::irange(N)) {
const bool valid = seqLengths == nullptr || t < seqLengths[n];
if (!valid) {
if (drop_states) {
memset(C_prev_diff, 0, sizeof(T) * D);
memset(H_prev_diff, 0, sizeof(T) * D);
} else {
memcpy(H_prev_diff, H_diff, sizeof(T) * D);
memcpy(C_prev_diff, C_diff, sizeof(T) * D);
}
memset(X_diff, 0, 4 * sizeof(T) * D);
} else {
VECTOR_LOOP for (const auto d : c10::irange(D)) {
T* c_prev_diff = C_prev_diff + d;
T* h_prev_diff = H_prev_diff + d;
T* i_diff = X_diff + d;
T* f_diff = X_diff + 1 * D + d;
T* o_diff = X_diff + 2 * D + d;
T* g_diff = X_diff + 3 * D + d;
const T i = sigmoid(X[d]);
const T f = sigmoid(X[1 * D + d] + localForgetBias);
const T o = sigmoid(X[2 * D + d]);
const T g = host_tanh(X[3 * D + d]);
const T c_prev = C_prev[d];
const T c = C[d];
const T host_tanh_c = host_tanh(c);
const T c_term_diff =
C_diff[d] + H_diff[d] * o * (1 - host_tanh_c * host_tanh_c);
*c_prev_diff = c_term_diff * f;
*h_prev_diff = 0; // not used in 'valid' case
*i_diff = c_term_diff * g * i * (1 - i);
*f_diff = c_term_diff * c_prev * f * (1 - f);
*o_diff = H_diff[d] * host_tanh_c * o * (1 - o);
*g_diff = c_term_diff * i * (1 - g * g);
}
}
C_prev += D;
X += 4 * D;
C += D;
H += D;
C_diff += D;
H_diff += D;
X_diff += 4 * D;
H_prev_diff += D;
C_prev_diff += D;
}
}
} // namespace
} // namespace perfkernels
} // namespace caffe2
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