diff options
Diffstat (limited to 'src/core/helpers/LUTManager.cpp')
| -rw-r--r-- | src/core/helpers/LUTManager.cpp | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/src/core/helpers/LUTManager.cpp b/src/core/helpers/LUTManager.cpp index 06e35eed8c..2effffbe92 100644 --- a/src/core/helpers/LUTManager.cpp +++ b/src/core/helpers/LUTManager.cpp @@ -30,17 +30,38 @@ namespace arm_compute namespace { -void init_lut_fp16(ActivationLayerInfo::LookupTable65536 *lut) +float16_t activation(float16_t x, const LUTInfo &info) +{ + float16_t out = 0.f; + switch (info.act) + { + case ActivationLayerInfo::ActivationFunction::LOGISTIC: + out = 1.f / (1.f + std::exp(-x)); + break; + case ActivationLayerInfo::ActivationFunction::TANH: + { + out = static_cast<float16_t>(info.alpha * std::tanh(info.beta * x)); + break; + } + default: + ARM_COMPUTE_ERROR("Unsupported Activation for 16-bit LUT table"); + break; + } + return out; +} + +void init_lut_fp16(ActivationLayerInfo::LookupTable65536 *lut, const LUTInfo &info) { union Element { uint16_t i = 0; float16_t fp; } item; + // Fill lut by iterating over all 16 bit values using the union. while (true) { - (*lut)[item.i] = 1.f / (1.f + std::exp(-item.fp)); + (*lut)[item.i] = activation(item.fp, info); if (item.i == 65535) break; item.i++; @@ -62,7 +83,7 @@ std::shared_ptr<ActivationLayerInfo::LookupTable65536> LUTManager::get_lut_table // Not found, or pointer not valid // We do not use make_shared to prevent the weak_ptr keeping the control block alive std::shared_ptr<ActivationLayerInfo::LookupTable65536> ptr(new ActivationLayerInfo::LookupTable65536); - init_lut_fp16(ptr.get()); + init_lut_fp16(ptr.get(), info); map_fp16[info] = ptr; return ptr; } |