commit 0779fecbf897fe85c5e13da52b129e439c4cc75d
author Sang-Hoon Park <sang-hoon.park@arm.com> Wed Nov 13 17:08:12 2019 +0000
committer Georgios Pinitas <georgios.pinitas@arm.com> Fri Dec 20 11:47:29 2019 +0000
tree c9d9edd74eb423099d9c8d31e1d655a2b6e59173
parent 64e738f32187e8a4ea2624d15b48ed79b34cc824

COMPMID-2763 [CL] add support for QASYMM8_SIGNED to SoftmaxLayer

Change-Id: I4556bde3aa51eb874a4e674dbbd575fa4491c088
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2375
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>

src/core/Utils.cpp

diff --git a/src/core/Utils.cpp b/src/core/Utils.cpp
index fa56118..7e7dea5 100644
--- a/src/core/Utils.cpp
+++ b/src/core/Utils.cpp
@@ -438,6 +438,27 @@
     return !is_first_dim || is_min_max || is_quantized_type;
 }
 
+QuantizationInfo arm_compute::get_softmax_output_quantization_info(DataType input_type, bool is_log)
+{
+    // Note: Output quantization info for softmax should always have
+    // * Softmax with QASYMM8: scale = 1/256, offset = 0
+    // * Softmax with QASYMM8_SIGNED: scale = 1/256, offset = -128
+    // * LogSoftmax with QASYMM8: scale = 1/256, offset = 0
+    // * LogSoftmax with QASYMM8_SIGNED: scale = 16/256, offset = 127
+    if(is_data_type_quantized_asymmetric_signed(input_type))
+    {
+        if(is_log)
+        {
+            return QuantizationInfo(16.f / 256, 127);
+        }
+        else
+        {
+            return QuantizationInfo(1.f / 256, -128);
+        }
+    }
+    return QuantizationInfo(1.f / 256, 0);
+}
+
 #ifdef ARM_COMPUTE_ASSERTS_ENABLED
 void arm_compute::print_consecutive_elements(std::ostream &s, DataType dt, const uint8_t *ptr, unsigned int n, int stream_width, const std::string &element_delim)
 {