Add conversions of U8 to/from BF16 and FP8
Adds type to PadAttribute and ClampAttribute so their pad_const
and max_val/min_val can be deserialized according to type
Adds conversion functions of U8 arrays to/from BF16/FP8 values
Also, refactor and expose TosaSerializer.convertDataToUint8Vec
for converting dtype/data to uint8 list for serialization
And modify convertDataToUint8Vec to serialize bf16 values into
2 bytes each, and serialize fp8 values into single bytes each.
Signed-off-by: Tai Ly <tai.ly@arm.com>
Change-Id: I05659e8187c76d359f1cc9f71c8c23cafd0e877f
diff --git a/src/tosa_serialization_handler.cpp b/src/tosa_serialization_handler.cpp
index 749a3c8..85625cd 100644
--- a/src/tosa_serialization_handler.cpp
+++ b/src/tosa_serialization_handler.cpp
@@ -19,6 +19,9 @@
#include <iostream>
using namespace tosa;
+using fp8e4m3 = tosa::float_t<int8_t, 4, true, true, false>;
+using fp8e5m2 = tosa::float_t<int8_t, 5, true, true, true>;
+
TosaSerializationTensor::TosaSerializationTensor(const flatbuffers::String* name,
const flatbuffers::Vector<int32_t>* shape,
DType dtype,
@@ -747,6 +750,51 @@
}
}
+tosa_err_t TosaSerializationHandler::ConvertBF16toU8(const std::vector<float>& in, std::vector<uint8_t>& out)
+{
+ // Note: Converts fp32->bf16 by ignoring the least significant 16 bits
+ out.clear();
+ for (auto val : in)
+ {
+ uint32_t* val_u32 = reinterpret_cast<uint32_t*>(&val);
+ uint8_t f32_byte2 = (*val_u32 >> 16) & 0xFF;
+ uint8_t f32_byte3 = (*val_u32 >> 24) & 0xFF;
+ // little endian: byte2 followed by byte3
+ out.push_back(f32_byte2);
+ out.push_back(f32_byte3);
+ }
+ ForceAlignTensorData(out);
+ return TOSA_OK;
+}
+
+tosa_err_t TosaSerializationHandler::ConvertFP8E4M3toU8(const std::vector<float>& in, std::vector<uint8_t>& out)
+{
+ // Note: Converts fp32->FP8E4M3 before converting to unint8_t
+ out.clear();
+ for (auto val : in)
+ {
+ auto f8 = static_cast<fp8e4m3>(val);
+ uint8_t b8 = f8.bits();
+ out.push_back(b8);
+ }
+ ForceAlignTensorData(out);
+ return TOSA_OK;
+}
+
+tosa_err_t TosaSerializationHandler::ConvertFP8E5M2toU8(const std::vector<float>& in, std::vector<uint8_t>& out)
+{
+ // Note: Converts fp32->FP8E5M2 before converting to uint8_t
+ out.clear();
+ for (auto val : in)
+ {
+ auto f8 = static_cast<fp8e5m2>(val);
+ uint8_t b8 = f8.bits();
+ out.push_back(b8);
+ }
+ ForceAlignTensorData(out);
+ return TOSA_OK;
+}
+
tosa_err_t TosaSerializationHandler::ConvertF16toU8(const std::vector<float>& in, std::vector<uint8_t>& out)
{
// Note: Converts fp32->fp16 before converting to uint8_t
@@ -896,6 +944,78 @@
return TOSA_OK;
}
+tosa_err_t TosaSerializationHandler::ConvertU8toBF16(const std::vector<uint8_t>& in,
+ uint32_t out_size,
+ std::vector<float>& out)
+{
+ // Note: bf16 values returned in fp32 type
+ out.clear();
+ if (in.size() < out_size * sizeof(int16_t))
+ {
+ printf("TosaSerializationHandler::ConvertU8toBF16(): uint8 buffer size %ld must >= target size %ld\n",
+ in.size(), out_size * sizeof(int16_t));
+ return TOSA_USER_ERROR;
+ }
+
+ for (uint32_t i = 0; i < out_size; i++)
+ {
+ uint32_t f32_byte2 = in[i * sizeof(int16_t)];
+ uint32_t f32_byte3 = in[i * sizeof(int16_t) + 1];
+ uint32_t val_u32 = (f32_byte2 << 16) + (f32_byte3 << 24);
+
+ // Reinterpret u32 bytes as fp32
+ float val_f32 = *(float*)&val_u32;
+ out.push_back(val_f32);
+ }
+ return TOSA_OK;
+}
+
+tosa_err_t TosaSerializationHandler::ConvertU8toFP8E4M3(const std::vector<uint8_t>& in,
+ uint32_t out_size,
+ std::vector<float>& out)
+{
+ // Note: FP8E4M3 values returned in fp32 type
+ out.clear();
+ if (in.size() < out_size * sizeof(int8_t))
+ {
+ printf("TosaSerializationHandler::ConvertU8toF16(): uint8 buffer size %ld must >= target size %ld\n", in.size(),
+ out_size * sizeof(int8_t));
+ return TOSA_USER_ERROR;
+ }
+
+ for (uint32_t i = 0; i < out_size; i++)
+ {
+ int8_t bits = static_cast<int8_t>(in[i * sizeof(int8_t)]);
+ auto f8 = fp8e4m3::from_bits(bits);
+ float val_f32 = static_cast<float>(f8);
+ out.push_back(val_f32);
+ }
+ return TOSA_OK;
+}
+
+tosa_err_t TosaSerializationHandler::ConvertU8toFP8E5M2(const std::vector<uint8_t>& in,
+ uint32_t out_size,
+ std::vector<float>& out)
+{
+ // Note: FP8E5M2 values returned in fp32 type
+ out.clear();
+ if (in.size() < out_size * sizeof(int8_t))
+ {
+ printf("TosaSerializationHandler::ConvertU8toF16(): uint8 buffer size %ld must >= target size %ld\n", in.size(),
+ out_size * sizeof(int8_t));
+ return TOSA_USER_ERROR;
+ }
+
+ for (uint32_t i = 0; i < out_size; i++)
+ {
+ int8_t bits = static_cast<int8_t>(in[i * sizeof(int8_t)]);
+ auto f8 = fp8e5m2::from_bits(bits);
+ float val_f32 = static_cast<float>(f8);
+ out.push_back(val_f32);
+ }
+ return TOSA_OK;
+}
+
tosa_err_t TosaSerializationHandler::ConvertU8toF16(const std::vector<uint8_t>& in,
uint32_t out_size,
std::vector<half_float::half>& out)