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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Wav2LetterPostprocess.hpp"
#include "Wav2LetterModel.hpp"
namespace arm {
namespace app {
namespace audio {
namespace asr {
Postprocess::Postprocess(const uint32_t contextLen,
const uint32_t innerLen,
const uint32_t blankTokenIdx)
: _m_contextLen(contextLen),
_m_innerLen(innerLen),
_m_totalLen(2 * this->_m_contextLen + this->_m_innerLen),
_m_countIterations(0),
_m_blankTokenIdx(blankTokenIdx)
{}
bool Postprocess::Invoke(TfLiteTensor* tensor,
const uint32_t axisIdx,
const bool lastIteration)
{
/* Basic checks. */
if (!this->_IsInputValid(tensor, axisIdx)) {
return false;
}
/* Irrespective of tensor type, we use unsigned "byte" */
uint8_t* ptrData = tflite::GetTensorData<uint8_t>(tensor);
const uint32_t elemSz = this->_GetTensorElementSize(tensor);
/* Other sanity checks. */
if (0 == elemSz) {
printf_err("Tensor type not supported for post processing\n");
return false;
} else if (elemSz * this->_m_totalLen > tensor->bytes) {
printf_err("Insufficient number of tensor bytes\n");
return false;
}
/* Which axis do we need to process? */
switch (axisIdx) {
case arm::app::Wav2LetterModel::ms_outputRowsIdx:
return this->_EraseSectionsRowWise(ptrData,
elemSz * tensor->dims->data[arm::app::Wav2LetterModel::ms_outputColsIdx],
lastIteration);
case arm::app::Wav2LetterModel::ms_outputColsIdx:
return this->_EraseSectionsColWise(ptrData,
elemSz * tensor->dims->data[arm::app::Wav2LetterModel::ms_outputRowsIdx],
lastIteration);
default:
printf_err("Unsupported axis index: %u\n", axisIdx);
}
return false;
}
bool Postprocess::_IsInputValid(TfLiteTensor* tensor,
const uint32_t axisIdx) const
{
if (nullptr == tensor) {
return false;
}
if (static_cast<int>(axisIdx) >= tensor->dims->size) {
printf_err("Invalid axis index: %u; Max: %d\n",
axisIdx, tensor->dims->size);
return false;
}
if (static_cast<int>(this->_m_totalLen) !=
tensor->dims->data[axisIdx]) {
printf_err("Unexpected tensor dimension for axis %d, \n",
tensor->dims->data[axisIdx]);
return false;
}
return true;
}
uint32_t Postprocess::_GetTensorElementSize(TfLiteTensor* tensor)
{
switch(tensor->type) {
case kTfLiteUInt8:
return 1;
case kTfLiteInt8:
return 1;
case kTfLiteInt16:
return 2;
case kTfLiteInt32:
return 4;
case kTfLiteFloat32:
return 4;
default:
printf_err("Unsupported tensor type %s\n",
TfLiteTypeGetName(tensor->type));
}
return 0;
}
bool Postprocess::_EraseSectionsRowWise(
uint8_t* ptrData,
const uint32_t strideSzBytes,
const bool lastIteration)
{
/* In this case, the "zero-ing" is quite simple as the region
* to be zeroed sits in contiguous memory (row-major). */
const uint32_t eraseLen = strideSzBytes * this->_m_contextLen;
/* Erase left context? */
if (this->_m_countIterations > 0) {
/* Set output of each classification window to the blank token. */
std::memset(ptrData, 0, eraseLen);
for (size_t windowIdx = 0; windowIdx < this->_m_contextLen; windowIdx++) {
ptrData[windowIdx*strideSzBytes + this->_m_blankTokenIdx] = 1;
}
}
/* Erase right context? */
if (false == lastIteration) {
uint8_t * rightCtxPtr = ptrData + (strideSzBytes * (this->_m_contextLen + this->_m_innerLen));
/* Set output of each classification window to the blank token. */
std::memset(rightCtxPtr, 0, eraseLen);
for (size_t windowIdx = 0; windowIdx < this->_m_contextLen; windowIdx++) {
rightCtxPtr[windowIdx*strideSzBytes + this->_m_blankTokenIdx] = 1;
}
}
if (lastIteration) {
this->_m_countIterations = 0;
} else {
++this->_m_countIterations;
}
return true;
}
bool Postprocess::_EraseSectionsColWise(
uint8_t* ptrData,
const uint32_t strideSzBytes,
const bool lastIteration)
{
/* Not implemented. */
UNUSED(ptrData);
UNUSED(strideSzBytes);
UNUSED(lastIteration);
return false;
}
} /* namespace asr */
} /* namespace audio */
} /* namespace app */
} /* namespace arm */
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