Template Class Int8Calibrator

Inheritance Relationships

Base Type

  • private Algorithm

Class Documentation

template < typename Algorithm , typename DataLoaderUniquePtr >
class torch_tensorrt :: ptq :: Int8Calibrator : private Algorithm

Generic Int8Calibrator implementation based on a specified TensorRT calibration algorithm and a LibTorch DataLoader.

tparam Algorithm

class nvinfer1::IInt8Calibrator (Default: nvinfer1::IInt8EntropyCalibrator2) - Algorithm to use

tparam DataLoaderUniquePtr

std::unique_ptr<torch::data::DataLoader> - DataLoader type

Public Functions

inline Int8Calibrator ( DataLoaderUniquePtr dataloader , const std :: string & cache_file_path , bool use_cache )

Construct a new Int8Calibrator object.

Using the provided DataLoader, construct a calibrator that can be used for PTQ with Torch-TensorRT

Parameters
  • dataloader – std::unqiue_ptr<torch::data::DataLoader> - A unique pointer to the DataLoader, should be what is returned from the make_data_loader factory

  • cache_file_path – const std::string& - A path to store / find the calibration cache

  • use_cache – : bool - Whether to use the cache (if it exists)

inline int getBatchSize ( ) const noexcept override

Get the Batch Size for the next batch (always 1 due to issues with TRT and explicit batch)

Returns

int

inline bool getBatch ( void * bindings [ ] , const char * names [ ] , int nbBindings ) noexcept override

Get the next Batch.

Parameters
  • bindings – void*[] - An array of binding pointers (fed in from TensorRT calibrator), these buffers should be filed with batch data for each input

  • names – const char*[] - Names of bindings

  • nbBindings – int - Number of bindings

Returns

true - There is a new batch for the calibrator to consume

Returns

false - There is not a new batch for the calibrator to consume

inline const void * readCalibrationCache ( size_t & length ) noexcept override

Read calibration cache.

How to read from the calibration cache, only enabled if use_cache is set

Parameters

length

Returns

const void* - Pointer to cache data

inline void writeCalibrationCache ( const void * cache , size_t length ) noexcept override

Write calibration cache.

Write a the calibration cache provided by TensorRT to a specified file

Parameters
  • cache – const void* - cache data

  • length – size_t - length of cache

inline operator nvinfer1 :: IInt8Calibrator * ( )

operator to cast to nvinfer1::IInt8Calibrator*

Convience function to convert to a IInt8Calibrator* to easily be assigned to the ptq_calibrator field in CompileSpec

Returns

nvinfer1::IInt8Calibrator*