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# Template Class Int8CacheCalibrator

- Defined in File ptq.h

## Inheritance Relationships

### Base Type

- `private Algorithm`

## Class Documentation

template<typename `Algorithm` >
class `trtorch::ptq `::`` `Int8CacheCalibrator` : private Algorithm

  Generic Int8Calibrator implementation based on a specified TensorRT calibration algorithm that only reads from a calibration file.

  Template Parameters

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

  Public Functions

  `Int8CacheCalibrator` ( const std::string & cache_file_path )

    Construct a new Int 8 Cache Calibrator object.

    Parameters

      - `cache_file_path` :

  int `getBatchSize` ( ) const noexcept override

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

    Return

      int

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

    Get the next Batch.

    Not used always returns false

    Return

      false

    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

  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

    Return

      const void* - Pointer to cache data

    Parameters

      - `length` :

  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

  `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

    Return

      nvinfer1::IInt8Calibrator*