.. _program_listing_file_src_optimizers_exponential_smoothing.h:

Program Listing for File exponential_smoothing.h
================================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_optimizers_exponential_smoothing.h>` (``src/optimizers/exponential_smoothing.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include "common/definitions.h"
   #include "functional/functional.h"
   #include "tensors/tensor_operators.h"
   #include "common/options.h"
   
   namespace marian {
   
   class ExponentialSmoothing {
   public:
       ExponentialSmoothing(Ptr<Options> options) {
         mvDecayBy_ = options->get<float>("exponential-smoothing", 0);
         refBatchTrgWords_ = options->get<size_t>("mini-batch-words-ref", 0); // adjust as if our MB size (in target labels) was this value
         mvAvg_ = (mvDecayBy_ > 0);
       }
   
   protected:
     void updateAvgParams(Tensor paramsAvg, Tensor params, size_t batches, size_t actualBatchTrgWords);
   
     bool mvAvg_{false};
     float mvDecayBy_{1e-4f};     // decay prior model by this factor
     size_t refBatchTrgWords_{0}; // mvDecayBy_ is specified for this batch size (in target words) (0 means not specified)
   };
   }  // namespace marian