NnetDiscriminativeExampleStructureHasher Struct Reference

This hashing object hashes just the structural aspects of the NnetExample without looking at the value of the features. More...

#include <nnet-discriminative-example.h>

Public Member Functions
size_t	operator() (const NnetDiscriminativeExample &eg) const noexcept
size_t	operator() (const NnetDiscriminativeExample *eg) const noexcept

Detailed Description

This hashing object hashes just the structural aspects of the NnetExample without looking at the value of the features.

It will be used in combining egs into batches of all similar structure.

Definition at line 136 of file nnet-discriminative-example.h.

Member Function Documentation

operator()() [1/2]

size_t operator() ( const NnetDiscriminativeExample &  eg ) const

noexcept

Definition at line 393 of file nnet-discriminative-example.cc.

References rnnlm::i, NnetDiscriminativeSupervision::indexes, and NnetDiscriminativeSupervision::name.

                                                        {
  // these numbers were chosen at random from a list of primes.
  NnetIoStructureHasher io_hasher;
  size_t size = eg.inputs.size(), ans = size * 35099;
  for (size_t i = 0; i < size; i++)
    ans = ans * 19157 + io_hasher(eg.inputs[i]);
  for (size_t i = 0; i < eg.outputs.size(); i++) {
    const NnetDiscriminativeSupervision &sup = eg.outputs[i];
    StringHasher string_hasher;
    IndexVectorHasher indexes_hasher;
    ans = ans * 17957 +
        string_hasher(sup.name) + indexes_hasher(sup.indexes);
  }
  return ans;
}

operator()() [2/2]

size_t operator() ( const NnetDiscriminativeExample *  eg ) const

inlinenoexcept

Definition at line 139 of file nnet-discriminative-example.h.

                                                                          {
    return (*this)(*eg);
  }

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The documentation for this struct was generated from the following files:

• nnet3/nnet-discriminative-example.h
• nnet3/nnet-discriminative-example.cc