Class: Chainer::Training::Extensions::LogReport

Inherits:
Chainer::Training::Extension show all
Defined in:
lib/chainer/training/extensions/log_report.rb

Constant Summary

Constants inherited from Chainer::Training::Extension

Chainer::Training::Extension::PRIORITY_EDITOR, Chainer::Training::Extension::PRIORITY_READER, Chainer::Training::Extension::PRIORITY_WRITER

Instance Attribute Summary collapse

Attributes inherited from Chainer::Training::Extension

#name, #priority, #trigger

Instance Method Summary collapse

Methods inherited from Chainer::Training::Extension

#default_name

Constructor Details

#initialize(keys: nil, trigger: [1, 'epoch'], postprocess: nil, log_name: 'log') ⇒ LogReport

Returns a new instance of LogReport.



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# File 'lib/chainer/training/extensions/log_report.rb', line 10

def initialize(keys: nil, trigger: [1, 'epoch'], postprocess: nil, log_name: 'log')
  @keys = keys
  @_trigger = Chainer::Training::Util.get_trigger(trigger)
  @postprocess = postprocess
  @log_name = log_name
  @log = []

  init_summary
end

Instance Attribute Details

#log ⇒ Object (readonly)

Returns the value of attribute log.



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# File 'lib/chainer/training/extensions/log_report.rb', line 8

def log
  @log
end

Instance Method Details

#call(trainer) ⇒ Object 



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# File 'lib/chainer/training/extensions/log_report.rb', line 20

def call(trainer)
  observation = trainer.observation

  if @keys.nil?
    @summary.add(observation)
  else
    symbolized_observation = Hash[observation.map{|(k,v)| [k.to_sym,v]}]
    filterd_keys = @keys.select {|k| observation.keys.include?(k.to_sym) }
    @summary.add(filterd_keys.each_with_object({}) {|k, hash| hash[k.to_s] = observation[k.to_sym] })
  end

  # if @_trigger is true, output the result
  return unless @_trigger.(trainer)

  stats = @summary.compute_mean
  stats_cpu = {}
  stats.each do |name, value|
    stats_cpu[name] = value.to_f  # copy to CPU
  end

  updater = trainer.updater
  stats_cpu['epoch'] = updater.epoch
  stats_cpu['iteration'] = updater.iteration
  stats_cpu['elapsed_time'] = trainer.elapsed_time

  @postprocess.(stats_cpu) unless @postprocess.nil?

  @log << stats_cpu

  unless @log_name.nil?
    # example: sprintf("%{a}, %{b}", {a: "1", b: "2"})
    # => "1, 2"
    log_name = sprintf(@log_name, stats_cpu)
    temp_file = Tempfile.create(basename: log_name, tmpdir: trainer.out)

    JSON.dump(@log, temp_file)

    new_path = File.join(trainer.out, log_name)
    FileUtils.mv(temp_file.path, new_path)
  end

  init_summary
end

#serialize(serializer) ⇒ Object 



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# File 'lib/chainer/training/extensions/log_report.rb', line 64

def serialize(serializer)
  if @_trigger.respond_to?(:serialize)
    @_trigger.serialize(serializer['_trigger'])
  end
  # Note that this serialization may lose some information of small
  # numerical differences.
  if serializer.is_a?(Chainer::Serializer)
    log = JSON.generate(@log)
    serializer.('_log', log)
  else
    log = serializer.('_log', '')
    @log = JSON.parse(log)
  end
end