Class: Torch::Optim::LRScheduler::MultiplicativeLR

Inherits:
LRScheduler
  • Object
show all
Defined in:
lib/torch/optim/lr_scheduler/multiplicative_lr.rb

Instance Method Summary collapse

Methods inherited from LRScheduler

#step

Constructor Details

#initialize(optimizer, lr_lambda, last_epoch: -1)) ⇒ MultiplicativeLR

Returns a new instance of MultiplicativeLR.



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# File 'lib/torch/optim/lr_scheduler/multiplicative_lr.rb', line 5

def initialize(optimizer, lr_lambda, last_epoch: -1)
  @optimizer = optimizer

  if !lr_lambda.is_a?(Array)
    @lr_lambdas = [lr_lambda] * optimizer.param_groups.length
  else
    if lr_lambda.length != optimizer.param_groups.length
      raise ArgumentError, "Expected #{optimizer.param_groups.length}, but got #{lr_lambda.length}"
    end
    @lr_lambdas = lr_lambda
  end
  @last_epoch = last_epoch
  super(optimizer, last_epoch)
end

Instance Method Details

#get_lr ⇒ Object 



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# File 'lib/torch/optim/lr_scheduler/multiplicative_lr.rb', line 20

def get_lr
  if @last_epoch > 0
    @lr_lambdas.zip(@optimizer.param_groups).map do |lmbda, group|
      group[:lr] * lmbda.call(@last_epoch)
    end
  else
    @base_lrs
  end
end