-class VignetteSet:
- def __init__(self, problem_number, nb_batches):
- self.batch_size = args.batch_size
- self.problem_number = problem_number
- self.nb_batches = nb_batches
- self.nb_samples = self.nb_batches * self.batch_size
- self.targets = []
- self.inputs = []
-
- acc = 0.0
- acc_sq = 0.0
-
- for k in range(0, self.nb_batches):
- target = torch.LongTensor(self.batch_size).bernoulli_(0.5)
- input = svrt.generate_vignettes(problem_number, target)
- input = input.float().view(input.size(0), 1, input.size(1), input.size(2))
- if torch.cuda.is_available():
- input = input.cuda()
- target = target.cuda()
- acc += input.float().sum() / input.numel()
- acc_sq += input.float().pow(2).sum() / input.numel()
- self.targets.append(target)
- self.inputs.append(input)
-
- mean = acc / self.nb_batches
- std = math.sqrt(acc_sq / self.nb_batches - mean * mean)
- for k in range(0, self.nb_batches):
- self.inputs[k].sub_(mean).div_(std)
-
- def get_batch(self, b):
- return self.inputs[b], self.targets[b]
-
-class CompressedVignetteSet:
- def __init__(self, problem_number, nb_batches):
- self.batch_size = args.batch_size
- self.problem_number = problem_number
- self.nb_batches = nb_batches
- self.nb_samples = self.nb_batches * self.batch_size
- self.targets = []
- self.input_storages = []
-
- acc = 0.0
- acc_sq = 0.0
- for k in range(0, self.nb_batches):
- target = torch.LongTensor(self.batch_size).bernoulli_(0.5)
- input = svrt.generate_vignettes(problem_number, target)
- acc += input.float().sum() / input.numel()
- acc_sq += input.float().pow(2).sum() / input.numel()
- self.targets.append(target)
- self.input_storages.append(svrt.compress(input.storage()))
-
- self.mean = acc / self.nb_batches
- self.std = math.sqrt(acc_sq / self.nb_batches - self.mean * self.mean)
-
- def get_batch(self, b):
- input = torch.ByteTensor(svrt.uncompress(self.input_storages[b])).float()
- input = input.view(self.batch_size, 1, 128, 128).sub_(self.mean).div_(self.std)
- target = self.targets[b]
-
- if torch.cuda.is_available():
- input = input.cuda()
- target = target.cuda()
-
- return input, target