| import torch |
| from .Criterion import Criterion |
| |
| |
| class HingeEmbeddingCriterion(Criterion): |
| |
| def __init__(self, margin=1, sizeAverage=True): |
| super(HingeEmbeddingCriterion, self).__init__() |
| self.margin = margin |
| self.sizeAverage = sizeAverage |
| self.buffer = None |
| |
| def updateOutput(self, input, y): |
| if self.buffer is None: |
| self.buffer = input.new() |
| self.buffer.resize_as_(input).copy_(input) |
| self.buffer[torch.eq(y, -1.)] = 0 |
| self.output = self.buffer.sum() |
| |
| self.buffer.fill_(self.margin).add_(-1, input) |
| self.buffer.clamp_(min=0) |
| self.buffer[torch.eq(y, 1.)] = 0 |
| self.output = self.output + self.buffer.sum() |
| |
| if self.sizeAverage: |
| self.output = self.output / input.nelement() |
| |
| return self.output |
| |
| def updateGradInput(self, input, y): |
| self.gradInput.resize_as_(input).copy_(y) |
| self.gradInput[torch.mul(torch.eq(y, -1), torch.gt(input, self.margin))] = 0 |
| |
| if self.sizeAverage: |
| self.gradInput.mul_(1. / input.nelement()) |
| |
| return self.gradInput |
