| class EMA: | |
| def __init__(self, model, decay): | |
| self.model = model | |
| self.decay = decay | |
| self.shadow = {} | |
| self.backup = {} | |
| def register(self): | |
| for name, param in self.model.named_parameters(): | |
| if param.requires_grad: | |
| self.shadow[name] = param.data.clone() | |
| def update(self): | |
| for name, param in self.model.named_parameters(): | |
| if name in self.shadow: | |
| new_average = (1.0 - self.decay) * param.data + self.decay * self.shadow[name] | |
| self.shadow[name] = new_average.clone() | |
| def apply_shadow(self): | |
| for name, param in self.model.named_parameters(): | |
| if name in self.shadow: | |
| self.backup[name] = param.data | |
| param.data = self.shadow[name] | |
| def restore(self): | |
| for name, param in self.model.named_parameters(): | |
| if name in self.shadow: | |
| param.data = self.backup[name] | |
| self.backup = {} | |