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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 = {}
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