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- import mindspore.nn as nn
- from mindspore import context
- from mindspore.communication.management import get_group_size
- from mindspore.context import ParallelMode
- import mindspore.ops as ops
- from mindspore.ops import composite as C
- from mindspore.ops import operations as P
- from mindspore.parallel._auto_parallel_context import auto_parallel_context
-
- class TrainingWrapper(nn.Cell):
- '''
- Wraps the network with an optimizer
- Args:
- network (Cell): The training network.
- optimizer (Cell): Optimizer for updating the weights.
- sens (Number): The scaling number to be filled as the input of backpropagation. Default value is 1.0.
- use_global_norm: Whether to use global grad clip norm
- clip_global_norm_value : The value of global clip norm
- '''
-
- # def __init__(self, network, optimizer, sens=1.0, use_global_norm=True, clip_global_norm_value=5.0):
- def __init__(self, network, optimizer, sens=1.0, use_global_norm=True, clip_global_norm_value=2.0):
- super(TrainingWrapper, self).__init__(auto_prefix=False)
- self.network = network
- self.network.set_grad()
- self.weights = optimizer.parameters
- self.optimizer = optimizer
- self.grad = C.GradOperation(get_by_list=True, sens_param=True)
- self.sens = float(sens)
- self.reducer_flag = False
- self.grad_reducer = None
- self.use_global_norm = use_global_norm
- self.clip_global_norm_value = clip_global_norm_value
- self.parallel_mode = context.get_auto_parallel_context("parallel_mode")
- if self.parallel_mode in [ParallelMode.DATA_PARALLEL, ParallelMode.HYBRID_PARALLEL]:
- self.reducer_flag = True
- if self.reducer_flag:
- mean = context.get_auto_parallel_context("gradients_mean")
- if auto_parallel_context().get_device_num_is_set():
- degree = context.get_auto_parallel_context("device_num")
- else:
- degree = get_group_size()
- self.grad_reducer = nn.DistributedGradReducer(optimizer.parameters, mean, degree)
-
- def construct(self, *inputs):
-
- weights = self.weights
- loss = self.network(*inputs)
- sens = P.Fill()(loss.dtype, loss.shape, self.sens)
- grads = self.grad(self.network, weights)(*inputs, sens)
- if self.reducer_flag:
- grads = self.grad_reducer(grads)
- if self.use_global_norm:
- grads = C.clip_by_global_norm(grads, clip_norm=self.clip_global_norm_value)
- loss = ops.depend(loss, self.optimizer(grads))
- return loss
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