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import time
import torch
from detectron2.engine import SimpleTrainer
from typing import Iterable, Generator
def cycle(iterable: Iterable) -> Generator:
while True:
for item in iterable:
yield item
class CycleTrainer(SimpleTrainer):
def __init__(
self,
model,
data_loader,
optimizer,
gather_metric_period=1,
zero_grad_before_forward=False,
async_write_metrics=False,
):
super().__init__(
model,
data_loader,
optimizer,
gather_metric_period,
zero_grad_before_forward,
async_write_metrics,
)
@property
def _data_loader_iter(self):
# only create the data loader iterator when it is used
if self._data_loader_iter_obj is None:
self._data_loader_iter_obj = cycle(self.data_loader)
return self._data_loader_iter_obj
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