piiswrong commented on a change in pull request #7494: gluon save/load
optimizer states
URL: https://github.com/apache/incubator-mxnet/pull/7494#discussion_r135395072
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File path: python/mxnet/gluon/trainer.py
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@@ -158,3 +158,37 @@ def step(self, batch_size, ignore_stale_grad=False):
if not ignore_stale_grad or arr._fresh_grad:
upd(i, grad, arr)
arr._fresh_grad = False
+
+ def save_states(self, fname):
+ """Saves trainer states (e.g. optimizer, momentum) to a file.
+
+ Parameters
+ ----------
+ fname : str
+ Path to output states file.
+ """
+ assert self._optimizer is not None
+
+ if self._update_on_kvstore:
+ self._kvstore.save_optimizer_states(fname, dump_optimizer=True)
+ else:
+ with open(fname, 'wb') as fout:
+ fout.write(self._updaters[0].get_states(dump_optimizer=True))
+
+ def load_states(self, fname):
+ """Loads trainer states (e.g. optimizer, momentum) from a file.
+
+ Parameters
+ ----------
+ fname : str
+ Path to input states file.
+ """
+ if self._update_on_kvstore:
+ self._kvstore.load_optimizer_states(fname)
+ self._optimizer = self._kvstore._updater.optimizer
+ else:
+ with open(fname, 'rb') as f:
+ states = f.read()
+ for updater in self._updaters:
+ updater.set_states(states)
+ self._optimizer = self._updaters[0].optimizer
Review comment:
Do different self._updaters have different optimizer?
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