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Posted to commits@mxnet.apache.org by GitBox <gi...@apache.org> on 2018/11/07 18:10:44 UTC
[GitHub] szha closed pull request #13121: Set correct update on kvstore flag
in dist_device_sync mode (v1.3.x)
szha closed pull request #13121: Set correct update on kvstore flag in dist_device_sync mode (v1.3.x)
URL: https://github.com/apache/incubator-mxnet/pull/13121
This is a PR merged from a forked repository.
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diff --git a/python/mxnet/gluon/trainer.py b/python/mxnet/gluon/trainer.py
index 028e6607510..c4d49e82c90 100644
--- a/python/mxnet/gluon/trainer.py
+++ b/python/mxnet/gluon/trainer.py
@@ -194,14 +194,18 @@ def _init_kvstore(self):
if config['update_on_kvstore'] is not None:
update_on_kvstore = config['update_on_kvstore']
+
if kvstore:
if self._compression_params:
kvstore.set_gradient_compression(self._compression_params)
self._distributed = 'dist' in kvstore.type
if self._distributed:
# kv.pull(row_sparse_grad) is not supported for dist kvstore
+ # Captures condition for dist_async, dist_device_sync or based on config for
+ # update_on_kvstore
update_on_kvstore = self._contains_sparse_weight or self._contains_sparse_grad \
- or 'async' in kvstore.type
+ or 'device' in kvstore.type or 'async' in kvstore.type \
+ or config['update_on_kvstore']
if update_on_kvstore:
# optimizer preferably needs to be set before init for multiprecision
kvstore.set_optimizer(self._optimizer)
@@ -269,13 +273,20 @@ def step(self, batch_size, ignore_stale_grad=False):
If true, ignores Parameters with stale gradient (gradient that has not
been updated by `backward` after last step) and skip update.
"""
+ rescale_grad = self._scale / batch_size
+ if self._update_on_kvstore and self._distributed and \
+ self._optimizer.rescale_grad != rescale_grad:
+ raise UserWarning('Possible change in the `batch_size` from previous `step` detected.' \
+ 'Optimizer gradient normalizing factor will not change w.r.t new batch_size when ' \
+ 'update_on_kvstore=True and when distributed `kvstore` is used.')
+
+ self._optimizer.rescale_grad = rescale_grad
+
if not self._kv_initialized:
self._init_kvstore()
if self._params_to_init:
self._init_params()
- self._optimizer.rescale_grad = self._scale / batch_size
-
self._allreduce_grads()
self._update(ignore_stale_grad)
diff --git a/tests/nightly/dist_device_sync_kvstore.py b/tests/nightly/dist_device_sync_kvstore.py
index 75b48f42c5e..7fd0333aea7 100644
--- a/tests/nightly/dist_device_sync_kvstore.py
+++ b/tests/nightly/dist_device_sync_kvstore.py
@@ -90,6 +90,25 @@ def check_init(kv, cur_keys, cur_shape, device=False):
my_rank = kv.rank
print('worker ' + str(my_rank) + ' is initialized')
+def test_gluon_trainer_type():
+ def check_trainer_kv_update(update_on_kv):
+ params = mx.gluon.ParameterDict()
+ x = params.get('x', shape=(10,1), lr_mult=1.0)
+ params.initialize(ctx=[mx.cpu(0), mx.cpu(1)], init='zeros')
+ try:
+ trainer = mx.gluon.Trainer(params, 'sgd', {'learning_rate': 0.1}, kvstore=kv, update_on_kvstore=update_on_kv)
+ trainer._init_kvstore()
+ assert trainer._kv_initialized
+ assert trainer._update_on_kvstore is True
+ except ValueError:
+ assert update_on_kv is False
+
+ check_trainer_kv_update(False)
+ check_trainer_kv_update(True)
+ check_trainer_kv_update(None)
+ my_rank = kv.rank
+ print('worker ' + str(my_rank) + ' passed test_gluon_trainer_type')
+
if __name__ == "__main__":
test_sync_init()
test_sync_push_pull()
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