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-rw-r--r--tensorflow/python/training/optimizer.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tensorflow/python/training/optimizer.py b/tensorflow/python/training/optimizer.py
index 1c3ac2d09d..70a3761de1 100644
--- a/tensorflow/python/training/optimizer.py
+++ b/tensorflow/python/training/optimizer.py
@@ -290,7 +290,7 @@ class Optimizer(object):
with ops.op_scope([], name, self._name) as name:
self._prepare()
for grad, var in grads_and_vars:
- if not grad:
+ if grad is None:
continue
# We colocate all ops created in _apply_dense or _apply_sparse
# on the same device as the variable.