Do not set loss@Grad as persistable

Revert part of a3ca4c99eb
7 years ago · 55ff03b7ab
parent 99a77cfc62
commit 55ff03b7ab
1 changed files with 0 additions and 2 deletions
--- a/python/paddle/fluid/backward.py
+++ b/python/paddle/fluid/backward.py
@ -572,8 +572,6 @@ def append_backward(loss, parameter_list=None, no_grad_set=None,

    program.current_block_idx = current_block_idx
    program._sync_with_cpp()
-    # FIXME(zcd): prevent loss.grad optimized by mem_opt.
-    loss.block.var(_append_grad_suffix_(loss.name)).persistable = True

    if parameter_list is not None:
        parameters = parameter_list