You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@mxnet.apache.org by GitBox <gi...@apache.org> on 2019/06/01 18:09:33 UTC
[GitHub] [incubator-mxnet] kshitij12345 commented on a change in pull
request #15120: [bug] fix higher grad log
kshitij12345 commented on a change in pull request #15120: [bug] fix higher grad log
URL: https://github.com/apache/incubator-mxnet/pull/15120#discussion_r289614132
##########
File path: src/operator/tensor/elemwise_unary_op_basic.cc
##########
@@ -1074,16 +1074,19 @@ MXNET_OPERATOR_REGISTER_BINARY_WITH_SPARSE_CPU_DR(_backward_log,
[](const nnvm::NodePtr& n, const std::vector<nnvm::NodeEntry>& ograds) {
// For f(x) -> f = log
// f''(x) = -1 * (f'(x) * f'(x))
- auto gx = nnvm::NodeEntry{n};
+ auto gx_mul_head_grads = nnvm::NodeEntry{n}; // f'(x) * head_grads
+ auto head_grads = nnvm::NodeEntry{n->inputs[0]};
+ auto g_lx = MakeNode("reciprocal", n->attrs.name + "_backward_log_grad",
+ {n->inputs[1]}, nullptr, &n);
auto ggx_mid = MakeNode("elemwise_mul", n->attrs.name + "_backward_mid_grad_grad",
- {gx, gx}, nullptr, &n);
+ {gx_mul_head_grads, nnvm::NodeEntry{g_lx}}, nullptr, &n);
auto ggx = MakeNode("negative", n->attrs.name + "_backward_grad_grad",
{nnvm::NodeEntry{ggx_mid}}, nullptr, &n);
std::vector<nnvm::NodeEntry> ret;
ret.emplace_back(MakeNode("elemwise_mul", n->attrs.name + "_backward_grad_grad",
- {ograds[0], gx}, nullptr, &n));
+ {ograds[0], nnvm::NodeEntry{g_lx}}, nullptr, &n));
Review comment:
I am having trouble with `head_grads.grad` which is being returned as `0's` while I expect it to be this.
Please help.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
With regards,
Apache Git Services