Feature/backward #3068

reyoung · 2017-07-26T08:05:49Z

No description provided.

Remove bool argument, use a class to handle that.

…into feature/backward

…backward

…ture/backward

…into feature/backward

…ture/backward

…into feature/backward

…backward

wangkuiyi · 2017-08-01T03:00:10Z

https://stackoverflow.com/questions/9243646/recursive-functions-two-functions-or-last-optional-parameter/9243666#9243666 BackwardImpl => BackwardRecursive

jacquesqiao · 2017-08-01T03:01:47Z

paddle/operators/fill_zeros_like_op.h

+class FillZerosLikeKernel : public framework::OpKernel {
+public:
+  void Compute(const framework::KernelContext& context) const override {
+    auto* output = context.Output(0)->GetMutable<framework::Tensor>();


auto output

jacquesqiao · 2017-08-01T03:04:49Z

paddle/operators/fill_zeros_like_op.cu

+#include "paddle/operators/fill_zeros_like_op.h"
+
+REGISTER_OP_GPU_KERNEL(
+    fill_zeros_like,


why name this fill_zerors_like, numpy call it zeros_like

zeros_like is not a verb. But all operator should be a verb. I think fill_zeros_like is more explicit.

Also, zeros_like may be implemented without filling anything into memory but a flag. Here named fill indicate that actually a new memory is allocated.

jacquesqiao · 2017-08-01T03:05:48Z

paddle/operators/fill_zeros_like_op.h

+
+template <typename Place, typename T>
+class FillZerosLikeKernel : public framework::OpKernel {
+public:


please add a Python unit test for this operator

We will add the unit test in other PR. @Canpio @dzhwinter

@reyoung get it

jacquesqiao · 2017-08-01T03:16:24Z

paddle/framework/operator.cc

  auto output_format = GetAttr<std::vector<int>>("output_format");
  auto offset = in_out_idxs_->at(name);
-
+  PADDLE_ENFORCE(output_format.at((size_t)offset + 1) <= (int)outputs_.size(),


(int) ==> static_cast

jacquesqiao · 2017-08-01T03:24:04Z

paddle/framework/net_op_test.cc

+  op1->inputs_ = {"x", "w1", "b1"};
+  op1->outputs_ = {"y"};
+  net.AddOp(op1);
+  net.InsertOp(0, op1);


check if the inserted op is in the right place

jacquesqiao · 2017-08-01T03:46:30Z

paddle/framework/backward.cc

+ *
+ * See Backward.h for details
+ */
+static std::shared_ptr<OperatorBase> BackwardImpl(


Is MakeBackwardOp or GetBackwardOp a better name?

Done. BackwardRecursive.

jacquesqiao · 2017-08-01T03:54:20Z

paddle/framework/backward.cc

+  }
+
+  /**
+   * All output gradients of forwarding operator do not need to calculate. Then


add If All output gradient ...

jacquesqiao · 2017-08-01T04:34:50Z

paddle/framework/backward.cc

+           OpRegistry::CreateOp(
+               "add", {dup_outputs}, {name},
+               {{"input_format",
+                 std::vector<int>{0, (int)dup_outputs.size()}}})});


static_cast

jacquesqiao · 2017-08-01T05:32:20Z

paddle/framework/backward.cc

+ *
+ * See Backward.h for details
+ */
+static std::shared_ptr<OperatorBase> BackwardImpl(


This function is not in a class, why need static?

jacquesqiao · 2017-08-01T05:40:39Z

paddle/framework/backward.cc

+
+    //! Map from output gradient variable name to operator's indices in backward
+    //! net. That operator generates that variable.
+    std::unordered_map<std::string, std::vector<size_t>> dup_output_ops;


what is dup mean？

jacquesqiao · 2017-08-01T05:47:02Z

paddle/framework/backward.cc

+namespace paddle {
+namespace framework {
+
+static bool AllInSet(const std::vector<std::string>& names,


Why do we need to use static?

Because we do not export them to global symbols.

jacquesqiao · 2017-08-01T06:15:23Z

paddle/framework/backward.cc

+      insert_position.push_back(
+          {dup_op.back(),
+           OpRegistry::CreateOp(
+               "add", {dup_outputs}, {name},


这个add op现在应该还没实现？

是的。这个Op的实现不影响Backward算法的实现和单测。

jacquesqiao · 2017-08-01T06:51:31Z

paddle/framework/backward_test.cc

+
+  ASSERT_EQ("X" + f::OperatorBase::GRAD_VAR_SUFFIX(),
+            gop->Output("X" + f::OperatorBase::GRAD_VAR_SUFFIX()));
+  //  LOG(INFO) << gop->Output("X" + "@GRAD");


remove unused code

jacquesqiao · 2017-08-01T07:08:42Z

paddle/framework/backward_test.cc

+  auto fwd = f::OpRegistry::CreateOp("rowwise_add", {"X", "b"}, {"Out"}, {});
+  ASSERT_NE(fwd, nullptr);
+  auto gop = f::OpRegistry::CreateGradOp(*fwd);
+  ASSERT_EQ(1UL, gop->inputs_.size());


记得说GradientOp的Input是I,O,OG，这里为什么gop的input size为1？

因为有一些Op的梯度可以不使用I和O，这个在注册的时候注册过了。

jacquesqiao · 2017-08-01T07:11:45Z

paddle/framework/backward_test.cc

+            gop->outputs_.end());
+
+  auto no_input_gop = f::Backward(*fwd, {"X", "b"});
+  ASSERT_NE(no_input_gop, nullptr);


好像没有做任何测试？

…ture/backward

jacquesqiao · 2017-08-01T07:50:14Z

paddle/operators/fill_zeros_like_op.h

@@ -23,8 +23,8 @@ namespace operators {
 template <typename Place, typename T>
 class FillZerosLikeKernel : public framework::OpKernel {
 public:
-  void Compute(const framework::KernelContext& context) const override {
-    auto* output = context.Output(0)->GetMutable<framework::Tensor>();
+  void Compute(const framework::ExecutionContext& context) const override {


framework::xxx ===> xxx

Changed in Next PR

jacquesqiao · 2017-08-01T08:06:35Z

有一些注释的comment，也可以顺便update一下

jacquesqiao

LGTM！except for some typo in comment and doc

reyoung · 2017-08-01T09:01:28Z

@dzhwinter @Canpio @wangkuiyi

I prepare to merge this PR soon, all code-style comments are followed. But it still lacks documentation and comments. But it has been a huge PR already. Documentation and comments will be added in following PR.

reyoung and others added 30 commits July 26, 2017 15:06

Rename PlainNet --> NetOp

b1b4364

Update Backward

ecf23ce

Update Interface

b1b13f8

Refine OpRegistry::AddInput/AddOutput

00615eb

Remove bool argument, use a class to handle that.

Add fill_zeros_like op

a2dc961

Develop backward building precess of single op

e32e306

Refining Unittest

831d4e1

Merge branch 'feature/backward' of https://github.com/reyoung/Paddle …

f77c63b

…into feature/backward

"backward is NetOp"

fa7cbfd

Merge remote-tracking branch 'reyoung/feature/backward' into feature/…

0ac79a3

…backward

"split to generic add PR"

292f2ab

Stash

05d9aff

Merge branch 'feature/backward' of github.com:reyoung/Paddle into fea…

fa6a46a

…ture/backward

Fix compile error

03f418c

Merge branch 'feature/backward' of https://github.com/reyoung/Paddle …

5297bcb

…into feature/backward

Merge branch 'feature/backward' of github.com:reyoung/Paddle into fea…

9475972

…ture/backward

Fix compile error

f9fab14

Add unittest for part_of_output_are_not_need

3d18737

Fix compile errors of FillZerosLikeOp

70bd07a

Stash for canpio

63636d6

Add unitest of Backward.part_of_input_are_not_need

04db418

Stash

28c0281

Merge branch 'feature/backward' of github.com:reyoung/Paddle into fea…

099bb53

…ture/backward

Add unitest of Backward.intermediate_variable_not_need_in_linear_net

3dd5fd0

Add unittest

84198f7

Merge branch 'feature/backward' of https://github.com/reyoung/Paddle …

4461f3c

…into feature/backward

rename test

b1d8419

InsertOp for NetOp

d2583bd

"wait add generic"

b9f2bb3

Merge remote-tracking branch 'reyoung/feature/backward' into feature/…

5713266

…backward

jacquesqiao reviewed Aug 1, 2017

View reviewed changes

reyoung added 3 commits August 1, 2017 15:11

Merge branch 'develop' of github.com:baidu/Paddle into feature/backward

bc146e8

Merge branch 'feature/backward' of github.com:reyoung/Paddle into fea…

80baf86

…ture/backward

Follow comments and merge develop

e2fd2bd

jacquesqiao reviewed Aug 1, 2017

View reviewed changes

jacquesqiao approved these changes Aug 1, 2017

View reviewed changes

Use static_cast, Fix unittest

737ea05

reyoung force-pushed the feature/backward branch from 47dbbdb to 737ea05 Compare August 1, 2017 08:57

reyoung added 2 commits August 1, 2017 19:25

Merge branch 'develop' of github.com:baidu/Paddle into feature/backward

9cc9907

Merge develop

051d6c8

reyoung merged commit 2646ef6 into PaddlePaddle:develop Aug 1, 2017

reyoung deleted the feature/backward branch August 2, 2017 11:35

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Feature/backward #3068

Feature/backward #3068

reyoung commented Jul 26, 2017

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reyoung commented Aug 1, 2017

Feature/backward #3068

Feature/backward #3068

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reyoung commented Jul 26, 2017

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