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体验新版 GitCode,发现更多精彩内容 >>
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7ae73e33
编写于
7月 30, 2018
作者:
Z
Zhaolong Xing
提交者:
GitHub
7月 30, 2018
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差异文件
Merge pull request #12432 from Superjomn/fea/analysis-ssa
inference analysis supports SSA
上级
271b7246
15c2f1ab
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
18 addition
and
5 deletion
+18
-5
paddle/fluid/inference/analysis/data_flow_graph.h
paddle/fluid/inference/analysis/data_flow_graph.h
+2
-0
paddle/fluid/inference/analysis/fluid_to_data_flow_graph_pass.cc
...fluid/inference/analysis/fluid_to_data_flow_graph_pass.cc
+15
-4
paddle/fluid/inference/analysis/fluid_to_data_flow_graph_pass.h
.../fluid/inference/analysis/fluid_to_data_flow_graph_pass.h
+1
-1
未找到文件。
paddle/fluid/inference/analysis/data_flow_graph.h
浏览文件 @
7ae73e33
...
...
@@ -36,6 +36,8 @@ namespace analysis {
/*
* DataFlowGraph - A container of Value and Function Nodes.
*
* This is the base graph for any other type of graphs, such as SSA or CFG.
*/
struct
DataFlowGraph
{
NodeMap
nodes
;
...
...
paddle/fluid/inference/analysis/fluid_to_data_flow_graph_pass.cc
浏览文件 @
7ae73e33
...
...
@@ -40,6 +40,8 @@ void FluidToDataFlowGraphPass::Run(DataFlowGraph *graph) {
PADDLE_ENFORCE
(
graph
);
PADDLE_ENFORCE
(
desc_
);
// insert vars
// The `var2id` keeps a map from a variable's name to its Node-id, the Node-id
// will keep updating to its latest alias during the graph-building.
std
::
unordered_map
<
std
::
string
,
size_t
>
var2id
;
auto
&
main_block
=
desc_
->
blocks
(
framework
::
kRootBlockIndex
);
for
(
int
i
=
0
;
i
<
main_block
.
vars_size
();
i
++
)
{
...
...
@@ -51,6 +53,15 @@ void FluidToDataFlowGraphPass::Run(DataFlowGraph *graph) {
var2id
[
var
.
name
()]
=
v
->
id
();
}
// The variables in a SSA can only write once, so if a variable is written
// multiple times(quite common in our ProgramDesc design), multiple alias
// Nodes of this variable will be created, and each will just write once.
// An set that keep all the names of the variables(the original, not alias)
// that have been written(as outputs). Once an Op's output variable hit the
// set, it should create a new alias and update the global alias for this
// variable. And that make a Data Flow Graph a SSA.
std
::
unordered_set
<
Node
*>
unique_written_vars
;
for
(
int
i
=
0
;
i
<
main_block
.
ops_size
();
i
++
)
{
const
auto
&
op
=
main_block
.
ops
(
i
);
auto
*
o
=
graph
->
nodes
.
Create
(
Node
::
Type
::
kFunction
);
...
...
@@ -62,33 +73,33 @@ void FluidToDataFlowGraphPass::Run(DataFlowGraph *graph) {
o
->
SetPbMsg
(
op
.
SerializeAsString
());
// set inputs and outputs
std
::
unordered_set
<
Node
*>
inlinks
;
for
(
int
j
=
0
;
j
<
op
.
inputs_size
();
j
++
)
{
auto
&
in_var
=
op
.
inputs
(
j
);
for
(
int
k
=
0
;
k
<
in_var
.
arguments_size
();
k
++
)
{
auto
*
in
=
graph
->
nodes
.
GetMutable
(
var2id
.
at
(
in_var
.
arguments
(
k
)));
in
->
outlinks
.
push_back
(
o
);
o
->
inlinks
.
push_back
(
in
);
inlinks
.
insert
(
in
);
}
}
for
(
int
j
=
0
;
j
<
op
.
outputs_size
();
j
++
)
{
auto
&
out_var
=
op
.
outputs
(
j
);
for
(
int
k
=
0
;
k
<
out_var
.
arguments_size
();
k
++
)
{
auto
*
out
=
graph
->
nodes
.
GetMutable
(
var2id
[
out_var
.
arguments
(
k
)]);
if
(
inlink
s
.
count
(
out
))
{
if
(
unique_written_var
s
.
count
(
out
))
{
// Loop found, for example, a = op(a), use SSA, change to a1 = op(a).
auto
*
out_alias
=
graph
->
nodes
.
Create
(
Node
::
Type
::
kValue
);
out_alias
->
SetName
(
out
->
name
());
out_alias
->
SetPbDesc
(
out
->
pb_desc
());
out_alias
->
SetPbMsg
(
out
->
pb_msg
());
var2id
[
out_alias
->
name
()]
=
out_alias
->
id
();
// update a -> a0
var2id
[
out_alias
->
name
()]
=
out_alias
->
id
();
// update variable's alias Node
LOG
(
INFO
)
<<
"loop found in graph, create SSA alias node ["
<<
out_alias
->
repr
()
<<
"] for ["
<<
out
->
repr
()
<<
"]"
;
out
=
out_alias
;
}
out
->
inlinks
.
push_back
(
o
);
o
->
outlinks
.
push_back
(
out
);
unique_written_vars
.
insert
(
out
);
}
}
}
...
...
paddle/fluid/inference/analysis/fluid_to_data_flow_graph_pass.h
浏览文件 @
7ae73e33
...
...
@@ -30,7 +30,7 @@ namespace inference {
namespace
analysis
{
/*
* Transform a FluidDesc to a
data flow graph
.
* Transform a FluidDesc to a
SSA
.
*/
class
FluidToDataFlowGraphPass
final
:
public
DataFlowGraphPass
{
public:
...
...
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