1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
#include <torch/csrc/lazy/core/ir_util.h>
#include <c10/util/Logging.h>
namespace torch {
namespace lazy {
std::vector<Node*> Util::ComputePostOrder(const Node* node, EmissionMap* emap) {
std::vector<Node*> post_order;
std::vector<Node*> queue;
// std::vector<const T> to c10::ArrayRef<T> conversion is not supported,
// so we need to drop const in the return vector and use const_cast here.
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
queue.push_back(const_cast<Node*>(node));
while (!queue.empty()) {
node = queue.back();
auto it = emap->find(node);
if (it == emap->end()) {
(*emap)[node] = kEmitting;
for (auto& output : node->operands()) {
auto oit = emap->find(output.node);
if (oit == emap->end()) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
queue.push_back(const_cast<Node*>(output.node));
} else {
TORCH_CHECK(
oit->second != kEmitting,
"Graph loop found at ",
output.node->ToString());
}
}
} else if (it->second == kEmitting) {
for (auto& output : node->operands()) {
auto oit = emap->find(output.node);
TORCH_CHECK(
oit != emap->end() && oit->second == kEmitted,
"Graph loop found at ",
output.node->ToString());
}
(*emap)[node] = kEmitted;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
post_order.push_back(const_cast<Node*>(node));
queue.pop_back();
} else {
TORCH_CHECK(it->second == kEmitted);
queue.pop_back();
}
}
return post_order;
}
std::vector<Node*> Util::ComputePostOrder(
c10::ArrayRef<Node*> nodes,
EmissionMap* emap) {
std::vector<Node*> post_order;
for (auto node : nodes) {
auto node_post_order = ComputePostOrder(node, emap);
post_order.insert(
post_order.end(), node_post_order.begin(), node_post_order.end());
}
return post_order;
}
std::vector<Node*> Util::ComputePostOrder(c10::ArrayRef<Node*> nodes) {
EmissionMap emap;
return ComputePostOrder(nodes, &emap);
}
size_t Util::GetGraphSize(c10::ArrayRef<Node*> nodes) {
return ComputePostOrder(nodes).size();
}
} // namespace lazy
} // namespace torch
|
