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#ifndef CAFFE2_OPERATORS_CREATE_SCOPE_OP_H_
#define CAFFE2_OPERATORS_CREATE_SCOPE_OP_H_
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "caffe2/core/context.h"
#include "caffe2/core/logging.h"
#include "caffe2/core/operator.h"
#include "caffe2/proto/caffe2_pb.h"
C10_DECLARE_bool(caffe2_workspace_stack_debug);
namespace caffe2 {
namespace detail {
/*
* Keeps track of forward and backward gradient workspaces in stack,
* reuses previously created workspaces, non-thread safe
*/
class TORCH_API WorkspaceStack {
public:
explicit WorkspaceStack() : parent_ws_(nullptr), top_(-1) {}
std::shared_ptr<Workspace> pushForwardWorkspace(Workspace* parent_ws) {
return pushForwardWorkspace(
parent_ws, std::unordered_map<std::string, std::string>());
}
std::shared_ptr<Workspace> pushForwardWorkspace(
Workspace* parent_ws,
const std::unordered_map<std::string, std::string>& blob_bindings) {
checkStack();
if (FLAGS_caffe2_workspace_stack_debug) {
if (parent_ws_) {
CAFFE_ENFORCE_EQ(parent_ws_, parent_ws, "Parent workspace mismatch");
} else {
parent_ws_ = parent_ws;
}
if (!blob_bindings_.empty()) {
checkBindingsMatch(blob_bindings_, blob_bindings);
} else {
blob_bindings_ = blob_bindings;
}
}
if (top_ == workspaces_.size() - 1) {
workspaces_.push_back(
std::make_shared<Workspace>(parent_ws, blob_bindings));
} else {
// when reusing workspace, make sure copies of external blobs are
// removed and blob bindings are set
auto& workspace = workspaces_[top_ + 1];
const auto& local_blobs = workspace->LocalBlobs();
std::unordered_set<std::string> local_blobs_set;
local_blobs_set.insert(local_blobs.begin(), local_blobs.end());
bool found_local_copy = false;
for (const auto& blob_pair : blob_bindings) {
if (local_blobs_set.count(blob_pair.first)) {
workspace->RemoveBlob(blob_pair.first);
found_local_copy = true;
}
}
if (found_local_copy) {
workspace->AddBlobMapping(parent_ws, blob_bindings);
}
}
return workspaces_[++top_];
}
std::shared_ptr<Workspace> popGradientWorkspace(
Workspace* parent_ws,
const std::unordered_map<std::string, std::string>& grad_blob_bindings) {
checkStack();
if (FLAGS_caffe2_workspace_stack_debug) {
if (parent_ws_) {
CAFFE_ENFORCE_EQ(parent_ws_, parent_ws, "Parent workspace mismatch");
} else {
parent_ws_ = parent_ws;
}
if (!grad_blob_bindings_.empty()) {
checkBindingsMatch(grad_blob_bindings_, grad_blob_bindings);
} else {
grad_blob_bindings_ = grad_blob_bindings;
}
}
if (top_ < 0) {
return nullptr;
}
auto& grad_workspace = workspaces_[top_];
grad_workspace->AddBlobMapping(parent_ws, grad_blob_bindings, true);
--top_;
return grad_workspace;
}
std::shared_ptr<Workspace> reuseLastForwardWorkspace(Workspace* parent_ws) {
return reuseLastForwardWorkspace(
parent_ws, std::unordered_map<std::string, std::string>());
}
std::shared_ptr<Workspace> reuseLastForwardWorkspace(
Workspace* parent_ws,
const std::unordered_map<std::string, std::string>& blob_bindings) {
checkStack();
if (top_ < 0) {
return nullptr;
}
workspaces_[top_]->AddBlobMapping(parent_ws, blob_bindings);
return workspaces_[top_];
}
void clear() {
checkStack();
top_ = -1;
}
bool empty() const {
return top_ < 0;
}
private:
void checkStack() const {
CAFFE_ENFORCE_GT(
(int)workspaces_.size(), top_, "Corrupted workspaces stack");
}
void checkBindingsMatch(
const std::unordered_map<std::string, std::string>& bindings,
const std::unordered_map<std::string, std::string>& test_bindings) const {
CAFFE_ENFORCE_EQ(
bindings.size(), test_bindings.size(), "Blob bindings mismatch");
for (const auto& blob_binding : bindings) {
CAFFE_ENFORCE(
test_bindings.count(blob_binding.first), "Blob bindings mismatch");
CAFFE_ENFORCE_EQ(
test_bindings.at(blob_binding.first),
blob_binding.second,
"Blob bindings mismatch");
}
}
std::unordered_map<std::string, std::string> blob_bindings_;
std::unordered_map<std::string, std::string> grad_blob_bindings_;
Workspace* parent_ws_;
int top_;
std::vector<std::shared_ptr<Workspace>> workspaces_;
};
} // namespace detail
template <class Context>
class CreateScopeOp final : public Operator<Context> {
public:
template <class... Args>
explicit CreateScopeOp(Args&&... args)
: Operator<Context>(std::forward<Args>(args)...) {}
USE_OPERATOR_CONTEXT_FUNCTIONS;
bool RunOnDevice() override;
};
template <class Context>
class HasScopeOp final : public Operator<Context> {
public:
template <class... Args>
explicit HasScopeOp(Args&&... args)
: Operator<Context>(std::forward<Args>(args)...) {}
USE_OPERATOR_CONTEXT_FUNCTIONS;
bool RunOnDevice() override;
};
} // namespace caffe2
#endif // CAFFE2_OPERATORS_CREATE_SCOPE_OP_H_
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