zhreshold commented on a change in pull request #17530: Add deferred compute
support
URL: https://github.com/apache/incubator-mxnet/pull/17530#discussion_r384191115
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File path: src/imperative/imperative.cc
##########
@@ -544,4 +705,60 @@ std::vector<NDArray*> Imperative::Backward(
return {};
}
+Imperative::DCInfo::DCInfo(const std::vector<NDArray *> &inputs,
+ const std::vector<NDArray *> &outputs) {
+ this->inputs_.reserve(inputs.size());
+ this->input_handles_.reserve(inputs.size());
+ for (const NDArray *arr : inputs) {
+ CHECK(!arr->is_none());
+ this->inputs_.push_back(*arr);
+ this->input_handles_.push_back(arr);
+ }
+
+ this->outputs_.reserve(outputs.size());
+ for (const NDArray *arr : outputs) {
+ CHECK(!arr->is_none());
+ this->outputs_.push_back(*arr);
+ }
+}
+
+Imperative::DCInfo &
+Imperative::DCInfo::Create(const nnvm::ObjectPtr &node,
+ const std::vector<NDArray *> &inputs,
+ const std::vector<NDArray *> &outputs) {
+ node->info.construct<DCInfo>(inputs, outputs);
+ return Imperative::DCInfo::Get(node);
+}
+
+void Imperative::DCInfo::Compute(const NDArray &arr) {
+ if (Imperative::DCInfo::IsComputed(arr))
+ return;
+
+ DCInfo &info = Imperative::DCInfo::Get(arr.deferredcompute_entry_.node);
+ info.is_computed_ = true; // We will Invoke at the end of this function.
+
+ // Recursively compute input arrays
+ for (const NDArray &input : info.inputs_) {
+ Compute(input);
+ }
+
+ // Prepare pointers
+ std::vector<NDArray *> ndinputs, ndoutputs;
+ ndinputs.reserve(info.inputs_.size());
+ ndoutputs.reserve(info.outputs_.size());
+ for (NDArray &input : info.inputs_)
+ ndinputs.push_back(&input);
Review comment:
thx
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