#pragma once
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#include <vector>
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#include "caffe2/core/context.h"
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#include "caffe2/core/operator.h"
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#include "caffe2/utils/math.h"
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namespace caffe2 {
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template <typename T, class Context>
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class KeySplitOp : public Operator<Context> {
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public:
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USE_OPERATOR_CONTEXT_FUNCTIONS;
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template <class... Args>
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explicit KeySplitOp(Args&&... args)
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: Operator<Context>(std::forward<Args>(args)...),
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categorical_limit_(
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this->template GetSingleArgument<int>("categorical_limit", 0)) {
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CAFFE_ENFORCE_GT(categorical_limit_, 0);
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}
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bool RunOnDevice() override {
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auto& keys = Input(0);
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int N = keys.numel();
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const T* keys_data = keys.template data<T>();
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std::vector<int> counts(categorical_limit_);
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std::vector<int*> eids(categorical_limit_);
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for (int k = 0; k < categorical_limit_; k++) {
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counts[k] = 0;
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}
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for (int i = 0; i < N; i++) {
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int k = keys_data[i];
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CAFFE_ENFORCE_GT(categorical_limit_, k);
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CAFFE_ENFORCE_GE(k, 0);
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counts[k]++;
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}
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for (int k = 0; k < categorical_limit_; k++) {
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auto* eid = Output(k, {counts[k]}, at::dtype<int>());
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eids[k] = eid->template mutable_data<int>();
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counts[k] = 0;
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}
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for (int i = 0; i < N; i++) {
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int k = keys_data[i];
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eids[k][counts[k]++] = i;
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}
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return true;
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}
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private:
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int categorical_limit_;
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};
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} // namespace caffe2
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