forked from jiuyuan/InfiniTensor
38 lines
922 B
C++
38 lines
922 B
C++
#pragma once
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#include "common.h"
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#include "expr.h"
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#include <iostream>
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namespace nnet {
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class PermutationGenerator {
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vector<vector<Iterator>> from, to;
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vector<vector<size_t>> mapping;
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public:
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PermutationGenerator(vector<vector<Iterator>> _from,
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vector<vector<Iterator>> _to);
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bool next();
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PtrMap<Iterator, Iterator> get() const;
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};
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template <typename T> class SubsetGenerator {
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vector<T> elements;
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int n, bitmap;
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public:
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SubsetGenerator(vector<T> elements, bool nonEmpty = 1)
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: elements(elements), n(elements.size()), bitmap((nonEmpty > 0)) {
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assert(n < 10);
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};
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bool next() { return ((++bitmap) < (1 << n) - 1); }
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vector<T> get() const {
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vector<T> ret;
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for (int i = 0; i < n; ++i)
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if (bitmap & (1 << i))
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ret.emplace_back(elements[i]);
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return ret;
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}
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};
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} // namespace nnet
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