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Merge pull request #6 from csukuangfj/fangjun-fsa-util
implement GetEnteringArcs.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,43 @@ | ||
| // k2/csrc/fsa_util.cc | ||
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| // Copyright (c) 2020 Fangjun Kuang ([email protected]) | ||
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| // See ../../LICENSE for clarification regarding multiple authors | ||
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| #include "k2/csrc/fsa_util.h" | ||
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| #include <utility> | ||
| #include <vector> | ||
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| namespace k2 { | ||
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| void GetEnteringArcs(const Fsa &fsa, VecOfVec *entering_arcs) { | ||
| // CHECK(CheckProperties(fsa, KTopSorted)); | ||
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| int num_states = fsa.NumStates(); | ||
| std::vector<std::vector<std::pair<Label, StateId>>> vec(num_states); | ||
| int num_arcs = 0; | ||
| for (const auto &arc : fsa.arcs) { | ||
| auto src_state = arc.src_state; | ||
| auto dest_state = arc.dest_state; | ||
| auto label = arc.label; | ||
| vec[dest_state].emplace_back(label, src_state); | ||
| ++num_arcs; | ||
| } | ||
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| auto &ranges = entering_arcs->ranges; | ||
| auto &values = entering_arcs->values; | ||
| ranges.reserve(num_states); | ||
| values.reserve(num_arcs); | ||
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| int32_t start = 0; | ||
| int32_t end = 0; | ||
| for (const auto &label_state : vec) { | ||
| values.insert(values.end(), label_state.begin(), label_state.end()); | ||
| start = end; | ||
| end += static_cast<int32_t>(label_state.size()); | ||
| ranges.push_back({start, end}); | ||
| } | ||
| } | ||
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| } // namespace k2 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,68 @@ | ||
| // k2/csrc/fsa_util_test.cc | ||
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| // Copyright (c) 2020 Fangjun Kuang ([email protected]) | ||
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| // See ../../LICENSE for clarification regarding multiple authors | ||
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| #include "k2/csrc/fsa_util.h" | ||
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| #include <utility> | ||
| #include <vector> | ||
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| #include "gtest/gtest.h" | ||
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| namespace k2 { | ||
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| TEST(FsaUtil, GetEnteringArcs) { | ||
| std::vector<Arc> arcs = { | ||
| {0, 1, 2}, {0, 2, 1}, {1, 2, 0}, {1, 3, 5}, {2, 3, 6}, | ||
| }; | ||
| std::vector<Range> leaving_arcs = { | ||
| {0, 2}, {2, 4}, {4, 5}, {0, 0}, // the last state has no entering arcs | ||
| }; | ||
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| Fsa fsa; | ||
| fsa.leaving_arcs = std::move(leaving_arcs); | ||
| fsa.arcs = std::move(arcs); | ||
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| VecOfVec entering_arcs; | ||
| GetEnteringArcs(fsa, &entering_arcs); | ||
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| const auto &ranges = entering_arcs.ranges; | ||
| const auto &values = entering_arcs.values; | ||
| EXPECT_EQ(ranges.size(), 4u); // there are 4 states | ||
| EXPECT_EQ(values.size(), 5u); // there are 5 arcs | ||
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| // state 0, no entering arcs | ||
| EXPECT_EQ(ranges[0].begin, ranges[0].end); | ||
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| // state 1 has one entering arc from state 0 with label 2 | ||
| EXPECT_EQ(ranges[1].begin, 0); | ||
| EXPECT_EQ(ranges[1].end, 1); | ||
| EXPECT_EQ(values[0].first, 2); // label is 2 | ||
| EXPECT_EQ(values[0].second, 0); // state is 0 | ||
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| // state 2 has two entering arcs | ||
| // the first one: from state 0 with label 1 | ||
| // the second one: from state 1 with label 0 | ||
| EXPECT_EQ(ranges[2].begin, 1); | ||
| EXPECT_EQ(ranges[2].end, 3); | ||
| EXPECT_EQ(values[1].first, 1); // label is 1 | ||
| EXPECT_EQ(values[1].second, 0); // state is 0 | ||
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| EXPECT_EQ(values[2].first, 0); // label is 0 | ||
| EXPECT_EQ(values[2].second, 1); // state is 1 | ||
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| // state 3 has two entering arcs | ||
| // the first one: from state 1 with label 5 | ||
| // the second one: from state 2 with label 6 | ||
| EXPECT_EQ(ranges[3].begin, 3); | ||
| EXPECT_EQ(ranges[3].end, 5); | ||
| EXPECT_EQ(values[3].first, 5); // label is 5 | ||
| EXPECT_EQ(values[3].second, 1); // state is 1 | ||
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| EXPECT_EQ(values[4].first, 6); // label is 6 | ||
| EXPECT_EQ(values[4].second, 2); // state is 2 | ||
| } | ||
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| } // namespace k2 |
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